LM96063
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SNIS149B – NOVEMBER 2011 – REVISED MARCH 2013
LM96063 Remote Diode Digital Temperature Sensor with Integrated Fan Control
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FEATURES
APPLICATIONS
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2
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Accurately Senses Remote Diode-Connected
MMBT3904 Transistors or Thermal Diodes OnBoard Processors, FPGAs or ASICs
Accurately Senses Its Own Local Die
Temperature
Offset Register can Adjust for a Variety of
Thermal Diodes
Resolves Remote Temperatures up to
255.875°C
10-bit Plus Sign and 11-bit Unsigned Data
Formats, with 1/8°C Resolution
Digital Filter of Remote Data Lowers Noise and
Improves Resolution to 1/32°C
Integrated PWM Fan Speed Control Output
Supports High Resolution at 22.5kHz
Frequency for 4-Pin Fans
Acoustic Fan Noise Reduction with UserProgrammable 12-Step Lookup Table
LUT Transition Fine Resolution Smoothing
Function
Tachometer Input for Measuring Fan RPM with
Smart-Tach Modes for Measuring RPM of Fans
when Pulse-Width-Modulating an Actual Power
ALERT Output for Error Event Notification
TCRIT Output for Critical Temperature System
Shutdown
SMBus 2.0 Compatible Interface, Supports
TIMEOUT
WSON Packages
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Communications Infrastructure FPGA, ASIC or
Processor Thermal Management
Electronic Test and Office Equipment
Industrial Controls
DESCRIPTION
The LM96063 is remote diode temperature sensors
with integrated fan control that includes remote diode
sensing. The LM96063 accurately measures: (1) its
own temperature and (2) the temperature of a diodeconnected transistor, such as a 2N3904, or a thermal
diode commonly found on Computer Processors,
Graphics Processor Units (GPU) and other ASIC's.
The LM96063 also features an integrated, pulsewidth-modulated (PWM), open-drain fan control
output. Fan speed is a combination of the remote
temperature reading, the lookup table and register
settings. The 12-step Lookup Table (LUT) enables
the user to program a non-linear fan speed vs.
temperature transfer function often used to quiet
acoustic fan noise. In addition a fully programmable
ramping function has been added to allow smooth
transitions between LUT setpoints.
The LM96063 is targeted mainly for a transistor
MMBT3904 used as thermal diodes or thermal diodes
found in many FPGAs, ASICs, and processors on
SOI processes. The LM96163 is identical to the
LM96063 except the TruTherm BJT Beta
compensation is enabled at power up that is targeted
for thermal diodes found on popular processors using
bulk non SOI processes.
Table 1. KEY SPECIFICATIONS
Supply Voltage
3.0 V to 3.6 V
Supply Current (0.8Hz Conversion)
456 µA (typ)
Remote Diode Temp Accuracy (TruTherm off, includes quantization error)
Ambient
Temp
Diode
Temp
Max
Error
+25 to +85°C
+50 to +105°C
±0.75°C
+25 to +85°C
+40 to +105°C
±1.5°C
-40 to +25°C
+25 to +125°C
±3°C
Local Temp Accuracy (includes quantization error)
AmbientTemp
MaxError
+25°C to +125°C
±3.0°C
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011–2013, Texas Instruments Incorporated
LM96063
SNIS149B – NOVEMBER 2011 – REVISED MARCH 2013
www.ti.com
Connection Diagram
TCRIT
VDD
D+
DPWM
1
10
2
9
3
8
LM96063
4
7
5
6
SMBCLK
SMBDAT
TACH
ALERT
GND
Figure 1. WSON Package
See Package Number DSC0010A
PIN DESCRIPTIONS
2
Pin
Name
Input/Output
Function and Connection
1
TCRIT
Open-Drain
Digital Output
2
VDD
Power Supply Input
3
D+
Analog Input
Connect to the anode (positive side) of the remote diode. A 100pF capacitor can be
connected between pins 3 and 4.
4
D−
Analog Input
Connect to the cathode (negative side) of the remote diode. A 100pF capacitor can be
connected between pins 3 and 4.
5
PWM
Open-Drain
Digital Output
Open-Drain Digital Output. Connect to fan drive circuitry. The power-on default for this
pin is low (pin 4 pulled to ground).
6
GND
Ground
7
ALERT
Open-Drain
Digital Output
8
TACH
Digital Input
9
SMBDAT
Digital Input/
Open-Drain Digital
Output
10
SMBCLK
Digital Input
Open-Drain Digital Output. Connect to system shutdown. Pin activates when
temperature conversion value exceeds programmed limit. Several power-on-default
limit values are available.
Connect to a low-noise +3.3 ± 0.3 VDC power supply, and bypass to GND with a 0.1 µF
ceramic capacitor in parallel with a 100 pF ceramic capacitor. A bulk capacitance of 10
µF needs to be in the vicinity of the LM96063's VDD pin.
This is the analog and digital ground return.
This pin is an open-drain ALERT output.
Tachometer input for measuring fan speed. Note the TACH input is disabled upon
power-up and needs to be enabled for use by setting TCHEN bit 2 of Configuration
Register 03h.
This is the bidirectional SMBus data line.
Digital Input. This is the SMBus clock input.
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Simplified Block Diagram
Internal Diode
LM96063-LLP10
D+
Traditional
Diode
Bias and
Control
D-
Analog
Filter
IIR
Filter
'6 ADC
Tachometer
Detection
SMBDAT
Temp Reading,
Temp Limit,
Hysteresis, and
Temp Sensor
Filter Registers
2 - Wire
Serial
Interface
SMBCLK
TACH
TCRIT
Comparators
ALERT
Status and Status Mask Registers and
Logic
PWM
PWM Fan Control
Registers
PWM Fan
Control
Typical Application
+3.3V
0.1
These two capacitors
are close to Pin 2
10 PF
Fan voltage
+12 or +5 VDC
+3.3V
Fan V+
100 pF
LM96063
OPTIONAL
Capacitor is close
to pins 3 and 4
4-Pin DC Brushless
Fan Module with
Tachometer Output
and PWM Input
2
3
VDD
SMBCLK
D+
SMBDAT
1.2k
1.2k
To SMBus
interface
control
circuitry
10
9
100 pF
4
5
DPWM
TACH
GND
8
6
1k
13k
Tach In
10k
Tach. input
from Fan
+3.3V
Remote diodeconnected transistor
inside of a CPU, GPU,
ASIC or descrete
MMBT3904
1.2k
PWM Output
to Fan
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These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings
(1) (2)
−0.3 V to 6.0 V
Supply Voltage, VDD
Voltage on SMBDAT, SMBCLK,
TCRIT, TACH PWM Pins
ALERT,
−0.5 V to 6.0 V
−0.3 V to (VDD + 0. 3 V)
Voltage on Other Pins
Input Current, D− Pin (3)
±1 mA
Input Current at All Other Pins
Package Input Current
(3)
5 mA
(3)
30 mA
SMBDAT, ALERT, PWM pins
Output Sink Current
10 mA
(4)
Package Power Dissipation
Junction Temperature
125°C
Storage Temperature
−65°C to +150°C
ESD Susceptibility (5)
Human Body Model
2500 V
Machine Model
250 V
Charged Device Model
(1)
(2)
(3)
(4)
(5)
1000 V
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not ensure performance limits. For ensured specifications and test conditions, see the Electrical
Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may degrade
when the device is not operated under the listed test conditions.
All voltages are measured with respect to GND, unless otherwise noted.
When the input voltage (VIN) at any pin exceeds the power supplies (VIN < GND or VIN > V+), the current at that pin should be limited to
5 mA. Parasitic components and/or ESD protection circuitry are shown below for the LM96063's pins. Care should be taken not to
forward bias the parasitic diode, D2, present on pins D+ and D−. Doing so by more than 50 mV may corrupt temperature
measurements.
Thermal resistance junction to ambient when attached to a 2 layer 4"x3" printed circuit board with copper thickness of 2oz. as described
in JEDEC specification EIA/JESD51-3 is 137°C/W. Thermal resistance junction to ambient when attached to a 4 layer 4"x3" printed
circuit board with copper thickness 2oz./1oz./1oz/2oz. and 4 thermal vias as described in JEDEC specification EIA/JESD51-7 is
40.3°C/W.
Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin. Charged
Device Model (CDM) simulates a pin slowly acquiring charge (such as from a device sliding down the feeder in an automated
assembler) then rapidly being discharged.
Operating Ratings
(1) (2) (3) (4)
TMIN ≤ TA ≤ TMAX
Specified Temperature Range
–40°C ≤ TA ≤ +85°C
LM96063CISD
-40°C ≤ TD ≤ +140°C
Remote Diode Temperature Range
Supply Voltage Range (VDD)
(1)
(2)
(3)
(4)
4
+3.0 V to +3.6 V
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not ensure performance limits. For ensured specifications and test conditions, see the Electrical
Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may degrade
when the device is not operated under the listed test conditions.
All voltages are measured with respect to GND, unless otherwise noted.
Soldering process must comply with Reflow Temperature Profile specifications. Refer to www.ti.com/packaging.
Reflow temperature profiles are different for packages containing lead (Pb) than for those that do not.
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DC Electrical Characteristics
TEMPERATURE-TO-DIGITAL CONVERTER CHARACTERISTICS
The following specifications apply for VDD = 3.0 VDC to 3.6 VDC, and all analog source impedance RS = 50Ω unless
otherwise specified in the conditions. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = +25°C; unless
otherwise noted. TD is the junction temperature of the remote thermal diode. TJ is the junction temperature of the LM96063.
Parameter
Test Conditions
Temperature Error Using an MMBT3904
Remote Thermal Diode
Temperature Error Using the Local Diode
(3)
Typical
(1)
Units
(Limits)
TD = +50°C to +105°C
TD = Remote Diode
Junction Temperature
±0.75
°C (max)
TA = +25°C to +85°C
TD = +40°C to +125°C
±1.5
°C (max)
TA = -40°C to +25°C
TD = +25°C to +125°C
±3.0
°C (max)
±3
°C (max)
±6
°C (max)
TA = +25°C to +125°C
±1
Remote Diode Resolution
11
Bits
0.125
°C
8
Bits
Local Diode Resolution
1
Conversion Time, All Temperature Channels
Fastest Setting
38.3
D− Source Voltage
°C
41.1
ms (max)
225
µA (max)
100
µA (min)
0.4
(VD+ − VD−) = +0.65 V; High Current
Diode Source Current
Low Current
172
V
10.75
Diode Source Current Ratio
(2)
(3)
(2)
TA = +25°C to +85°C
TA = -40°C to +25°C
(1)
Limits
µA
16
“Typicals” are at TA = 25°C and represent most likely parametric norm. They are to be used as general reference values not for critical
design calculations.
Limits are specified to AOQL (Average Outgoing Quality Level).
Local temperature accuracy does not include the effects of self-heating. The rise in temperature due to self-heating is the product of the
internal power dissipation of the LM96063 and the thermal resistance. See Note 4 in the Absolute Maximum Ratings table for the
thermal resistance to be used in the self-heating calculation.
Operating Electrical Characteristics
Parameter
VPOR
IS
(1)
(2)
(3)
Test Conditions
Typ
(1)
Power-On-Reset Threshold Voltage
Supply Current
(3)
Limits
(2)
Units
2.8
V (max)
1.6
V (min)
SMBus Inactive, 13 Hz
Conversion Rate
1.1
1.6
mA (max)
SMBus Inactive, 0.8 Hz
Conversion Rate
456
825
µA (max)
STANDBY Mode
416
700
µA (max)
“Typicals” are at TA = 25°C and represent most likely parametric norm. They are to be used as general reference values not for critical
design calculations.
Limits are specified to AOQL (Average Outgoing Quality Level).
The supply current will not increase substantially with an SMBus transaction.
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AC Electrical Characteristics
The following specifications apply for VDD = 3.0 VDC to 3.6 VDC, and all analog source impedance RS = 50Ω unless
otherwise specified in the conditions. Boldface limits apply for TA = TMIN to TMAX; all other limits TA= +25°C.
Limits
(2)
Units
(Limit)
Fan Count Accuracy
±7
% (max)
Fan Full-Scale Count
65535
(max)
Parameter
Test Conditions
Typical
(1)
TACHOMETER ACCURACY
Fan Counter Clock Frequency
90
kHz
Fan Count Update Frequency
1.0
Hz
FAN PWM OUTPUT
Frequency Accuracy
(1)
(2)
±7
% (max)
“Typicals” are at TA = 25°C and represent most likely parametric norm. They are to be used as general reference values not for critical
design calculations.
Limits are specified to AOQL (Average Outgoing Quality Level).
Digital Electrical Characteristics
Parameter
(2)
Typical
Limits
(1)
(2)
Units
(Limit)
VIH
Logical High Input Voltage
2.1
V (min)
VIL
Logical Low Input Voltage
0.8
V (max)
IIH
Logical High Input Current
VIN = VDD
0.005
+10
µA (max)
IIL
Logical Low Input Current
VIN = GND
−0.005
−10
µA (max)
CIN
Digital Input Capacitance
VOL
ALERT, TCRIT and PWM Output
Saturation Voltage
COUT
(1)
Test Conditions
5
pF
IOUT = 6 mA
0.4
Digital Output Capacitance
V (max)
5
pF
“Typicals” are at TA = 25°C and represent most likely parametric norm. They are to be used as general reference values not for critical
design calculations.
Limits are specified to AOQL (Average Outgoing Quality Level).
SMBus Logical Electrical Characteristics
The following specifications apply for VDD = 3.0 VDC to 3.6 VDC, and all analog source impedance RS = 50Ω unless
otherwise specified in the conditions. Boldface limits apply for TA = TMIN to TMAX; all other limits TA = +25°C.
Parameter
Test Conditions
Typical
(1)
Limits
(2)
Units
(Limit)
SMBDAT OPEN-DRAIN OUTPUT
VOL
Logic Low Level Output Voltage
IOL = 4 mA
IOH
High Level Output Current
VOUT = VDD
COUT
Digital Output Capacitance
0.03
0.4
V (max)
10
µA (max)
5
pF
SMBDAT, SMBCLK INPUTS
VIH
Logical High Input Voltage
2.1
V (min)
VIL
Logical Low Input Voltage
0.8
V (max)
VHYST
CIN
(1)
(2)
6
Logic Input Hysteresis Voltage
Digital Input Capacitance
320
mV
5
pF
“Typicals” are at TA = 25°C and represent most likely parametric norm. They are to be used as general reference values not for critical
design calculations.
Limits are specified to AOQL (Average Outgoing Quality Level).
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SMBus Digital Switching Characteristics
Unless otherwise noted, these specifications apply for VDD = +3.0 VDC to +3.6 VDC, CL (load capacitance) on output lines =
80 pF. Boldface limits apply for TA = TJ; TMIN ≤ TA ≤ TMAX; all other limits TA = TJ = +25°C, unless otherwise noted. The
switching characteristics of the LM96063 fully meet or exceed the published specifications of the SMBus version 2.0. The
following parameters are the timing relationships between SMBCLK and SMBDAT signals related to the LM96063. They
adhere to but are not necessarily the same as the SMBus bus specifications.
Parameter
Test Conditions
Limits
(1)
Units
(Limit)
10
100
kHz (min)
kHz (max)
fSMB
SMBus Clock Frequency
tLOW
SMBus Clock Low Time
From VIN(0) max to VIN(0) max
4.7
µs (min)
tHIGH
SMBus Clock High Time
From VIN(1) min to VIN(1) min
4.0
50
µs (min)
µs (max)
tR
SMBus Rise Time
(2)
1
µs (max)
tF
SMBus Fall Time
(3)
0.3
µs (max)
tOF
Output Fall Time
250
ns (max)
tTIMEOUT
SMBDAT and SMBCLK Time Low for Reset of
Serial Interface See (4)
25
35
ms (min)
ms (max)
tSU:DAT
Data In Setup Time to SMBCLK High
250
ns (min)
tHD:DAT
Data Out Hold Time after SMBCLK Low
300
1075
ns (min)
ns (max)
tHD:STA
Hold Time after (Repeated) Start Condition. After
this period the first clock is generated.
4.0
µs (min)
tSU:STO
Stop Condition SMBCLK High to SMBDAT Low
(Stop Condition Setup)
100
ns (min)
tSU:STA
SMBus Repeated Start-Condition Setup Time,
SMBCLK High to SMBDAT Low
4.7
µs (min)
tBUF
SMBus Free Time between Stop and Start
Conditions
4.7
µs (min)
(1)
(2)
(3)
(4)
CL = 400 pF, IO = 3 mA
Limits are specified to AOQL (Average Outgoing Quality Level).
The output rise time is measured from (VIL max - 0.15 V) to (VIH min + 0.15 V).
The output fall time is measured from (VIH min + 0.15 V) to (VIL max - 0.15 V).
Holding the SMBDAT and/or SMBCLK lines Low for a time interval greater than tTIMEOUT will reset the LM96063’s SMBus state machine,
therefore setting SMBDAT and SMBCLK pins to a high impedance state.
tLOW
tR
tF
VIH
SMBCLK
VIL
tHD;STA
tHD;DAT
tBUF
tHIGH
tSU;STA
tSU;DAT
tSU;STO
VIH
SMBDAT
VIL
P
S
S
P
Figure 2. SMBus Timing Diagram for SMBCLK and SMBDAT Signals
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Pin #
Label
Circuit
1
TCRIT
A
2
VDD
B
3
D+
B
4
D-
B
5
PWM
A
6
GND
B
7
ALERT
A
8
TACH
A
9
SMBDAT
A
10
SMBCLK
A
Pin ESD Protection Structure Circuits
PIN
D1
SNP
GND
CIRCUIT A
V+
D2
PIN
D1
D3
6.5V
GND
ESD
CLAMP
CIRCUIT B
Typical Performance Characteristics
Remote Temperature Reading Sensitivity to Thermal
Diode Filter Capacitance
Thermal Diode Capacitor or PCB Leakage Current Effect
on Remote Diode Temperature Reading
Figure 3.
Figure 4.
Conversion Rate Effect on
Average Power Supply Current
2600
SUPPLY CURRENT (PA
2300
2000
1700
1400
1100
800
500
200
0.01
0.1
1.0
10
100
CONVERSION RATE (Hz)
Figure 5.
8
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FUNCTIONAL DESCRIPTION
The LM96063 Remote Diode Temperature Sensor with Integrated Fan Control incorporates a ΔVBE-based
temperature sensor utilizing a Local or Remote diode and a 10-bit plus sign ΔΣ ADC (Delta-Sigma Analog-toDigital Converter). The pulse-width modulated (PWM) open-drain output, with a pull-up resistor, is driven by a 12point temperature to duty cycle look-up table (LUT) and can directly drive a PWM input of a 4-pin fan in order to
modulate it's speed enabling optimum system acoustic performance. The LM96063 LUT fan control algorithm
also includes a smoothing function that allows the PWM duty cycle to gradually change over a programmed time
interval when switching from one level to the next in the LUT. When running at a frequency of 22.5kHz the PWM
output resolution is 0.39%. The LM96063 includes a TACH input that can measure the speed of a fan using the
pulses from a 3 or 4 pin fan’s tachometer output. The LM96063 includes a smart-tach measurement mode to
accommodate the corrupted tachometer pulses when using switching transistor power drive to modulate the fan
speed. The LM96063 has an ALERT open-drain output that will be pulled low when the measured temperature
exceeds certain programmed limits when enabled. Details are contained in the sections below.
The LM96063 can measure a diode-connected transistor such as the MMBT3904 or the thermal diode found in
an FPGA, ASIC, Processor or any other device built on an SOI process accurately. The LM96163 is identical to
the LM96063 except the TruTherm BJT Beta compensation is included. Thermal diode TruTherm BJT
compensation circuitry is required when sensing thermal diodes mainly found in 22/45/65/90 nm conventional
bulk CMOS non SOI processes.
The LM96063's two-wire interface is compatible with the SMBus Specification 2.0. For more information the
reader is directed to www.smbus.org.
In the LM96063 digital comparators are used to compare the measured Local Temperature (LT) to the Local
High Setpoint user-programmable temperature limit register. The measured Remote Temperature (RT) is digitally
compared to the Remote High Setpoint (RHS), the Remote Low Setpoint (RLS), and the Remote T_CRIT
Setpoint (RCS) user-programmable temperature limits. An ALERT output will occur when the measured
temperature is: (1) higher than either the High Setpoint or the T_CRIT Setpoint, or (2) lower than the Low
Setpoint. The ALERT Mask register allows the user to prevent the generation of these ALERT outputs. A TCRIT
output will occur when the measured temperature is higher than the T_CRIT Setpoint.
The TCRIT function and the look-up table temperature hysteresis can be set separately. The hysteresis value
associated with the TCRIT output is set in the Remote T_CRIT Hysteresis Register. The value associated with
the look-up table function is set in the Lookup Table Hysteresis Register.
The LM96063 may be placed in a low power Standby mode by setting the Standby bit found in the Configuration
Register. In the Standby mode continuous conversions are stopped. In Standby mode the user may choose to
allow the PWM output signal to continue, or not, by programming the PWM Disable in Standby bit in the
Configuration Register.
The Local Temperature reading and setpoint data registers are 8-bits wide. The format of the 11-bit remote
temperature data is a 16-bit left justified word. Two 8-bit registers, high and low bytes, are provided for each
setpoint as well as the temperature reading. A digital filter may be invoked for remote temperature readings that
increases the resolution from 11-bits to 13-bits. The temperature readings are also available in an unsigned
format allowing resolution above 127°C. Two Remote Temperature Offset (RTO) Registers: High Byte and Low
Byte (RTOHB and RTOLB) may be used to correct the temperature readings by adding or subtracting a fixed
value based on a different non-ideality factor and series resistance of the thermal diode if different from the
thermal diode found in the Intel processors on 45 nm process. See section DIODE NON-IDEALITY.
ALERT and TCRIT OUTPUTS
In this section we will address the ALERT and TCRIT active-low open-drain output functions. When the ALERT
Mask bit in the Configuration register is written as zero the ALERT interrupts are enabled.
The LM96063's ALERT pin is versatile and can produce three different methods of use to best serve the system
designer: (1) as a temperature comparator (2) as a temperature-based interrupt flag, and (3) as part of an
SMBus ALERT System. The three methods of use are further described below. The ALERT and interrupt
methods are different only in how the user interacts with the LM96063.
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The remote temperature (RT) reading is associated with a T_CRIT Setpoint Register, and both local and remote
temperature (LT and RT) readings are associated with a HIGH setpoint register (LHS and RHS). The RT is also
associated with a LOW setpoint register (RLS). At the end of every temperature reading a digital comparison
determines whether that reading is above its HIGH or T_CRIT setpoint or below its LOW setpoint. If so, the
corresponding bit in the ALERT Status Register is set. If the ALERT mask bit is low, any bit set in the ALERT
Status Register, with the exception of Busy or RDFA, will cause the ALERT output to be pulled low. Any
temperature conversion that is out of the limits defined in the temperature setpoint registers will trigger an
ALERT. Additionally, the ALERT Mask Bit must be cleared to trigger an ALERT in all modes.
The format of the Remote High limit and T_CRIT limit comparison is programmable. The USF bit found in the
Enhanced Configuration register controls whether comparisons use a signed or unsigned format. The
temperature format used for Remote High and T_CRIT limit comparisons is +255.875 °C to -256 °C.
The three different ALERT modes and TCRIT function will be discussed in the following sections.
ALERT Output as a Temperature Comparator
When the LM96063 is used in a system in which does not require temperature-based interrupts, the ALERT
output could be used as a temperature comparator. In this mode, once the condition that triggered the ALERT to
go low is no longer present, the ALERT is negated (Figure 6). For example, if the ALERT output was activated
by the comparison of LT > LHS, when this condition is no longer true, the ALERT will return HIGH. This mode
allows operation without software intervention, once all registers are configured during set-up. In order for the
ALERT to be used as a temperature comparator, the Comparator Mode bit in the Remote Diode Temperature
Filter and Comparator Mode Register must be asserted. This is not the power-on default state.
Temperature
Remote High Limit
RDTS Measurement
Voltage
LM96063 ALERT Pin
Status Register: RTDS High
Time
Figure 6. ALERT Output as Temperature Comparator Response Diagram
ALERT Output as an Interrupt
The LM96063's ALERT output can be implemented as a simple interrupt signal when it is used to trigger an
interrupt service routine. In such systems it is desirable for the interrupt flag to repeatedly trigger during or before
the interrupt service routine has been completed. Under this method of operation, during the read of the ALERT
Status Register the LM96063 will set the ALERT Mask bit in the Configuration Register if any bit in the ALERT
Status Register is set, with the exception of Busy and RDFA. This prevents further ALERT triggering until the
master has reset the ALERT Mask bit, at the end of the interrupt service routine. The ALERT Status Register bits
are cleared only upon a read command from the master (see Figure 7 ) and will be re-asserted at the end of the
next conversion if the triggering condition(s) persist(s). In order for the ALERT to be used as a dedicated
interrupt signal, the Comparator Mode bit in the Remote Diode Temperature Filter and Comparator Mode
Register must be set low. This is the power-on default state. The following sequence describes the response of a
system that uses the ALERT output pin as an interrupt flag:
1. Master senses ALERT low.
2. Master reads the LM96063 ALERT Status Register to determine what caused the ALERT.
3. LM96063 clears ALERT Status Register, resets the ALERT HIGH and sets the ALERT Mask bit in the
Configuration Register.
4. Master attends to conditions that caused the ALERT to be triggered. The fan is started, setpoint limits are
adjusted, etc.
5. Master resets the ALERT Mask bit in the Configuration Register.
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Voltage
Temperature
Remote High Limit
LM96063
ALERT pin
RDTS Measurement
ALERT mask set in
response to reading of
status register by master
End of Temperature
conversion
Status Register: RTDS High
Time
Figure 7. ALERT Output as an Interrupt Temperature Response Diagram
ALERT Output as an SMBus ALERT
An SMBus alert line is created when the ALERT output is connected to: (1) one or more ALERT outputs of other
SMBus compatible devices, and (2) to a master. Under this implementation, the LM96063's ALERT should be
operated using the ARA (Alert Response Address) protocol. The SMBus 2.0 ARA protocol, defined in the SMBus
specification 2.0, is a procedure designed to assist the master in determining which part generated an interrupt
and to service that interrupt.
The SMBus alert line is connected to the open-drain ports of all devices on the bus, thereby AND'ing them
together. The ARA method allows the SMBus master, with one command, to identify which part is pulling the
SMBus alert line LOW. It also prevents the part from pulling the line LOW again for the same triggering condition.
When an ARA command is received by all devices on the bus, the devices pulling the SMBus alert line LOW: (1)
send their address to the master and (2) release the SMBus alert line after acknowledgement of their address.
The SMBus Specifications 1.1 and 2.0 state that in response to and ARA (Alert Response Address) “after
acknowledging the slave address the device must disengage its ALERT pulldown”. Furthermore, “if the host still
sees ALERT low when the message transfer is complete, it knows to read the ARA again.” This SMBus
“disengaging ALERT requirement prevents locking up the SMBus alert line. Competitive parts may address the
“disengaging of ALERT” differently than the LM96063 or not at all. SMBus systems that implement the ARA
protocol as suggested for the LM96063 will be fully compatible with all competitive parts.
The LM96063 fulfills “disengaging of ALERT” by setting the ALERT Mask Bit in the Configuration Register after
sending out its address in response to an ARA and releasing the ALERT output pin. Once the ALERT Mask bit is
activated, the ALERT output pin will be disabled until enabled by software. In order to enable the ALERT the
master must read the ALERT Status Register, during the interrupt service routine and then reset the ALERT
Mask bit in the Configuration Register to 0 at the end of the interrupt service routine.
The following sequence describes the ARA response protocol.
1. Master senses SMBus alert line low
2. Master sends a START followed by the Alert Response Address (ARA) with a Read Command.
3. Alerting Device(s) send ACK.
4. Alerting Device(s) send their address. While transmitting their address, alerting devices sense whether their
address has been transmitted correctly. (The LM96063 will reset its ALERT output and set the ALERT Mask
bit once its complete address has been transmitted successfully.)
5. Master/slave NoACK
6. Master sends STOP
7. Master attends to conditions that caused the ALERT to be triggered. The ALERT Status Register is read and
fan started, setpoints adjusted, etc.
8. Master resets the ALERT Mask bit in the Configuration Register.
The ARA, 000 1100, is a general call address. No device should ever be assigned to this address.
The ALERT Configuration bit in the Remote Diode Temperature Filter and Comparator Mode Register must be
set low in order for the LM96063 to respond to the ARA command.
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The ALERT output can be disabled by setting the ALERT Mask bit in the Configuration Register. The power-on
default is to have the ALERT Mask bit and the ALERT Configuration bit low.
Temperature
Remote High Limit
RDTS Measurement
ALERT mask set
in response to
ARA from master
Voltage
LM96063
ALERT Pin
Status Register: Remote High
Time
Figure 8. ALERT Output as an SMBus ALERT Temperature Response Diagram
TCRIT Function
The TCRIT output will be activated whenever the RCRIT bit in the ALERT Status register is set. This occurs
whenever the remote temperature exceeds the value set by the Remote T_CRIT Setpoint register. There is a
hysteresis associated with the T_CRIT Setpoint that is set by the value in the Remote T_CRIT Hysteresis
register. The RCRIT bit will be reset when the remote temperature equals or is less than the value defined by
Remote T_CRIT Setpoint minus T_CRIT Hysteresis. The resolution of the comparison is 1 °C. For example if
T_CRIT = 110 °C and THYST = 5 °C the TCRIT output will activate when the temperature reading is 111 °C and
deactivate when the temperature reading is 105 °C.
When the LM96063 powers up the T_CRIT limit is locked to the default value. It may be changed after the
T_CRIT Limit Override bit (TCRITOV) bit, found in the Configuration Register, is set.
The format of the Remote T_CRIT setpoint register is controlled by the USF bit found in the Enhanced
configuration register. The temperature reading format used for the T_CRIT comparisons is +255 °C to -256°C.
SMBus INTERFACE
Since the LM96063 operates as a slave on the SMBus the SMBCLK line is an input and the SMBDAT line is
bidirectional. The LM96063 never drives the SMBCLK line and it does not support clock stretching. According to
SMBus specifications, the LM96063 has a 7-bit slave address. All bits, A6 through A0, are internally programmed
and cannot be changed by software or hardware.
The complete slave address is:
A6
A5
A4
A3
A2
A1
A0
1
0
0
1
1
0
0
POWER-ON RESET (POR) DEFAULT STATES
For information on the POR default states see LM96063 REGISTER MAP IN FUNCTIONAL ORDER.
TEMPERATURE DATA FORMAT
Temperature data can only be read from the Local and Remote Temperature value registers. The data format for
all temperature values is left justified 16-bit word available in two 8-bit registers. Unused bits will always report
"0". All temperature data is clamped and will not roll over when a temperature exceeds full-scale value.
Remote temperature and remote high setpoint temperature data can be represented by an 11-bit, two's
complement word or unsigned binary word with an LSb (Least Significant Bit) equal to 0.125°C.
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Table 2. 11-bit, 2's complement (10-bit plus sign)
Digital Data
Temperature
Binary
Hex
+125°C
0111 1101 0000 0000
7D00h
+25°C
0001 1001 0000 0000
1900h
+1°C
0000 0001 0000 0000
0100h
+0.125°C
0000 0000 0010 0000
0020h
0°C
0000 0000 0000 0000
0000h
−0.125°C
1111 1111 1110 0000
FFE0h
−1°C
1111 1111 0000 0000
FF00h
−25°C
1110 0111 0000 0000
E700h
−55°C
1100 1001 0000 0000
C900h
Table 3. 11-bit, unsigned binary
Digital Data
Temperature
Binary
Hex
+255.875°C
1111 1111 1110 0000
FFE0h
+255°C
1111 1111 0000 0000
FF00h
+201°C
1100 1001 0000 0000
C900h
+125°C
0111 1101 0000 0000
7D00h
+25°C
0001 1001 0000 0000
1900h
+1°C
0000 0001 0000 0000
0100h
+0.125°C
0000 0000 0010 0000
0020h
0°C
0000 0000 0000 0000
0000h
When the digital filter is enabled on the remote channel, temperature data is represented by a 13-bit unsigned
binary or 12-bit plus sign (two's complement) word with an LSb equal to 0.03125°C.
Table 4. 13-bit, 2's complement (12-bit plus sign)
Digital Data
Temperature
Binary
Hex
+125°C
0111 1101 0000 0000
7D00h
+25°C
0001 1001 0000 0000
1900h
+1°C
0000 0001 0000 0000
0100h
+0.03125°C
0000 0000 0000 1000
0008h
0°C
0000 0000 0000 0000
0000h
−0.03125°C
1111 1111 1111 1000
FFF8h
FF00h
−1°C
1111 1111 0000 0000
−25°C
1110 0111 0000 0000
E700h
−55°C
1100 1001 0000 0000
C900h
Table 5. 13-bit, unsigned binary
Temperature
Digital Data
Binary
Hex
+255.875°C
1111 1111 1110 0000
FFE0h
+255°C
1111 1111 0000 0000
FF00h
+201°C
1100 1001 0000 0000
C900h
+125°C
0111 1101 0000 0000
7D00h
+25°C
0001 1001 0000 0000
1900h
+1°C
0000 0001 0000 0000
0100h
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Table 5. 13-bit, unsigned binary (continued)
Digital Data
Temperature
Binary
Hex
+0.03125°C
0000 0000 0000 1000
0008h
0°C
0000 0000 0000 0000
0000h
Local Temperature and Remote T_CRIT setpoint data is represented by an 8-bit, two's complement, word with
an LSb equal to 1°C.
Table 6. 8-bit, 2's complement (7-bit plus sign)
Temperature
Digital Data
Binary
Hex
+125°C
0111 1101
7Dh
+25°C
0001 1001
19h
+1°C
0000 0001
01h
0°C
0000 0000
00h
−1°C
1111 1111
FFh
−25°C
1110 0111
E7h
−55°C
1100 1001
C9h
Remote T_CRIT setpoint data can also be represented by an 8-bit, unsigned, word with an LSb equal to 1°C.
Table 7. 8-bit, unsigned binary
Temperature
Digital Data
Binary
Hex
+255°C
1111 1111
FFh
+150°C
1001 0110
96h
+125°C
0111 1101
7Dh
+25°C
0001 1001
19h
+1°C
0000 0001
01h
0°C
0000 0000
00h
OPEN-DRAIN OUTPUTS
The SMBDAT, ALERT, TCRIT and PWM outputs are open-drain outputs and do not have internal pull-ups. A
“High” level will not be observed on these pins until pull-up current is provided by an internal source, typically
through a pull-up resistor. Choice of resistor value depends on several factors but, in general, the value should
be as high as possible consistent with reliable operation. This will lower the power dissipation of the LM96063
and avoid temperature errors caused by self-heating of the device. The maximum value of the pull-up resistor to
provide the 2.1 V high level is 88.7 kΩ.
DIODE FAULT DETECTION
The LM96063 is equipped with operational circuitry designed to detect remote diode fault conditions:
• D+ shorted to VDD
• D+ open or floating
• D+ shorted to GND.
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In the event that the D+ pin is grounded the Remote Temperature reading is forced to –128.000 °C if signed
format is read and 0 °C if unsigned format is read. When the D+ pin is detected as shorted to VDD or floating, the
Remote Temperature reading is forced to +127.000 °C if signed format is read and +255.000 °C is unsigned
format is read. In addition, the ALERT Status register bit RDFA is set. Setting of the RDFA bit will not cause
ALERT or TCRIT to activate. Under fault conditions remote diode setpoint comparisons will use these forced
temperature values therefore other bits in the ALERT Status Register may be set thus activating the ALERT or
TCRIT outputs unless these bits are masked. The function of the ALERT and TCRIT is fully described ALERT
and TCRIT OUTPUTS.
COMMUNICATING WITH THE LM96063
Each data register in the LM96063 falls into one of four types of user accessibility:
1. Read Only
2. Write Only
3. Read/Write same address
4. Read/Write different address
A Write to the LM96063 is comprised of an address byte and a command byte. A write to any register requires
one data byte.
Reading the LM96063 Registers can take place after the requisite register setup sequence takes place. See
LM96063 REQUIRED INITIAL FAN CONTROL REGISTER SEQUENCE.
The data byte has the Most Significant Bit (MSB) first. At the end of a read, the LM96063 can accept either
Acknowledge or No-Acknowledge from the Master. Note that the No-Acknowledge is typically used as a signal
for the slave indicating that the Master has read its last byte.
DIGITAL FILTER
In order to suppress erroneous remote temperature readings due to noise as well as increase the resolution of
the temperature, the LM96063 incorporates a digital filter for remote temperature readings. The filter is accessed
in the Remote Diode Temperature Filter and Comparator Mode Register. The filter can be set according to the
following table.
RDTF[1:0]
Filter Setting
0
0
No Filter
0
1
Filter (equivalent to Level 2 filter of the LM86/LM89)
1
0
Reserved
1
1
Enhanced Filter (Filter with transient noise clipping)
Figure 9 describes the filter output in response to a step input and an impulse input.
a) Seventeen and fifty degree step
response
b) Impulse response with input
transients less than 4°C
c) Impulse response with input
transients great than 4°C
Figure 9. Filter Impulse and Step Response Curves
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45
LM96063
with
Filter Off
43
TEMPERATURE (°C)
41
39
37
35
LM96063
with Filter
On
33
31
29
27
25
0
50
100
150
200
SAMPLE NUMBER
Figure 10. Filter Curves were Purposely Offset for Clarity
Figure 10 shows the filter in use in a typical Intel processor on a 65/90 nm process system. Note that the two
curves have been purposely offset for clarity. Inserting the filter does not induce an offset as shown.
FAULT QUEUE
TEMPERATURE
The LM96063 incorporates a Fault Queue to suppress erroneous ALERT triggering. The Fault Queue prevents
false triggering by requiring three consecutive out-of-limit HIGH or LOW temperature readings. See Figure 11.
The Fault Queue defaults to OFF upon power-up and may be activated by setting the RDTS Fault Queue bit in
the Configuration Register to a 1.
RDTS Measurement
Status Register: RTDS High
n
n+1
n+2
n+3
n+4
n+5
SAMPLE NUMBER
Figure 11. Fault Queue Temperature Response Diagram
ONE-SHOT REGISTER
The One-Shot Register is used to initiate a single conversion and comparison cycle when the device is in
standby mode, after which the data returns to standby. This is not a data register. A write operation causes the
one-shot conversion. The data written to this address is irrelevant and is not stored. A zero will always be read
from this register.
SERIAL INTERFACE RESET
In the event that the SMBus Master is reset while the LM96063 is transmitting on the SMBDAT line, the
LM96063 must be returned to a known state in the communication protocol. This may be done in one of two
ways:
1. When SMBDAT is Low, the LM96063 SMBus state machine resets to the SMBus idle state if either SMBDAT
or SMBCLK are held Low for more than 35 ms (tTIMEOUT). Devices are to timeout when either the SMBCLK or
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SMBDAT lines are held Low for 25 ms – 35 ms. Therefore, to insure a timeout of devices on the bus, either
the SMBCLK or the SMBDAT line must be held Low for at least 35 ms.
2. With both SMBDAT and SMBCLK High, the master can initiate an SMBus start condition with a High to Low
transition on the SMBDAT line. The LM96063 will respond properly to an SMBus start condition at any point
during the communication. After the start the LM96063 will expect an SMBus Address address byte.
LM96063 Registers
The following pages include: LM96063 REGISTER MAP IN HEXADECIMAL ORDER, which shows a summary of
all registers and their bit assignments, LM96063 REGISTER MAP IN FUNCTIONAL ORDER, andLM96063
REQUIRED INITIAL FAN CONTROL REGISTER SEQUENCE. Do not address the unused or manufacturer’s
test registers.
LM96063 REGISTER MAP IN HEXADECIMAL ORDER
The following is a Register Map grouped in hexadecimal address order. Some address locations have been left
blank to maintain compatibility with LM86, LM63 and LM64. Addresses in parenthesis are mirrors of “Same As”
address for backwards compatibility with some older software. Reading or writing either address will access the
same 8-bit register.
Register
0x[HEX]
R/
W
POR
Val
00
R
–
01
R
02
Register Name
DATA BITS
D7
D6
D5
D4
D3
D2
D1
D0
Local Temperature
(Signed MSB)
LT7
SIGN
LT6
64
LT5
32
LT4
16
LT3
8
LT2
4
LT1
2
LT0
1
–
Rmt Temp MSB
RT12
SIGN
RT11
64
RT10
32
RT9
16
RT8
8
RT7
4
RT6
2
RT5
1
R
–
ALERT Status
BUSY
LHIGH
0
RHIGH
RLOW
RDFA
RCRIT
TACH
03
R/
W
00
Configuration
ALTMSK
STBY
PWMDIS
0
0
TCHEN
04
R/
W
08
Conversion Rate
0
0
0
0
CONV3
CONV2
CONV1
CONV0
05
R/
W
46
Local High Setpoint
LHS7
SIGN
LHS6
64
LHS5
32
LHS4
16
LHS3
8
LHS2
4
LHS1
2
LHS0
1
06
[Reserved]
TCRITOV FLTQUE
Not Used
07
R/
W
69
Rmt High Setpoint
MSB
RHS10
SIGN
/128
RHS9
64
RHS8
32
RHS7
16
RHS6
8
RHS5
4
RHS4
2
RHS3
1
08
R/
W
00
Rmt Low Setpoint
MSB
RLS10
SIGN
RLS9
64
RLS8
32
RLS7
16
RLS6
8
RLS5
4
RLS4
2
RLS3
1
(09)
R/
W
00
Same as 03
ALTMSK
STBY
PWMDIS
0
0
TCHEN
(0A)
R/
W
08
Same as 04
0
0
0
0
CONV3
CONV2
CONV1
CONV0
(0B)
R/
W
46
Same as 05
LHS7
SIGN
LHS6
64
LHS5
32
LHS4
16
LHS3
8
LHS2
4
LHS1
2
LHS0
1
TCRITOV FLTQUE
0C
R
00
[Reserved]
(0D)
R/
W
69
Same as 07
RHS10
SIGN
/128
RHS9
64
RHS8
32
RHS7
16
Not Used
RHS6
8
RHS5
4
RHS4
2
RHS3
1
(0E)
R/
W
00
Same as 08
RLS10
SIGN
RLS9
64
RLS8
32
RLS7
16
RLS6
8
RLS5
4
RLS4
2
RLS3
1
0F
W
–
One Shot
10
R
–
Rmt Temp LSB
(Dig Filter On or Reg
45h STFBE bit set)
Write Only. Write command triggers one temperature conversion cycle.
RT4
½
RT3
¼
RT2
⅛
Rmt Temp LSB
(Dig Filter Off)
11
R/
W
00
Rmt Temp Offset
MSB
RTO10
SIGN
RTO9
64
RTO8
32
RT1
1/16
RT0
1/32
0
0
RTO7
16
RTO7
8
0
0
0
RTO5
4
RTO4
2
RTO3
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Register
0x[HEX]
R/
W
POR
Val
12
R/
W
00
13
R/
W
14
R/
W
Register Name
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DATA BITS
D7
D6
D5
D4
D3
D2
D1
D0
Rmt Temp Offset
LSB
RTO2
½
RTO1
¼
RTO0
⅛
0
0
0
0
0
00
Rmt High Setpoint
LSB
RHS2
½
RHS1
¼
RHS0
⅛
0
0
0
0
0
00
Rmt Low Setpoint
LSB
RLS2
½
RLS1
¼
RLS0
⅛
0
0
0
0
0
1
LHAM
1
RHAM
RLAM
1
RTAM
TCHAM
RCS7
SIGN
/128
RCS6
64
RCS5
32
RCS4
16
RCS2
4
RCS1
2
RCS0
1
RTH7
0
RTH6
64
RTH5
32
RTH4
16
RTH2
4
RTH1
2
RTH0
1
15
R
00
[Reserved]
16
R/
W
A4
ALERT Mask
17-18
R
00
[Reserved]
19
R/
W
6E
Rmt T_CRIT
Setpoint
Not Used
Not Used
RCS3
8
1A–20
R
00
[Reserved]
21
R/
W
0A
Rmt T_CRIT
Hysteresis
Not Used
22–2F
R
00
[Reserved]
30
R
00
[Reserved]
0
0
0
0
0
0
0
0
31
R
–
Rmt Temp U-S MSB
RTU12
128
RTU11
64
RTU10
32
RTU9
16
RTU8
8
RTU7
4
RTU6
2
RTU5
1
32
R
–
Rmt Temp U-S LSB
Dig Filter On
RTU4
½
RTU3
¼
RTU2
⅛
RTU1
1/16
RTU0
1/32
0
0
0
0
0
0
0
0
0
Not Used
Rmt Temp U-S LSB
Dig Filter Off
33
R
-
POR Status
34–44
R
00
[Reserved]
45
R/
W
00
46
R
RTH3
8
NR
0
0
0
Enhanced Config
0
STFBE
LRES
PHR
USF
RRS1
RRS0
PSRR
–
Tach Count LSB
TAC5
TAC4
TAC3
TAC2
TAC1
TAC0
TEDGE1
TEDGE0
TAC7
TAC6
Not Used
47
R
–
Tach Count MSB
TAC13
TAC12
TAC11
TAC10
TAC9
TAC8
48
R/
W
FF
Tach Limit LSB
TACL5
TACL4
TACL3
TACL2
TACL1
TACL0
49
R/
W
FF
Tach Limit MSB
TACL13
TACL12
TACL11
TACL10
TACL9
TACL8
TACL7
TACL6
4A
R/
W
20
PWM and RPM
Config
0
0
PWPGM
PWOP
PWCKSL
0
TACH1
TACH0
4B
R/
W
3F
Fan Spin-Up Config
0
0
SPINUP
SPNDTY
1
SPNDTY SPNTIM2 SPNTIM1 SPNTIM0
0
4C
R/
W
00
PWM Value
PWVAL5
PWVAL4
PWVAL3
PWVAL2
PWVAL1
PWVAL0
4D
R/
W
17
PWM Frequency
0
0
0
PWMF4
PWMF3
PWMF2
PWMF1
PWMF0
4E
R/
W
00
Lookup Table Temp
Offset
0
0
TO5
32
TO4
16
TO3
8
TO2
4
TO1
2
TO0
1
4F
R/
W
04
Lookup Table
Hysteresis
0
0
0
LOOKH4
16
LOOKH3
8
LOOKH2
4
LOOKH1
2
LOOKH0
1
50–67
R/
W
3F, 7F
Lookup Table
68–BE
R
00
[Reserved]
BF
R/
W
00
Rmt Diode Temp
Filter
C0–FD
R
00
[Reserved]
FE
R
01
FF
R
49
18
HPWVAL HPWVAL
7
6
Not Used Not Used
0
-
Lookup Table of up to 12 PWM (3F) and Temp Pairs in 8-bit Registers (7F)
Not Used
0
0
0
0
0
RDTF1
RDTF0
ALT/CMP
Manufacturer’s ID
0
0
0
0
Step/Die Rev. ID
0
1
0
0
0
0
1
0
1
0
0
1
Not Used
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LM96063 REGISTER MAP IN FUNCTIONAL ORDER
The following is a Register Map grouped in Functional Order. Some address locations have been left blank to
maintain compatibility with LM86. Addresses in parenthesis are mirrors of named address. Reading or writing
either address will access the same 8-bit register. The Fan Control and Configuration Registers are listed first, as
there is a required order to setup these registers first and then setup the others. The detailed explanations of
each register will follow the order shown below. POR = Power-On-Reset.
Register
[HEX]
Register Name
Read/Write
POR Default
[HEX]
00
FAN CONTROL REGISTERS
45
Enhanced Configuration
R/W
4A
PWM and RPM Configuration
R/W
20
4B
Fan Spin-Up Configuration
R/W
3F
4D
PWM Frequency
R/W
17
4C
PWM Value
Read Only
(R/W if Override Bit is Set)
00
4E
Lookup Table Temperature Offset
R/W
00
4F
Lookup Table Hysteresis Temperature
R/W
04
R/W
See Fan Control
Registers
R/W
00
50–67
Lookup Table
CONFIGURATION REGISTER
03 (09)
Configuration
TACHOMETER COUNT AND LIMIT REGISTERS
46
Tach Count LSB
Read Only
N/A
47
Tach Count MSB
Read Only
N/A
48
Tach Limit LSB
R/W
FF
49
Tach Limit MSB
R/W
FF
LOCAL TEMPERATURE AND LOCAL SETPOINT REGISTERS
00
Local Temperature
Read Only
N/A
05 (0B)
Local High Setpoint
R/W
46 (70°)
REMOTE DIODE TEMPERATURE AND SETPOINT REGISTERS
01
Remote Temperature Signed MSB
Read Only
N/A
10
Remote Temperature Signed LSB
Read Only
N/A
31
Remote Temperature Unsigned MSB
Read Only
N/A
32
Remote Temperature Unsigned LSB
Read Only
N/A
11
Remote Temperature Offset MSB
R/W
00
12
Remote Temperature Offset LSB
R/W
00
07 (0D)
Remote High Setpoint MSB
R/W
69 (105°C)
13
Remote High Setpoint LSB
R/W
00
08 (0E)
Remote Low Setpoint MSB
R/W
00 (0°C)
14
Remote Low Setpoint LSB
R/W
00
19
Remote T_CRIT Setpoint
R/W
6E (110°C)
21
Remote T_CRIT Hyst
R/W
0A (10°C)
BF
Remote Diode Temperature Filter and Comparator Mode
R/W
00
CONVERSION AND ONE-SHOT REGISTERS
04 (0A)
0F
Conversion Rate
One-Shot
R/W
08
Write Only
N/A
N/A
STATUS AND MASK REGISTERS
02
ALERT Status
Read Only
16
ALERT Mask
R/W
A4
33
Power On Reset Status
Read Only
N/A
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LM96063
SNIS149B – NOVEMBER 2011 – REVISED MARCH 2013
Register
[HEX]
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Register Name
Read/Write
POR Default
[HEX]
ID AND TEST REGISTERS
FE
Manufacturer ID
Read Only
01
FF
Stepping/Die Rev. ID
Read Only
49
[RESERVED] REGISTERS—NOT USED
06
Not Used
N/A
N/A
0C
Not Used
N/A
N/A
15
Not Used
N/A
N/A
17-18
Not Used
N/A
N/A
1A–20
Not Used
N/A
N/A
22–29
Not Used
N/A
N/A
34–44
Not Used
N/A
N/A
68–BE
Not Used
N/A
N/A
C0–FD
Not Used
N/A
N/A
LM96063 REQUIRED INITIAL FAN CONTROL REGISTER SEQUENCE
Important! The BIOS or firmware must follow the sequence below to configure the following Fan Registers for
the LM96063 before using any of the Fan or Tachometer or PWM registers:
[Register]HEX and Setup Instructions (1)
Step
(1)
1
After power up check to make sure that the Not Ready bit is cleared in the POR Status register [33] bit 7.
2
[4A] Write bits 0 and 1; 3 and 4. This includes tach settings if used, PWM internal clock select (1.4 kHz or 360 kHz) and PWM
Output Polarity.
3
[4B] Write bits 0 through 5 to program the spin-up settings.
4
[4D] Write bits 0 through 4 to set the frequency settings. This works with the PWM internal clock select. If 22.5 kHz is selected
then enhanced fan control functions such as Lookup Table transition smoothing with extended PWM duty cycle resolution is
available and should be setup [45].
5
Choose, then write, only one of the following:
A. [4F–67] the Lookup Table and [4E] the Lookup Table Offset, [45] Lookup Table Temperature Resolution can also be
modified
or
B. [4C] the PWM value bits 0 through 5 or bits 0 through 7 if extended duty cycle resolution is selected.
6
If Step 4A, Lookup Table, was chosen and written then write [4A] bit 5 PWPGM = 0. PWPGM should be set to 1 to enable
writing to the fan control registers listed in this table.
All other registers can be written at any time after the above sequence.
LM96063 DETAILED REGISTER DESCRIPTIONS IN FUNCTIONAL ORDER
The following is a Register Map grouped in functional and sequence order. New register addresses have been
added to maintain compatibility with the LM63 and LM64 register sets. Addresses in parenthesis are mirrors of
named address for backwards compatibility with some older software. Reading or writing either address will
access the same 8-bit register.
20
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Fan Control Registers
Address
Hex
Read/
Write
Bits
POR
Value
Name
Description
45HEX ENHANCED CONFIGURATION
R
7
0
[Reserved]
This bit is unused and always read as 0.
Signed Temperature Filter Bits Enable
0: external signed temperature LSbs [4:3] will always read "0" (backwards
compatible with the LM63)
1: when the digital filter is enabled the external signed temperature LSbs [4:3]
(1/16 and 1/32 resolution) are enabled
R/W
6
0
STFBE
R/W
5
0
LRES
Lookup Table Resolution Extension
0: LUT temperature resolution 7-bits (LSb = 1°C, backwards compatible with the
LM63)
1: enable 8-bit LUT temperature resolution (LSb extended to 0.5°C)
R/W
4
0
PHR
22.5kHz PWM High Resolution Control (only effective when PWM frequency set to
22.5kHz)
0: PWM resolution 6.25% (backwards compatible with the LM63)
1: enable high resolution (0.39%)
USF
Unsigned High and T_CRIT Setpoint Format
0: enable signed format for High and T_CRIT setpoints (11-bit is -128.000°C to
127.875°C or 8-bit is -128°C to 127°C)
1: enable unsigned format for High and T_CRIT setpoints (11-bit is 0°C to
255.875°C or 8-bit is 0°C to 255°C)
R/W
3
0
45
R/W
R/W
2:1
0
00
0
RRS1:RRS0
PWM Smoothing Ramp Rate Setting (these bits can modified only when PWM
Programming is enabled, 0x4A[5]=1)
00: 0.023 s per step (5.45 seconds for 0 to 100% duty cycle transition with 0.39%
resolution)
01: 0.046 s per step (10.9 seconds for 0 to 100% duty cycle transition with 0.39%
resolution)
10: 0.91 s per step (21.6 seconds for 0 to 100% duty cycle transition with 0.39%
resolution)
11: 0.182 s per step (43.7 seconds for 0 to 100% duty cycle transition with 0.39%
resolution)
Note: PWM smoothing is disabled for PWM spinup and for duty cycle setting
override caused by a TCRIT event, thus it is only enabled during LUT transitions.
PWM smoothing is only effective when PWM frequency is set to 22.5kHz.
PSRR
PWM Smoothing Ramp Rate Control (this bit can modified only when the PWM
Programming is enabled, 0x4A[5]=1)
0: PWM smoothing disabled (LM63 backwards compatible)
1: enable ramp rate control (as controlled by 0x45[2:1])
Note: PWM smoothing is disabled for PWM spinup and for duty cycle setting
override caused by a TCRIT event, thus it is only enabled during LUT transitions.
PWM smoothing is only effective when PWM frequency is set to 22.5kHz
4AHEX FAN PWM AND TACHOMETER CONFIGURATION REGISTER
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Address
Hex
4A
Read/
Write
Bits
POR
Value
Name
R
7:6
00
[Reserved]
R/W
5
1
PWPGM
4
0
PWOP
3
0
PWCLSL
2
0
[Reserved]
1:0
00
TACH1:TACH0
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Description
These bits are unused and always read as 0.
PWM Programming enable
0: the PWM Value (register 0x4C), the PWM Smoothing (0x45[2:0]) and the
Lookup Table (Registers 0x50–0x67) are read-only. The PWM value (0 to 100%) is
determined by the current remote diode temperature and the Lookup Table, and
can be read from the PWM value register.
1: the PWM value (register 0x4C), the PWM Smoothing (0x45[2:0]) and the Lookup
Table (Registers 0x50–0x67) are read/write enabled. Writing the PWM Value
register will set the PWM output. This is also the state during which the Lookup
Table can be written.
PWM Output Polarity
0: the PWM output pin will be 0V for fan OFF and open for fan ON.
1: the PWM output pin will be open for fan OFF and 0V for fan ON.
PWM Master Clock Select
0: the master PWM clock is 360 kHz
1: the master PWM clock is 1.4 kHz.
Always write 0 to this bit.
Tachometer Mode
00: Traditional tach input monitor, false readings when under minimum detectable
RPM. (Smart-TACH mode disabled)
01: Traditional tach input monitor, FFFFh reading when under minimum detectable
RPM. Smart-TACH mode enabled, PWM duty cycle not affected. Use with direct
PWM drive of fan power. TACH readings can cause an error event if TACH
setpoint register is set to less than FFFFh even though fan may be spinning
properly.
10: Most accurate readings, FFFFh reading when under minimum detectable RPM.
Smart-TACH mode enabled, PWM duty cycle modified. Use with direct PWM drive
of fan power. This mode extends the TACH monitoring low RPM sensitivity.
11: Least effort on programmed PWM of fan, FFFF reading when under minimum
detectable RPM. Smart-TACH mode enabled. Use with direct PWM drive of fan
power. This mode extends the TACH monitoring low RPM sensitivity the most.
Note: If the PWM Master Clock is 360 kHz, mode 00 is used regardless of the
setting of these two bits.
4BHEX FAN SPIN-UP CONFIGURATION REGISTER
R
7:6
5
4B
R/W
4:3
2:0
22
0
[Reserved]
1
SPINUP
These bits are unused and always read as 0
Fast Tachometer Spin-up
If 0, the fan spin-up uses the duty cycle and spin-up time, bits 0–4.
If 1, the LM96063 sets the PWM output to 100% until the spin-up times out (per
bits 0–2) or the minimum desired RPM has been reached (per the Tachometer
Setpoint setting) using the tachometer input, whichever happens first. This bit
overrides the PWM Spin-Up Duty Cycle register (bits 4:3)—PWM output is always
100%. Register x03, bit 2 = 1 for Tachometer mode.
If PWM Spin-Up Time (bits 2:0) = 000, the Spin-Up cycle is bypassed, regardless
of the state of this bit.
11
PWM Spin-Up Duty Cycle
00: Spin-Up cycle bypassed (no Spin-Up), unless Fast Tachometer Terminated
SPNDTY1:SPNDT Spin-Up (bit 5) is set.
Y0
01: 50%
10: 75%–81% Depends on PWM Frequency. See Application Notes.
11: 100%
111
PWM Spin-Up Time Interval
000: Spin-Up cycle bypassed (No Spin-Up)
001: 0.05 seconds
010: 0.1 s
SPNTIM2:SPNTIM
011: 0.2 s
0
100: 0.4 s
101: 0.8 s
110: 1.6 s
111: 3.2 s
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Address
Hex
SNIS149B – NOVEMBER 2011 – REVISED MARCH 2013
Read/
Write
Bits
POR
Value
Name
Description
4CHEX PWM VALUE REGISTER
4C
Read
(Write
only if
reg 4A
bit 5 =
1.)
7:6
00
5:0
0x00
HPWVAL7:HPWV
AL6
PWM High Resolution and Low Resolution Values
If PWM Program (register 4A, bit 5) = 0 this register is read only, this register
reflects the LM96063’s current PWM value from the Lookup Table.
If PWM Program (register 4A, bit 5) = 1, this register is read/write and the desired
PWM value is written directly to this register, instead of from the Lookup Table, for
PWVAL5:PWVAL0 direct fan speed control.
This register will read 0 during the Spin-Up cycle.
See Application Notes at the end of this datasheet for more information regarding
the PWM Value and Duty Cycle in %.
4DHEX FAN PWM FREQUENCY REGISTER
R
4D
R/W
7:5
4:0
000
0x17
[Reserved]
PWMF4:PWMF0
These bits are unused and always read as 0
PWM Output Frequency
The PWM Frequency = PWM_Clock / 2n, where PWM Master Clock = 360 kHz or
1.4 kHz (per the PWM Master Clock Select bit in Register 4A), and n = value of the
register. Note: n = 0 is mapped to n = 1. See the Application Note at the end of this
datasheet.
4EHEX LOOKUP TABLE TEMPERATURE OFFSET
4E
R
7:6
00
[Reserved]
R/W
5:0
0x00
TO5:TO0
These bits are unused and always read as 0.
The temperature offset applied to the temperature values of the lookup table. This
offset allows the lookup table temperature settings to be extended above 127°C.
The value, which is always positive, has an unsigned format with 1°C resolution.
The maximum offset that can be programmed is +63°C.
4FHEX LOOKUP TABLE HYSTERESIS
4F
R
7:5
000
R/W
4:0
0x04
[Reserved]
These bits are unused and always read as 0
Lookup Table Hysteresis
LOOKH4:LOOKH0 The amount of hysteresis applied to the Lookup Table. (1 LSb = 1°C, max value
31°C, default value 10°C).
50HEX to 67HEX LOOKUP TABLE (7/8 Bits for Temperature and 6/8 Bits for PWM for each Temperature/PWM Pair)
50
7
0
E1T7
6:0
0x7F
E1T6:E1T0
Read.
(Write
only if
reg 4A
bit 5 =
1)
Lookup Table Temperature Entry 1
Bit 7 is unused and always set to 0 in the low resolution temperature LUT mode. In
the high resolution temperature LUT mode bit 7 in conjunction with bits 6:0 of this
register are used to determine the limit temperature that the remote diode
temperature is compared to. In high resolution the range is 0°C to 127.5°C. In low
resolution mode the range is 0°C to 127°C. If the remote diode temperature
exceeds this value, the PWM output will be the value in Register 0x51. Only 9-bits
of the temperature reading are used in high resolution and 8-bits in low resolution.
Only positive temperature values can be programed in this register and in all cases
the sign bit is assumed to be zero. Temperatures greater than 127 °C or 127.5 °C
can be programmed through the use of the Lookup Table Temperature Offset
Register (4Eh).
7:6
00
E1D7:E1D6
Lookup Table PWM Duty Cycle Extended Entry 1
These bits are unused and always set to 0 in the low resolution duty cycle LUT
mode. In the high resolution duty cycle LUT mode these bits in association with
bits 5:0 of this register are used for the PWM value associated with the
temperature limit in register 0x50. These bits can only be activated when PWM
frequency of 22.5kHz is chosen.
5:0
0x3F
E1D5:E1D0
Lookup Table PWM Duty Cycle Entry 1
The PWM value corresponding to the temperature limit in register 0x50 for the low
resolution PWM mode.
51
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LM96063
SNIS149B – NOVEMBER 2011 – REVISED MARCH 2013
Address
Hex
Read/
Write
52
Bits
POR
Value
Name
Description
7
0
E2T7
6:0
0x7F
E2T6:E2T0
Lookup Table Temperature Entry 2
Bit 7 is unused and always set to 0 in the low resolution temperature LUT mode. In
the high resolution temperature LUT mode bit 7 in conjunction with bits 6:0 of this
register are used to determine the limit temperature that the remote diode
temperature is compared to. In high resolution the range is 0°C to 127.5°C. In low
resolution mode the range is 0°C to 127°C. If the remote diode temperature
exceeds this value, the PWM output will be the value in Register 0x53. Only 9-bits
of the temperature reading are used in high resolution and 8-bits in low resolution.
Only positive temperature values can be programed in this register and in all cases
the sign bit is assumed to be zero. Temperatures greater than 127 °C or 127.5 °C
can be programmed through the use of the Lookup Table Temperature Offset
Register (4Eh).
Read.
(Write
only if
reg 4A
bit 5 =
1)
7:6
00
E2D7:E2D6
Lookup Table PWM Duty Cycle Extended Entry 2
These bits are unused and always set to 0 in the low resolution duty cycle LUT
mode. In the high resolution duty cycle LUT mode these bits in association with
bits 5:0 of this register are used for the PWM value associated with the
temperature limit in register 0x52. These bits can only be activated when PWM
frequency of 22.5kHz is chosen.
5:0
0x3F
E2D5:E2D0
Lookup Table PWM Duty Cycle Entry 2
The PWM value corresponding to the temperature limit in register 0x52 for the low
resolution PWM mode.
7
0
E3T7
6:0
0x7F
E3T6:E3T0
53
54
Read.
(Write
only if
reg 4A
bit 5 =
1)
7:6
00
E3D7:E3D6
5:0
0x3F
E3D5:E3D0
Lookup Table PWM Duty Cycle Entry 3
The PWM value corresponding to the temperature limit in register 0x54 for the low
resolution PWM mode.
7
0
E4T7
6:0
0x7F
E4T6:E4T0
Read.
(Write
only if
reg 4A
bit 5 =
1)
Lookup Table Temperature Entry 4
Bit 7 is unused and always set to 0 in the low resolution temperature LUT mode. In
the high resolution temperature LUT mode bit 7 in conjunction with bits 6:0 of this
register are used to determine the limit temperature that the remote diode
temperature is compared to. In high resolution the range is 0°C to 127.5°C. In low
resolution mode the range is 0°C to 127°C. If the remote diode temperature
exceeds this value, the PWM output will be the value in Register 0x57. Only 9-bits
of the temperature reading are used in high resolution and 8-bits in low resolution.
Only positive temperature values can be programed in this register and in all cases
the sign bit is assumed to be zero. Temperatures greater than 127 °C or 127.5 °C
can be programmed through the use of the Lookup Table Temperature Offset
Register (4Eh).
7:6
00
E4D7:E4D6
Lookup Table PWM Duty Cycle Extended Entry 4
These bits are unused and always set to 0 in the low resolution duty cycle LUT
mode. In the high resolution duty cycle LUT mode these bits in association with
bits 5:0 of this register are used for the PWM value associated with the
temperature limit in register 0x56. These bits can only be activated when PWM
frequency of 22.5kHz is chosen.
5:0
0x3F
E4D5:E4D0
Lookup Table PWM Duty Cycle Entry 4
The PWM value corresponding to the temperature limit in register 0x56 for the low
resolution PWM mode.
57
24
Lookup Table Temperature Entry 3
Bit 7 is unused and always set to 0 in the low resolution temperature LUT mode. In
the high resolution temperature LUT mode bit 7 in conjunction with bits 6:0 of this
register are used to determine the limit temperature that the remote diode
temperature is compared to. In high resolution the range is 0°C to 127.5°C. In low
resolution mode the range is 0°C to 127°C. If the remote diode temperature
exceeds this value, the PWM output will be the value in Register 0x55. Only 9-bits
of the temperature reading are used in high resolution and 8-bits in low resolution.
Only positive temperature values can be programed in this register and in all cases
the sign bit is assumed to be zero. Temperatures greater than 127 °C or 127.5 °C
can be programmed through the use of the Lookup Table Temperature Offset
Register (4Eh).
Lookup Table PWM Duty Cycle Extended Entry 3
These bits are unused and always set to 0 in the low resolution duty cycle LUT
mode. In the high resolution duty cycle LUT mode these bits in association with
bits 5:0 of this register are used for the PWM value associated with the
temperature limit in register 0x54. These bits can only be activated when PWM
frequency of 22.5kHz is chosen.
55
56
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Address
Hex
SNIS149B – NOVEMBER 2011 – REVISED MARCH 2013
Read/
Write
58
Bits
POR
Value
Name
Description
7
0
E5T7
6:0
0x7F
E5T6:E5T0
Lookup Table Temperature Entry 5
Bit 7 is unused and always set to 0 in the low resolution temperature LUT mode. In
the high resolution temperature LUT mode bit 7 in conjunction with bits 6:0 of this
register are used to determine the limit temperature that the remote diode
temperature is compared to. In high resolution the range is 0°C to 127.5°C. In low
resolution mode the range is 0°C to 127°C. If the remote diode temperature
exceeds this value, the PWM output will be the value in Register 0x59. Only 9-bits
of the temperature reading are used in high resolution and 8-bits in low resolution.
Only positive temperature values can be programed in this register and in all cases
the sign bit is assumed to be zero. Temperatures greater than 127 °C or 127.5 °C
can be programmed through the use of the Lookup Table Temperature Offset
Register (4Eh).
Read.
(Write
only if
reg 4A
bit 5 =
1)
7:6
00
E5D7:E5D6
Lookup Table PWM Duty Cycle Extended Entry 5
These bits are unused and always set to 0 in the low resolution duty cycle LUT
mode. In the high resolution duty cycle LUT mode these bits in association with
bits 5:0 of this register are used for the PWM value associated with the
temperature limit in register 0x58. These bits can only be activated when PWM
frequency of 22.5kHz is chosen.
5:0
0x3F
E5D5:E5D0
Lookup Table PWM Duty Cycle Entry 5
The PWM value corresponding to the temperature limit in register 0x58 for the low
resolution PWM mode.
7
0
E6T7
6:0
0x7F
E6T6:E6T0
59
5A
Read.
(Write
only if
reg 4A
bit 5 =
1)
7:6
00
E6D7:E6D6
Lookup Table PWM Duty Cycle Extended Entry 6
These bits are unused and always set to 0 in the low resolution duty cycle LUT
mode. In the high resolution duty cycle LUT mode these bits in association with
bits 5:0 of this register are used for the PWM value associated with the
temperature limit in register 0x5A. These bits can only be activated when PWM
frequency of 22.5kHz is chosen.
5:0
0x3F
E6D5:E6D0
Lookup Table PWM Duty Cycle Entry 6
The PWM value corresponding to the temperature limit in register 0x5A for the low
resolution PWM mode.
7
0
E7T7
6:0
0x7F
E7T6:E7T0
5B
5C
Lookup Table Temperature Entry 6
Bit 7 is unused and always set to 0 in the low resolution temperature LUT mode. In
the high resolution temperature LUT mode bit 7 in conjunction with bits 6:0 of this
register are used to determine the limit temperature that the remote diode
temperature is compared to. In high resolution the range is 0°C to 127.5°C. In low
resolution mode the range is 0°C to 127°C. If the remote diode temperature
exceeds this value, the PWM output will be the value in Register 0x5B. Only 9-bits
of the temperature reading are used in high resolution and 8-bits in low resolution.
Only positive temperature values can be programed in this register and in all cases
the sign bit is assumed to be zero. Temperatures greater than 127 °C or 127.5 °C
can be programmed through the use of the Lookup Table Temperature Offset
Register (4Eh).
Read.
(Write
only if
reg 4A
bit 5 =
1)
Lookup Table Temperature Entry 7
Bit 7 is unused and always set to 0 in the low resolution temperature LUT mode. In
the high resolution temperature LUT mode bit 7 in conjunction with bits 6:0 of this
register are used to determine the limit temperature that the remote diode
temperature is compared to. In high resolution the range is 0°C to 127.5°C. In low
resolution mode the range is 0°C to 127°C. If the remote diode temperature
exceeds this value, the PWM output will be the value in Register 0x5D. Only 9-bits
of the temperature reading are used in high resolution and 8-bits in low resolution.
Only positive temperature values can be programed in this register and in all cases
the sign bit is assumed to be zero. Temperatures greater than 127 °C or 127.5 °C
can be programmed through the use of the Lookup Table Temperature Offset
Register (4Eh).
7:6
00
E7D7:E7D6
Lookup Table PWM Duty Cycle Extended Entry 7
These bits are unused and always set to 0 in the low resolution duty cycle LUT
mode. In the high resolution duty cycle LUT mode these bits in association with
bits 5:0 of this register are used for the PWM value associated with the
temperature limit in register 0x5C. These bits can only be activated when PWM
frequency of 22.5kHz is chosen.
5:0
0x3F
E7D5:E7D0
Lookup Table PWM Duty Cycle Entry 7
The PWM value corresponding to the temperature limit in register 0x5C for the low
resolution PWM mode.
5D
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Address
Hex
Read/
Write
5E
Bits
POR
Value
Name
Description
7
0
E8T7
6:0
0x7F
E8T6:E8T0
Lookup Table Temperature Entry 8
Bit 7 is unused and always set to 0 in the low resolution temperature LUT mode. In
the high resolution temperature LUT mode bit 7 in conjunction with bits 6:0 of this
register are used to determine the limit temperature that the remote diode
temperature is compared to. In high resolution the range is 0°C to 127.5°C. In low
resolution mode the range is 0°C to 127°C. If the remote diode temperature
exceeds this value, the PWM output will be the value in Register 0x5F. Only 9-bits
of the temperature reading are used in high resolution and 8-bits in low resolution.
Only positive temperature values can be programed in this register and in all cases
the sign bit is assumed to be zero. Temperatures greater than 127 °C or 127.5 °C
can be programmed through the use of the Lookup Table Temperature Offset
Register (4Eh).
Read.
(Write
only if
reg 4A
bit 5 =
1)
7:6
00
E8D7:E8D6
Lookup Table PWM Duty Cycle Extended Entry 8
These bits are unused and always set to 0 in the low resolution duty cycle LUT
mode. In the high resolution duty cycle LUT mode these bits in association with
bits 5:0 of this register are used for the PWM value associated with the
temperature limit in register 0x5E. These bits can only be activated when PWM
frequency of 22.5kHz is chosen.
5:0
0x3F
E8D5:E8D0
Lookup Table PWM Duty Cycle Entry 8
The PWM value corresponding to the temperature limit in register 0x5E for the low
resolution PWM mode.
7
0
E9T7
6:0
0x7F
E9T6:E9T0
5F
60
Read.
(Write
only if
reg 4A
bit 5 =
1)
7:6
00
E9D7:E9D6
5:0
0x3F
E9D5:E9D0
Lookup Table PWM Duty Cycle Entry 9
The PWM value corresponding to the temperature limit in register 0x60 for the low
resolution PWM mode.
7
0
E10T7
6:0
0x7F
E10T6:E10T0
Read.
(Write
only if
reg 4A
bit 5 =
1)
Lookup Table Temperature Entry 10
Bit 7 is unused and always set to 0 in the low resolution temperature LUT mode. In
the high resolution temperature LUT mode bit 7 in conjunction with bits 6:0 of this
register are used to determine the limit temperature that the remote diode
temperature is compared to. In high resolution the range is 0°C to 127.5°C. In low
resolution mode the range is 0°C to 127°C. If the remote diode temperature
exceeds this value, the PWM output will be the value in Register 0x63. Only 9-bits
of the temperature reading are used in high resolution and 8-bits in low resolution.
Only positive temperature values can be programed in this register and in all cases
the sign bit is assumed to be zero. Temperatures greater than 127 °C or 127.5 °C
can be programmed through the use of the Lookup Table Temperature Offset
Register (4Eh).
7:6
00
E10D7:E10D6
Lookup Table PWM Duty Cycle Extended Entry 10
These bits are unused and always set to 0 in the low resolution duty cycle LUT
mode. In the high resolution duty cycle LUT mode these bits in association with
bits 5:0 of this register are used for the PWM value associated with the
temperature limit in register 0x62. These bits can only be activated when PWM
frequency of 22.5kHz is chosen.
5:0
0x3F
E10D5:E10D0
Lookup Table PWM Duty Cycle Entry 10
The PWM value corresponding to the temperature limit in register 0x62 for the low
resolution PWM mode.
63
26
Lookup Table Temperature Entry 9
Bit 7 is unused and always set to 0 in the low resolution temperature LUT mode. In
the high resolution temperature LUT mode bit 7 in conjunction with bits 6:0 of this
register are used to determine the limit temperature that the remote diode
temperature is compared to. In high resolution the range is 0°C to 127.5°C. In low
resolution mode the range is 0°C to 127°C. If the remote diode temperature
exceeds this value, the PWM output will be the value in Register 0x61. Only 9-bits
of the temperature reading are used in high resolution and 8-bits in low resolution.
Only positive temperature values can be programed in this register and in all cases
the sign bit is assumed to be zero. Temperatures greater than 127 °C or 127.5 °C
can be programmed through the use of the Lookup Table Temperature Offset
Register (4Eh).
Lookup Table PWM Duty Cycle Extended Entry 9
These bits are unused and always set to 0 in the low resolution duty cycle LUT
mode. In the high resolution duty cycle LUT mode these bits in association with
bits 5:0 of this register are used for the PWM value associated with the
temperature limit in register 0x60. These bits can only be activated when PWM
frequency of 22.5kHz is chosen.
61
62
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Address
Hex
SNIS149B – NOVEMBER 2011 – REVISED MARCH 2013
Read/
Write
64
Bits
POR
Value
Name
Description
7
0
E11T7
6:0
0x7F
E11T6:E11T0
Lookup Table Temperature Entry 11
Bit 7 is unused and always set to 0 in the low resolution temperature LUT mode. In
the high resolution temperature LUT mode bit 7 in conjunction with bits 6:0 of this
register are used to determine the limit temperature that the remote diode
temperature is compared to. In high resolution the range is 0°C to 127.5°C. In low
resolution mode the range is 0°C to 127°C. If the remote diode temperature
exceeds this value, the PWM output will be the value in Register 0x65. Only 9-bits
of the temperature reading are used in high resolution and 8-bits in low resolution.
Only positive temperature values can be programed in this register and in all cases
the sign bit is assumed to be zero. Temperatures greater than 127 °C or 127.5 °C
can be programmed through the use of the Lookup Table Temperature Offset
Register (4Eh).
Read.
(Write
only if
reg 4A
bit 5 =
1)
7:6
00
E11D7:E11D6
Lookup Table PWM Duty Cycle Extended Entry 11
These bits are unused and always set to 0 in the low resolution duty cycle LUT
mode. In the high resolution duty cycle LUT mode these bits in association with
bits 5:0 of this register are used for the PWM value associated with the
temperature limit in register 0x64. These bits can only be activated when PWM
frequency of 22.5kHz is chosen.
5:0
0x3F
E11D5:E11D0
Lookup Table PWM Duty Cycle Entry 11
The PWM value corresponding to the temperature limit in register 0x64 for the low
resolution PWM mode.
7
0
E12T7
6:0
0x7F
E12T6:E12T0
65
66
Read.
(Write
only if
reg 4A
bit 5 =
1)
Lookup Table Temperature Entry 12
Bit 7 is unused and always set to 0 in the low resolution temperature LUT mode. In
the high resolution temperature LUT mode bit 7 in conjunction with bits 6:0 of this
register are used to determine the limit temperature that the remote diode
temperature is compared to. In high resolution the range is 0°C to 127.5°C. In low
resolution mode the range is 0°C to 127°C. If the remote diode temperature
exceeds this value, the PWM output will be the value in Register 0x67. Only 9-bits
of the temperature reading are used in high resolution and 8-bits in low resolution.
Only positive temperature values can be programed in this register and in all cases
the sign bit is assumed to be zero. Temperatures greater than 127 °C or 127.5 °C
can be programmed through the use of the Lookup Table Temperature Offset
Register (4Eh).
7:6
00
E12D7:E12D6
Lookup Table PWM Duty Cycle Extended Entry 12
These bits are unused and always set to 0 in the low resolution duty cycle LUT
mode. In the high resolution duty cycle LUT mode these bits in association with
bits 5:0 of this register are used for the PWM value associated with the
temperature limit in register 0x66. These bits can only be activated when PWM
frequency of 22.5kHz is chosen.
5:0
0x3F
E12D5:E12D0
Lookup Table PWM Duty Cycle Entry 12
The PWM value corresponding to the temperature limit in register 0x66 for the low
resolution PWM mode.
67
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LM96063
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Configuration Register
Address
Hex
Read/
Write
Bits
POR
Value
Name
Description
03 (09)HEX CONFIGURATION REGISTER
7
R/W
6
0
ALERT Mask
0: ALERT interrupts are enabled.
1: ALERT interrupts are masked, and the ALERT pin is always in a high
impedance (open) state.
ALTMSK
0
Standby
0: the LM96063 is in operational mode, converting, comparing, and updating the
PWM output continuously.
1: the LM96063 enters a low power standby mode.
In standby, continuous conversions are stopped, but a conversion/comparison
cycle may be initiated by writing any value to register 0x0F the One-shot Register.
Operation of the PWM output in standby depends on the setting of bit 5 in this
register.
STBY
PWM Disable in Standby
0: the LM96063’s PWM output continues to output the current fan control signal
while in STANDBY.
1: the PWM output is disabled (as defined by the PWM polarity bit) while in
STANDBY.
5
0
PWMDIS
4:3
00
[Reserved]
2
0
TCHEN
1
0
TCRITOV
T_CRIT Limit Override
0: locks the T_CRIT limit for the remote diode, POR setting is nominally 110°C
1: unlocks the T_CRIT limit and allows it to be reprogrammed multiple times
FLTQUE
RDTS Fault Queue
0: an ALERT will be generated if any Remote Diode conversion result is above the
Remote High Set Point or below the Remote Low Setpoint.
1: an ALERT will be generated only if three consecutive Remote Diode
conversions are above the Remote High Set Point or below the Remote Low
Setpoint.
03 (09)
R
This bit is unused and always read as 0.
TACH Enable
0: disables the TACH input
1: enables the TACH input
R/W
0
0
Tachometer Count and Limit Registers
Address
Hex
Read/
Write
Bits
POR
Value
Name
Description
47HEX TACHOMETER COUNT (MSB) and 46HEX TACHOMETER COUNT (LSB) REGISTERS (16 bits: Read LSB first to lock MSB and
ensure MSB and LSB are from the same reading)
47
R
7:0
N/A
TAC13:TAC6
R
7:2
N/A
TAC5:TAC0
Tachometer Count (MSB and LSB)
These registers contain the current 16-bit Tachometer Count, representing the
period of time between tach pulses.
Note that the 16-bit tachometer MSB and LSB register addresses are in reverse
order from the 16 bit temperature readings.
Tachometer Edge Programming
Bits
46
Edges Used
00:
R
1:0
00
TEDGE1:TEDGE0
Tach_Count_Multiple
Reserved - do not use
01:
2
4
10:
3
2
11:
5
1
Note: If PWM_Clock_Select = 360 kHz, then Tach_Count_Multiple = 1 regardless
of the setting of these bits.
49HEX TACHOMETER LIMIT (MSB) and 48HEX TACHOMETER LIMIT (LSB) REGISTERS
28
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Address
Hex
Read/
Write
Bits
POR
Value
Name
Description
49
R/W
7:0
0xFF
TACL13:TACL6
R/W
7:2
Tachometer Limit (MSB and LSB)
These registers contain the current 14-bit Tachometer Count, representing the
period of time between tach pulses. Fan RPM = (f * 5,400,000) / (Tachometer
Count), where f = 1 for 2 pulses/rev fan; f = 2 for 1 pulse/rev fan; and f = 2/3 for 3
pulses/rev fan. See Application Notes for more tachometer information. Note that
the 16-bit tachometer MSB and LSB register addresses are in reverse order from
the 16 bit temperature readings.
R/W
1:0
48
0xFF
TACHL5:TACL0
[Reserved]
These bits are not used and write 0 or 1.
Local Temperature and Local High Setpoint Registers
Address
Hex
Read/
Write
Bits
POR
Value
Name
Description
00HEX LOCAL TEMPERATURE REGISTER (8-bits)
00
R
7:0
N/A
LT7:LT0
Local Temperature Reading (8-bit)
8-bit integer representing the temperature of the LM96063 die.
LT7 is the SIGN bit
LT6 has a bit weight of 64°C
LT5 has a bit weight of 32°C
LT4 has a bit weight of 16°C
LT3 has a bit weight of 8°C
LT2 has a bit weight of 4°C
LT1 has a bit weight of 2°C
LT0 has a bit weight of 1°C
05 (0B)HEX LOCAL HIGH SETPOINT REGISTER (8-bits)
05
R/W
7:0
0x46
(70°)
LHS7:LHS0
Local HIGH Setpoint
High Setpoint for the internal diode.
LHS7 is the SIGN bit
LHS6 has a bit weight of 64°C
LHS5 has a bit weight of 32°C
LHS4 has a bit weight of 16°C
LHS3 has a bit weight of 8°C
LHS2 has a bit weight of 4°C
LHS1 has a bit weight of 2°C
LHS0 has a bit weight of 1°C
Remote Diode Temperature, Offset and Setpoint Registers
Address
Hex
Read/
Write
Bits
POR
Value
Name
Description
01HEX AND 10HEX SIGNED REMOTE DIODE TEMPERATURE REGISTERS
01
10
R
R
7:0
N/A
RT12:RT5
Most Significant Byte of the Signed Remote Diode Temperature Reading
The most significant 8-bits of the 2’s complement value, representing the
temperature of the remote diode connected to the LM96063. Bit 7 is the sign bit,
bit 6 has a weight of 64°C, and bit 0 has a weight of 1°C. This byte to be read
before the LSB.
Least Significant Byte of the Signed Remote Diode Temperature Reading
This is the LSB of the 2’s complement value, representing the temperature of the
remote diode connected to the LM96063. RT4 has a weight 0.5°C, RT3 has a
weight of 0.25°C, and RT2 has a weight of 0.125°C. If the digital filter is turned off
RT1:RT0 have a value of 00 unless extended resolution (Reg 45h STFBE bit set)
is enabled. If extended resolution is chosen, for readings greater than 127.875
RT1:RT0=11 and for other cases RT1:RT0=00. When the digital filter is turned on
and extended resolution enabled: RT1 has a weight of 0.0625 and RT0 has a
weight of 0.03125°C
7:3
N/A
RT4:RT0
2:0
00
[Reserved]
These bits are unused and always read as 0.
31HEX AND 32HEX UNSIGNED REMOTE DIODE TEMPERATURE REGISTERS
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LM96063
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Address
Hex
31
Read/
Write
R
32
R
Bits
7:0
POR
Value
N/A
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Name
Description
RTU12:RTU5
Most Significant Byte of the Unsigned Format Remote Diode Temperature
Reading
The most significant 8-bits of the unsigned format value, representing the
temperature of the remote diode connected to the LM96063. Bit 7 has a weight of
128°C, bit 6 has a weight of 64°C, and bit 0 has a weight of 1°C. This byte to be
read before the LSB.
Least Significant Byte of the Unsigned Format Remote Diode Temperature
Reading
This is the LSB of the unsigned value, representing the temperature of the remote
diode connected to the LM96063. Bit 4 has a weight 0.5°C, bit 3 has a weight of
0.25°C, and bit 2 has a weight of 0.125°C. if the digital filter is turned off
RUT1:RUT0 have a value of 00. When the digital filter is turned on: bit 1 has a
weight of 0.0625 and bit 0 has a weight of 0.03125°C
7:3
N/A
RUT4:RUT0
2:0
00
[Reserved]
These bits are unused and always read as 0.
11HEX AND 12HEX REMOTE TEMPERATURE OFFSET REGISTERS
11
12
R/W
7:0
0x00
RTO10:RTO3
R/W
7:5
000
RTO2:RTO1
R
4:0
000
[Reserved]
Remote Temperature Offset (MSB and LSB)
These registers contain the value added to or subtracted from the remote diode’s
reading to compensate for the different non-ideality factors of different
processors, diodes, etc. The 2’s complement value, in these registers is added to
the output of the LM96063’s ADC to form the temperature reading contained in
registers 01 and 10. These registers have the same format as the MSB and LSB
Remote Diode Temperature Reading registers with the digital filter off.
These bits are not used and always read as 0.
07 (0D)HEX AND 13HEX REMOTE HIGH SETPOINT REGISTERS
07 (0D)
13
R/W
7:0
0x69
(105°
C)
RHS10:RHS3
R/W
7:5
000
RHS2:RHS0
R
4:0
0x00
[Reserved]
Remote HIGH Setpoint (MSB and LSB)
High setpoint temperature for remote diode. Same format as Unsigned Remote
Temperature Reading (registers 31 and 32) or Signed Remote Temperature
Reading (registers 01 and 10) with the digital filter off. Is it programmable by the
USF bit found in the Enhanced configuration Register.
These bits are not used and always read as 0.
08 (0E)HEX AND 14HEX REMOTE LOW SETPOINT REGISTERS
08 (0E)
14
R/W
7:0
00
(0°C)
RTS10:RTS3
R/W
7:5
000
RTS2:RTS0
Remote LOW Setpoint (MSB and LSB)
Low setpoint temperature for remote diode. Same format as Signed Remote
Temperature Reading (registers 01 and 10) with the digital filter off.
R
4:0
0x00
[Reserved]
These bits are not used and always read as 0.
19HEX REMOTE DIODE T_CRIT SETPOINT REGISTER
19
R/W
7:0
0x6E
(110°
C)
RCS7:RCS0
Remote Diode T_CRIT Setpoint Limit
This 8-bit integer stores the T_CRIT limit and is nominally 110°C. The value of
this register can be locked by setting T_CRIT Limit Override (bit 1) in the
Configuration register to a 0, then programming a new T_CRIT value into this
register. The format of this register is programmable. When the USF bit in the
Enhanced Configuration register is cleared:
LCS7 is the SIGN bit
LCS6 has a bit weight of 64°C
LCS5 has a bit weight of 32°C
LCS4 has a bit weight of 16°C
LCS3 has a bit weight of 8°C
LCS2 has a bit weight of 4°C
LCS1 has a bit weight of 2°C
LCS0 has a bit weight of 1°C
21HEX T_CRIT HYSTERESIS REGISTER
7
21
30
R/W
6:0
RTH7
0x0A
(10°C)
RTH6:RTH0
This bit is unused. OK to write 1 or 0.
Remote Diode T_CRIT Hysteresis
T_CRIT stays activated until the remote diode temperature goes below [(T_CRIT
Limit)—(T_CRIT Hysteresis)].
RTH6 has a bit weight of 64°C
RTH5 has a bit weight of 32°C
RTH4 has a bit weight of 16°C
RTH3 has a bit weight of 8°C
RTH2 has a bit weight of 4°C
RTH1 has a bit weight of 2°C
RTH0 has a bit weight of 1°C
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Address
Hex
SNIS149B – NOVEMBER 2011 – REVISED MARCH 2013
Read/
Write
Bits
POR
Value
Name
Description
BFHEX REMOTE DIODE TEMPERATURE FILTER AND COMPARATOR MODE
R/W
7:6
00
[Reserved]
These bits are unused and always write 0.
R
5:3
000
[Reserved]
These bits are unused and always read as 0.
2:1
BF
00
RDTF1:RDTF0
Remote Diode Temperature Filter Control
00: Filter Disabled
01: Filter Level 2 (minimal filtering, same as 10; Like LM63, LM63 Level 1 not
supported)
10: Filter Level 2 (minimal filtering, same as 01; like LM63, LM63 Level 1 not
supported)
11: Filter Enhanced Level 2 (maximum filtering)
ALT/CMP
Comparator Mode
0: the ALERT pin functions normally.
1: the ALERT pin behaves as a comparator, asserting itself when an ALERT
condition exists, de-asserting itself when the ALERT condition goes away.
R/W
0
0
ALERT Status and Mask Registers
Address
Hex
Read/
Write
Bits
POR
Value
Name
Description
02HEX ALERT STATUS REGISTER (8-bits) (All Alarms are latched until read, then cleared if alarm condition was removed at the
time of the read.)
0x02
7
0
BUSY
Busy
0: the ADC is not converting.
1: the ADC is performing a conversion. This bit does not affect ALERT status.
6
0
LHIGH
Local High Alarm
0: the internal temperature of the LM96063 is at or below the Local High Setpoint.
1: the internal temperature of the LM96063 is above the Local High Setpoint, and
an ALERT is triggered.
5
0
[Reserved]
4
0
RHIGH
Remote High Alarm
0: the temperature of the Remote Diode is at or below the Remote High Setpoint.
1: the temperature of the Remote Diode is above the Remote High Setpoint, and
an ALERT is triggered.
3
0
RLOW
Remote Low Alarm
0: the temperature of the Remote Diode is at or above the Remote Low Setpoint.
1: the temperature of the Remote Diode is below the Remote Low Setpoint, and
an ALERT is triggered.
2
0
RDFA
Remote Diode Fault Alarm
0: the Remote Diode appears to be correctly connected.
1: the Remote Diode may be disconnected or shorted to ground. This Alarm does
not trigger an ALERT or a TCRIT.
RCRIT
Remote T_CRIT Alarm
When this bit is a 0, the temperature of the Remote Diode is at or below the
T_CRIT Limit.
When this bit is a 1, the temperature of the Remote Diode is above the T_CRIT
Limit, ALERT and TCRIT are triggered.
TACH
Tach Alarm
When this bit is a 0, the Tachometer count is lower than or equal to the
Tachometer Limit (the RPM of the fan is greater than or equal to the minimum
desired RPM).
When this bit is a 1, the Tachometer count is higher than the Tachometer Limit
(the RPM of the fan is less than the minimum desired RPM), and an ALERT is
triggered.
R
1
0
0
0
This bit is unused and always read as 0.
16HEX ALERT MASK REGISTER (8-bits)
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Address
Hex
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Read/
Write
Bits
POR
Value
Name
R
7
1
[Reserved]
R/W
6
0
LHAM
R
5
1
[Reserved]
4
0
RHAM
Remote High Alarm Mask
0: Remote High Alarm event will generate an ALERT.
1: a Remote High Alarm event will not generate an ALERT.
3
0
RLAM
Remote Low Alarm Mask
0: a Remote Low Alarm event will generate an ALERT.
1: a Remote Low Alarm event will not generate an ALERT.
2
1
[Reserved]
1
0
RTAM
0
0
TCHAM
Description
This bit is unused and always read as 1.
Local High Alarm Mask
0: a Local High Alarm event will generate an ALERT.
1: a Local High Alarm will not generate an ALERT
This bit is unused and always read as 1.
R/W
16
R
This bit is unused and always read as 1.
Remote T_CRIT Alarm Mask
0: a Remote T_CRIT event will generate an ALERT.
1: a Remote T_CRIT event will not generate an ALERT.
R/W
TACH Alarm Mask
When this bit is a 0, a Tach Alarm event will generate an ALERT.
When this bit is a 1, a Tach Alarm event will not generate an ALERT.
33HEX POWER ON RESET STATUS REGISTER
33
R
7
Power On Reset Status
0: Power On Reset cycle over part ready
1: Power On Reset cycle in progress part not ready
NR
—
6:0
[Reserved]
These bits are unused and will always report 0.
Conversion Rate and One-Shot Registers
Address
Hex
Read/
Write
Bits
POR
Value
Name
Description
04 (0A)HEX CONVERSION RATE REGISTER (8-bits)
R
04 (0A)
R/W
7:4
3:0
[Reserved]
0x08
These bits are unused and will always be set to 0.
CONV3:CONV0
Conversion Rate
Sets the conversion rate of the LM96063.
0000 = 0.05 Hz
0001 = 0.1 Hz
0010 = 0.204 Hz
0011 = 0.406 Hz
0100 = 0.813 Hz
0101 = 1.625 Hz
0110 = 3.25 Hz
0111 = 6.5 Hz
1000 = 13 Hz
1001 = 26 Hz
All other values = 26 Hz
0FHEX ONE-SHOT REGISTER (8-bits)
Write
Only
0F
7:0
N/A
Bits
POR
Value
One Shot Trigger
With the LM96063 in the STANDBY mode a single write to this register will
initiate one complete temperature conversion cycle. Any value may be written.
ID Registers
Address
Hex
Read/
Write
Name
Description
FEHEX MANUFACTURER’S ID REGISTER (8-bits)
FE
R
7:0
0x01
Manufacturer’s ID
0x01 = Texas Instruments
FFHEX STEPPING / DIE REVISION ID REGISTER (8-bits)
FF
32
R
7:0
0x49
Stepping/Die
Revision ID
Version of LM96063
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Application Notes
FAN CONTROL DUTY CYCLE VS. REGISTER SETTINGS AND FREQUENCY
The following table is true only when the 22.5 kHz PWM frequency high resolution duty cycle is not selected.
PWM
Freq at
1.4 kHz
Internal
Clock, Hz
Actual Duty
Cycle, %
When
75% is
Selected
180.0
703.1
50.0
90.00
351.6
75.0
3
60.00
234.4
83.3
4
45.00
175.8
75.0
8
5
36.00
140.6
80.0
12
9
6
30.00
117.2
75.0
14
11
7
25.71
100.4
78.6
6.25
16
12
8
22.50
87.9
75.0
9
5.56
18
14
9
20.00
78.1
77.8
10
5.00
20
15
10
18.00
70.3
75.0
11
4.54
22
17
11
16.36
63.9
77.27
12
4.16
24
18
12
15.00
58.6
75.00
13
3.85
26
20
13
13.85
54.1
76.92
14
3.57
28
21
14
12.86
50.2
75.00
15
3.33
30
23
15
12.00
46.9
76.67
16
3.13
32
24
16
11.25
43.9
75.00
17
2.94
34
26
17
10.59
41.4
76.47
18
2.78
36
27
18
10.00
39.1
75.00
19
2.63
38
29
19
9.47
37.0
76.32
20
2.50
40
30
20
9.00
35.2
75.00
21
2.38
42
32
21
8.57
33.5
76.19
22
2.27
44
33
22
8.18
32.0
75.00
23
2.17
46
35
23
7.82
30.6
76.09
24
2.08
48
36
24
7.50
29.3
75.00
25
2.00
50
38
25
7.20
28.1
76.00
26
1.92
52
39
26
6.92
27.0
75.00
27
1.85
54
41
27
6.67
26.0
75.93
28
1.79
56
42
28
6.42
25.1
75.00
29
1.72
58
44
29
6.21
24.2
75.86
30
1.67
60
45
30
6.00
23.4
75.00
31
1.61
62
47
31
5.81
22.7
75.81
PWM
Freq
4D
[4:0]
Step
Resolution,
%
PWM
Value
4C [5:0]
for 100%
PWM
Value
4C [5:0] for
about 75%
1
50
2
1
1
2
25
4
3
2
3
16.7
6
5
4
12.5
8
6
5
10.0
10
6
8.33
7
7.14
8
0
PWM
Value
4C [5:0]
for 50%
PWM
Freq at
360 kHz
Internal
Clock, kHz
Address 0 is mapped to Address 1
The following table is true only when the 22.5 kHz PWM frequency with high resolution duty cycle is selected by
setting bit 4 (PHR) of the Enhanced Configuration register (0x45), clearing bit 3 (PWCKSL) of the PWM and
RPM Configuration register (0x4A) and setting PWM Frequency (0x4D) register to 0x08.
PWM
Freq
4D
[4:0]
Step
Resolution,
%
PWM
Value
4C [7:0]
for 100%
(Hex)
PWM
Value
4C [7:0] for
about 75%
(Hex)
PWM
Value
4C [7:0]
for 50%
(Hex)
PWM
Freq at
360 kHz
Internal
Clock, kHz
PWM
Freq at
1.4 kHz
Internal
Clock, Hz
Actual Duty
Cycle, %
When
Approximately
75% is
Selected
8
0.392
FF
BF
80
22.50
Not Available
74.902
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Computing Duty Cycles for a Given Frequency
Select a PWM Frequency from the first column corresponding to the desired actual frequency in columns 6 or 7.
Note the PWM Value for 100% Duty Cycle.
Find the Duty Cycle by taking the PWM Value of Register 4C and computing:
DutyCycle _(%) =
PWM _Value
PWM _Value _ for _ 100 %
u 100 %
(1)
Example: For a PWM Frequency of 24, a PWM Value at 100% = 48 and PWM Value actual = 28, then the Duty
Cycle is (28/48) × 100% = 58.3%.
LUT FAN CONTROL
The LM96063 fan control uses a temperature to duty cycle look-up table (LUT) that has 12 indexes. High
resolution duty cycle (0.392%) is available when the PWM frequency is set to 22.5 kHz. In addition ramp rate
control is available to acoustically smooth the duty cycle transition between LUT steps.
Shown in Figure 12 is an example of the 12-point LUT temperature to PWM transfer function that can be realized
without smoothing enabled. The table is comprised of twelve Duty-Cycle and Temperature set-point pairs. Notice
that the transitions between one index of the LUT to the next happen instantaneously. If the PWM levels are set
far enough apart this can be acoustically very disturbing. The typical acoustical threshold of change in duty cycle
is 2%. Figure 13 has an overlaid curve (solid line) showing what occurs at the transitions when smoothing is
enabled. The dashed lines shown in Figure 13 are there to point out that multiple slopes can be realized easily.
At the transitions the duty cycle increments in LSb (0.39% for the case shown) steps. In the example shown in
Figure 13the first pair is set for a duty-cycle of 31.25% and a temperature of 0°C. For temperatures less than 0°C
the duty cycle is set to 0. When the temperature is greater than 0 °C but is less than 91 °C the duty cycle will
remain at 31.25%. The next pair is set at 37.5% and 91°C. Once the temperature exceeds 91°C the duty cycle
on the PWM output will gradually transition from 31.25% to 37.5% in 0.39% steps at the programmed time
interval. The LUT comparison temperature resolution is programmable to either 1 °C or 0.5 °C. For the curves of
Fan Control Transfer Function Example the comparison resolution is set to 0.5 °C that is why the actual duty
cycle transitions happen 0.5 °C higher than the actual LUT entry. The duty cycle transition time interval is
programmable and is shown in the table titled Table 8. Care should be taken so that the LUT PWM and
Temperature values are setup in ascending weight.
100
93.75
87.5
81.25
75
68.75
62.5
56.25
50
43.75
37.5
31.25
25
18.75
12.5
6.25
0
85
12-point LUT
Entry
PWM DUTY CYCLE (%)
PWM DUTY CYCLE (%)
Fan Control Transfer Function Example
PWM Output
Transition
90
95
100
105
110
100
93.75
87.5
81.25
75
68.75
62.5
56.25
50
43.75
37.5
31.25
25
18.75
12.5
6.25
0
TEMPERATURE (°C)
85
Multiple slopes
easily realizable
with 12-point LUT
Ramp rate control
between transitions
has 0.39% step size
90
95
100
105
110
TEMPERATURE (°C)
Figure 12. Without smoothing
Figure 13. With smoothing
Also included is programmable hysteresis that is not described by the curves of Fan Control Transfer Function
Example. The hysteresis takes effect as temperature is decreasing and moves all the temperature set-points
down by the programmed amount. For the example shown here if the hysteresis is set to 1°C and if the
temperature is decreasing from 96.5°C the duty cycle will remain at 68.75% and will not transition to 62.5% until
the temperature drops below 95.5°C.
34
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If at any time the TCRIT output were to activate the PWM duty cycle will be instantaneously forced to 100% thus
forcing the fans to full on.
Table 8. PWM Smoothing Time Intervals
0-100% DC Time
Time Interval
(seconds)
w/ 6.25% resolution
(seconds)
w/ 0.39% resolution
Seconds
0.182
2.913
43.7
0.091
1.456
21.6
0.046
0.728
10.9
0.023
0.364
5.45
The Table 8 table describes the programmable time interval preventing abrupt changes in the PWM output duty
cycle and thus preventing abrupt acoustical noise changes as well. The threshold of acoustically detecting fan
noise transition is at about a 2% duty cycle change. The table describes the time intervals that can be
programmed and the total amount of time it will take for the PWM output to change from 0% to 100% for each
time interval. For example if the time interval for each step is set to 0.091 seconds the time it will take to make a
0 to 100% duty cycle change will be 21.6 seconds when the duty cycle resolution is set to 0.39% or 1.46
seconds when the resolution is 6.25%. One setting will apply to all LUT transitions.
COMPUTING RPM OF THE FAN FROM THE TACH COUNT
The Tach Count Registers 46HEX and 47HEX count the number of periods of the 90 kHz tachometer clock in the
LM96063 for the tachometer input from the fan assuming a 2 pulse per revolution fan tachometer, such as the
fans supplied with the Intel boxed processors. The RPM of the fan can be computed from the Tach Count
Registers 46HEX and 47HEX. This can best be shown through an example.
Example:
Given: the fan used has a tachometer output with 2 per revolution.
Let:
Register 46 (LSB) is BFHEX = Decimal (11 x 16) + 15 = 191 and
Register 47 (MSB) is 7HEX = Decimal (7 x 256) = 1792.
The total Tach Count, in decimal, is 191 + 1792 = 1983.
The RPM is computed using the formula
f u 5, 400 , 000
Fan _ RPM =
,
Total _ Tach _ Count _( Decimal )
where
•
•
•
f = 1 for 2 pulses/rev fan tachometer output;
f = 2 for 1 pulse/rev fan tachometer output, and
f = 2 / 3 for 3 pulses/rev fan tachometer output
(2)
For our example
Fan _ RPM =
1 u 5, 400 , 000
= 2723 _ RPM
1983
(3)
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DIODE NON-IDEALITY
The LM96063 can be applied easily in the same way as other integrated-circuit temperature sensors, and its
remote diode sensing capability allows it to be used in new ways as well. It can be soldered to a printed circuit
board, and because the path of best thermal conductivity is between the die and the pins, its temperature will
effectively be that of the printed circuit board lands and traces soldered to the LM96063's pins. This presumes
that the ambient air temperature is almost the same as the surface temperature of the printed circuit board; if the
air temperature is much higher or lower than the surface temperature, the actual temperature of the LM96063 die
will be at an intermediate temperature between the surface and air temperatures. Again, the primary thermal
conduction path is through the leads, so the circuit board temperature will contribute to the die temperature much
more strongly than will the air temperature.
The LM96063 incorporates remote diode temperature sensing technology allowing the measurement of remote
temperatures. This diode can be located on the die of a target IC, allowing measurement of the IC's temperature,
independent of the LM96063's die temperature. A discrete diode can also be used to sense the temperature of
external objects or ambient air. Remember that a discrete diode's temperature will be affected, and often
dominated, by the temperature of its leads. Most silicon diodes do not lend themselves well to this application. It
is recommended that an MMBT3904 transistor base emitter junction be used with the collector tied to the base.
The LM96063 can measure a diode-connected transistor such as the MMBT3904 or the thermal diode found in
an AMD processor or any other device (ASIC, CPU or FPGA) built on an SOI process accurately.
Diode Non-Ideality Factor Effect on Accuracy
When a transistor is connected as a diode, the following relationship holds for variables VBE, T and IF:
ª § VBE · º
« K x Vt ¹-1»
IF = IS x «¬e©
»¼
where
•
•
•
•
•
•
•
•
kT
Vt = q
(5)
−19
q = 1.6×10 Coulombs (the electron charge),
T = Absolute Temperature in Kelvin
k = 1.38×10−23 joules/K (Boltzmann's constant),
η is the non-ideality factor of the process the diode is manufactured on,
IS = Saturation Current and is process dependent,
If = Forward Current through the base-emitter junction
VBE = Base-Emitter Voltage drop
(5)
In the active region, the -1 term is negligible and may be eliminated, yielding the following equation
IF = IS x
ª §KVxBEV ·º
«e© t¹»
«
»
¬
¼
(6)
In Equation 6, η and IS are dependant upon the process that was used in the fabrication of the particular diode.
By forcing two currents with a very controlled ratio(IF2 / IF1) and measuring the resulting voltage difference, it is
possible to eliminate the IS term. Solving for the forward voltage difference yields the relationship:
IF2
kT
'VBE = K x § q · x ln § I ·
F1
© ¹
© ¹
(7)
Solving Equation 7 for temperature yields:
q x 'VBE
T=
§ IF2 ·
K x k x ln ¨¨
¸
© IF1 ¹
36
(8)
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Equation 8 holds true when a diode connected transistor such as the MMBT3904 is used. When this “diode”
equation is applied to an integrated diode such as a processor transistor with its collector tied to GND as shown
in Figure 14 it may yield a wide non-ideality spread. This wide non-ideality spread is not due to true process
variation but due to the fact that Equation 8 is an approximation.
2
IE = IF
D+
100 pF
3
PROCESSOR
D-
LM96063
IC IR
IF
MMBT3904
2
D+
100 pF
3
IR
D-
LM96063
Figure 14. Thermal Diode Current Paths
Calculating Total System Accuracy
The voltage seen by the LM96063 also includes the IFRS voltage drop of the series resistance. The non-ideality
factor, η, is the only other parameter not accounted for and depends on the diode that is used for measurement.
Since ΔVBE is proportional to both η and T, the variations in η cannot be distinguished from variations in
temperature. Since the non-ideality factor is not controlled by the temperature sensor, it will directly add to the
inaccuracy of the sensor. As an example, assume a temperature sensor has an accuracy specification of ±1.0°C
at a temperature of 80°C (353 Kelvin) and the processor diode has a non-ideality variation of ±0.39%. The
resulting system accuracy of the processor temperature being sensed will be:
TACC = ±0.75°C + (±0.39% of 353 K) = ± 2.16 °C
(9)
The next error term to be discussed is that due to the series resistance of the thermal diode and printed circuit
board traces. The thermal diode series resistance is specified on most processor data sheets and is in the range
of several ohms. The LM96063 does not need to be compensated for series resistance errors if the manufacturer
of the thermal diode says that the diode they provide matches the performance of an MMBT3904. If they provide
a typical series resistance number that does not have to be compensated for because it is taken into account.
The error that is not accounted for is the spread of the processor's series resistance and additional PCB trace
resistance. The equation used to calculate the temperature error (TER) due to thermal diode series resistance
variation is simply:
ºC ·
§
TER = ¨0.62 : ¸ x RPCB
©
¹
(10)
Solving Equation 10 for RPCB equal to -1.5Ω to 2.5Ω results in the additional error due to the spread in this series
resistance of -0.93°C to +1.55°C. The spread in error cannot be canceled out, as it would require measuring
each individual thermal diode device. This is quite difficult and impractical in a large volume production
environment.
Equation 10 can also be used to calculate the additional error caused by series resistance on the printed circuit
board. Since the variation of the PCB series resistance is minimal, the bulk of the error term is always positive
and can simply be cancelled out by subtracting it from the output readings of the LM96063 using the Remote
Temperature Offset register.
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PCB LAYOUT FOR MINIMIZING NOISE
Figure 15. Ideal Diode Trace Layout
In a noisy environment, such as a processor mother board, layout considerations are very critical. Noise induced
on traces running between the remote temperature diode sensor and the LM96063 can cause temperature
conversion errors. Keep in mind that the signal level the LM96063 is trying to measure is in microvolts. The
following guidelines should be followed:
1. Use a low-noise +3.3VDC power supply, and bypass to GND with a 0.1 µF ceramic capacitor in parallel with
a 100 pF ceramic capacitor. The 100 pF capacitor should be placed as close as possible to the power supply
pin. A bulk capacitance of 10 µF needs to be in the vicinity of the LM96063's VDD pin.
2. A 100 pF diode bypass capacitor is recommended to filter high frequency noise but may not be necessary.
Place the recommended 100 pF diode capacitor as close as possible to the LM96063's D+ and D− pins.
Make sure the traces to the 100 pF capacitor are matched. The LM96063 can handle capacitance up to 3 nF
placed between the D+ and D- pins, See Figure 3 in Typical Performance Characteristics.
3. Ideally, the LM96063 should be placed within 10 cm of the Processor diode pins with the traces being as
straight, short and identical as possible. Trace resistance of 1 Ω can cause as much as 0.62°C of error. This
error can be compensated by using the Remote Temperature Offset Registers, since the value placed in
these registers will automatically be subtracted from or added to the remote temperature reading.
4. Diode traces should be surrounded by a GND guard ring to either side, above and below if possible. This
GND guard should not be between the D+ and D− lines. In the event that noise does couple to the diode
lines it would be ideal if it is coupled common mode. That is equally to the D+ and D− lines.
5. Avoid routing diode traces in close proximity to power supply switching or filtering inductors.
6. Avoid running diode traces close to or parallel to high speed digital and bus lines. Diode traces should be
kept at least 2 cm apart from the high speed digital traces.
7. If it is necessary to cross high speed digital traces, the diode traces and the high speed digital traces should
cross at a 90 degree angle.
8. The ideal place to connect the LM96063's GND pin is as close as possible to the Processor's GND
associated with the sense diode.
9. Leakage current between D+ and GND should be kept to a minimum. Thirteen nano-amperes of leakage can
cause as much as 0.2°C of error in the diode temperature reading. Keeping the printed circuit board as clean
as possible will minimize leakage current.
Noise coupling into the digital lines greater than 400 mVp-p (typical hysteresis) and undershoot less than 500 mV
below GND, may prevent successful SMBus communication with the LM96063. SMBus no acknowledge is the
most common symptom, causing unnecessary traffic on the bus. Although the SMBus maximum frequency of
communication is rather low (100 kHz max), care still needs to be taken to ensure proper termination within a
system with multiple parts on the bus and long printed circuit board traces. An RC lowpass filter with a 3 dB
corner frequency of about 40 MHz is included on the LM96063's SMBCLK input. Additional resistance can be
added in series with the SMBDAT and SMBCLK lines to further help filter noise and ringing. Minimize noise
coupling by keeping digital traces out of switching power supply areas as well as ensuring that digital lines
containing high speed data communications cross at right angles to the SMBDAT and SMBCLK lines.
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REVISION HISTORY
Changes from Revision A (March 2013) to Revision B
•
Page
Changed layout of National Data Sheet to TI format .......................................................................................................... 38
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PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
LM96063CISD/NOPB
ACTIVE
WSON
DSC
10
1000
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 85
T63S
LM96063CISDX/NOPB
ACTIVE
WSON
DSC
10
4500
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 85
T63S
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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