LM96080
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SNAS465D – SEPTEMBER 2009 – REVISED MARCH 2013
LM96080 System Hardware Monitor with 2-Wire Serial Interface
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FEATURES
DESCRIPTION
•
•
LM96080, compatible to LM80, is a hardware monitor
that contains a 10-bit delta-sigma ADC capable of
measuring 7 positive voltages and local temperature.
The LM96080 also measures the speed of two fans
and includes other hardware monitoring on an I2C®
interface. The LM96080 includes a sequencer that
performs WATCHDOG window comparisons of all
measured values and its interrupt outputs become
active when any values exceed the programmed
limits.
1
2
•
•
•
•
•
•
•
•
•
Local Temperature Sensing
7 Positive Voltage Inputs with 10-bit
Resolution
2 Programmable Fan Speed Monitoring Inputs
2.5 mV LSb and 2.56V Input Range
Chassis Intrusion Detector Input
WATCHDOG Comparison of All Monitored
Values
Separate Input to Show Status in Interrupt
Status Register of Additional External
Temperature Sensors Such as the LM26/27,
LM56/57, LM73, or LM75
I2C Serial Bus Interface Compatibility,
Supports Standard Mode, 100 kbits/s, and Fast
Mode, 400 kbits/s
Shutdown Mode to Minimize Power
Consumption
Programmable RST_OUT/OS Pin: RST_OUT
Provides a Reset Output; OS Provides an
Interrupt Output Activated by an
Overtemperature Shutdown Event
Software and Pin Compatible with the LM80
APPLICATIONS
•
•
•
•
Communications Infrastructure
System Thermal and Hardware Monitoring for
Servers
Electronic Test Equipment and
Instrumentation
Office Electronics
The LM96080 is especially suited to interface to both
linear and digital temperature sensors. The 2.5 mV
LSb (least significant bit) and 2.56 volt input range is
ideal for accepting inputs from a linear sensor such
as the LM94022. The BTI is used as an input from
either digital or thermostat sensors such as LM73,
LM75, LM56, LM57, LM26, LM27, LM26LV, or other
LM96080.
The LM96080 supports Standard Mode (Sm, 100
kbits/s) and Fast Mode (Fm, 400 kbits/s) I2C interface
modes of operation. LM96080 includes an analog
filter on the I2C digital control lines that allows
improved noise immunity and supports TIMEOUT
reset function on SDA and SCL that prevents I2C bus
lockup. Three I2C device address pins allow up to 8
parts on a single bus.
The LM96080's 3.0V to 5.5V supply voltage range,
low supply current, and I2C interface make it ideal for
a wide range of applications. Operation is ensured
over the temperature range of (−40)°C ≤ TA ≤
+125°C. The LM96080 is available in a 24-pin
TSSOP package.
KEY SPECIFICATIONS
•
•
•
•
•
•
•
•
Total Unadjusted Error ±1 %FS (Max)
Differential Non-Linearity ±1 Lsb (Max)
Supply Voltage Range +3.0 V to +5.5 V
Supply Current (Operating) 0.370 mA Typ
Supply Current (Shutdown) 0.330 mA Typ
ADC Resolution 10 Bits
Temperature Resolution 0.5°C/0.0625°C
Temperature Accuracy ±3°C (Max)
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 © 2009–2013, Texas Instruments Incorporated
LM96080
SNAS465D – SEPTEMBER 2009 – REVISED MARCH 2013
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Typical Application
LM96080
Positive
Voltage
Analog
Inputs
Negative
Voltage
V
LM75
Temperature
Sensor
IN0
IN1
IN2
IN3
IN4
IN5
IN6
10-bit
Sigma-Delta
ADC
+
Temperature
Sensor
INT
RST_OUT / OS
Interrupt
Masking
and
Interrupt
Control
Limit
Registers and
WATCHDOG
Comparators
Interrupt
Outputs
BTI
GPI(CI)
Chassis
Intrusion
Detector
INT_IN
Fan Speed
Counter
Serial Bus
Interface
SDA
SCL
A0/NTEST_OUT
A1
A2
GPO
General Purpose Output
(Power Switch Bypass#)
Interface and Control
Connection Diagram
2
A2
INT_IN
1
24
SDA
2
23
A1
SCL
3
22
A0/NTEST_OUT
FAN1
4
21
IN0
FAN2
5
20
IN1
BTI
6
19
IN2
GPI (CI)
7
18
IN3
GND
8
17
IN4
V+
9
16
IN5
INT
10
15
IN6
GPO
11
14
GNDA
NTEST_IN/RESET_IN
12
13
RST_OUT/OS
LM96080
24-TSSOP
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PIN DESCRIPTIONS
Pin
Number
Pin
Name(s)
ESD
Structure
1
INT_IN
Digital Input
2
SDA
Digital I/O
3
SCL
Digital Input
Serial Bus Clock.
4-5
FAN1, FAN2
Digital Inputs
Fan tachometer inputs.
6
BTI
Digital Input
Board Temperature Interrupt driven by Overtemperature
Shutdown (O.S.) outputs of additional temperature sensors
such as LM75. This pin provides internal pull-up of 10 kΩ.
7
GPI (Chassis
Intrusion)
Digital I/O
General Purpose Input pin. GPI can be used as an
additional active high interrupt input pin or as an active high
input from an external circuit which latches a Chassis
Intrusion event.
8
GND
GROUND
Internally connected to all of the digital circuitry.
9
V+
10
INT
11
GPO (Power
Switch
Bypass)
ESD
Clamp
Type
Description
Interrupt Input Bar. This is an active low input that
propagates the INT_IN signal to the INT output of the
LM96080.
Serial Bus Bidirectional Data. NMOS open-drain output.
POWER
+3.0V to +5.5V power. Bypass with the parallel combination
of 10 μF (electrolytic or tantalum) and 0.1 μF (ceramic)
bypass capacitors.
Digital Output
Non-Maskable Interrupt (Active High, PMOS, open-drain) or
Interrupt Request (Active Low, NMOS, open-drain).
Whenever INT_IN, BTI, or GPI interrupts, this output pin
becomes active.
Digital Output
General Purpose Output pin is an active low NMOS open
drain output intended to drive an external power PMOS for
software power control or can be utilized to control power
to a cooling fan.
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PIN DESCRIPTIONS (continued)
4
Pin
Number
Pin
Name(s)
ESD
Structure
12
NTEST_IN/
RESET_IN
Digital Input
An active-low input that enables NAND Tree board-level
connectivity testing. Whenever NAND Tree connectivity is
enabled, the LM96080 resets to its power on state.
13
RST_OUT/O
S
Digital Output
This pin is an NMOS open drain output. RST_OUT
provides a master reset to devices connected to this line.
OS is dedicated to the temperature reading WATCHDOG.
Internally connected to all analog circuitry. The ground
reference for all analog inputs. This pin needs to be taken
to a low noise analog ground plane for optimum
performance.
Type
14
GNDA
GROUND
15-21
IN6-IN0
Analog Inputs
22
A0/NTEST_O
UT
Digital I/O
23-24
A1-A2
Digital Inputs
Description
0V to 2.56V full scale range Analog Inputs.
The lowest order bit of the Serial Bus Address. This pin
also functions as an output when doing a NAND Tree test.
The two highest order bits of the Serial Bus Address.
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Block Diagram
Analog
Inputs
IN0
IN1
IN2
IN3
IN4
IN5
IN6
21
20
19
18
17
16
15
Value RAM
Watchdog
IN0
Addr=20h
Upper Limit
IN1
Addr=21h
Upper Limit
IN2
Addr=22h
Upper Limit
IN3
Addr=23h
Upper Limit
IN4
Addr=24h
Upper Limit
IN5
Addr=25h
Upper Limit
IN6
Addr=26h
Upper Limit
Temperature
Addr=27h
Hysteresis
SigmaDelta
ADC and
MUX
Temperature
Sensor
0V to
2.56V
Analog
Input
Range
10-bit
2.5 mV
LSb
Lower Limit
INT
10
Lower Limit
Interrupt
Outputs
Lower Limit
RST_OUT/
13
OS
Lower Limit
Lower Limit
Lower Limit
Lower Limit
OS
Interrupt
Status
Registers
Interrupt
Masking
and
Interrupt
Control
Hot
Hysteresis
Fan FAN1
Tach
Pulse
Inputs FAN2
INT_IN
GPI(CI)
BTI
4
Fan Speed Counter
Fan 1
Addr = 28h
Upper Limit
Fan Speed Counter
Fan 2
Addr=29h
Upper Limit
5
1
7
6
LM96080
12
INTERFACE and CONTROL
NTEST_IN /
Reset_IN
GPO
Digital
Inputs
and
Outputs
11
3
2
SCL SDA
22
23
A0/
A1
NTEST_OUT
24
A2
Serial Bus Interface
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.
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Absolute Maximum Ratings (1) (2) (3)
Supply Voltage (V+)
6.0V
Voltage on SCL, SDA, RST_OUT/OS, GPI (CI), GPO, NTEST_IN/RESET_IN, INT_IN, FAN1 and
FAN2
(GND - GNDA)
±300 mV
Input Current at Any Pin (4)
±5 mA
Package Input Current (4)
±30 mA
Maximum Junction Temperature (TJ max)
ESD Susceptibility (5)
(−0.3)V to +6.0V
(−0.3)V to (V+ + 0.3V) and ≤ 6.0V
Voltage on Other Pins
150°C
Human Body Model
Machine Model
Charged Device Model
Storage Temperature
3000V
300V
1000V
(−65)°C to +150°C
For soldering specifications, see http://www.ti.com/lit/SNOA549 (6)
(1)
(2)
(3)
(4)
(5)
(6)
All voltages are measured with respect to GND, unless otherwise specified
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 specific 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.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
When the input voltage (VIN) at any pin exceeds the power supplies (VIN< (GND or GNDA) or VIN>V +), the current at that pin should be
limited to 5 mA. The 30 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies
with an input current of 5 mA to six pins. Parasitic components and/or ESD protection circuitry are shown in the Pin Descriptions table.
Human body model (HBM) is a charged 100 pF capacitor discharged into a 1.5 kΩ resistor. Machine model (MM), is a charged 200 pF
capacitor 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.
Reflow temperature profiles are different for packages containing lead (Pb) than for those that do not..
Operating Ratings (1) (2)
Supply Voltage (V+)
+3.0V to +5.5V
Voltage on SCL, SDA, RST_OUT/OS, GPI (CI), GPO,
NTEST_IN/RESET_IN, INT_IN, FAN1 and FAN2
(−0.05)V to +5.5V
(−0.05)V to (V+ + 0.05)V and ≤ 5.5V
Voltage on Other Pins
|GND − GNDA|
≤ 100 mV
(−0.05)V to (V+ + 0.05)V
VIN Voltage Range
Temperature Range for Electrical Characteristics
(−40)°C ≤ TA ≤ +125°C
Operating Temperature Range
(−40)°C ≤ TA ≤ +125°C
Junction to Ambient Thermal Resistance (θJA (3) )
Package Number: PW
(1)
(2)
(3)
6
95°C/W
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 specific 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 specified
The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax, θJA and the ambient temperature,
TA. The maximum allowable power dissipation at any temperature is PD = (TJmax−T A)/θJA.
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DC Electrical Characteristics
The following specifications apply for +3.0 VDC ≤ V+ ≤ +5.5 VDC , IN0-IN6, RS = 25Ω, unless otherwise specified. Boldface
limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. (1)
Symbol
Parameter
Conditions
Typical (2)
Limits (3)
Units
(Limits)
POWER SUPPLY CHARACTERISTICS
V+
Supply Voltage
+3.3
+5.0
+3.0
+5.5
V (min)
V(max)
I+
Supply Current (Interface Inactive). (See SUPPLY Round robin conversion, V+=
CURRENT (I+) for the I+ equation).
5.5V
0.430
0.580
mA (max)
Round robin conversion, V+=
3.8V
0.370
0.520
mA (max)
Shutdown mode, V+= 5.5V
0.400
0.540
mA (max)
0.330
0.480
mA (max)
±3
±2
°C (max)
°C (max)
0.0625
°C (min)
±1
% (max)
±1
LSb (max)
+
Shutdown mode, V = 3.8V
TEMPERATURE-to-DIGITAL CONVERTER CHARACTERISTICS
(−40)°C ≤ TA ≤ +125°C
(−25)°C ≤ TA ≤ +100°C
Temperature Error
Resolution
ANALOG-to-DIGITAL CONVERTER CHARACTERISTICS
n
Resolution (10 bits with full-scale at 2.56V)
2.5
TUE
Total Unadjusted Error
See (4)
DNL
Differential Non-Linearity
See (5)
PSS
Power Supply Sensitivity
tC
mV
±0.05
Total Monitoring Cycle Time
See
(6)
%/V
728
662
810
ms (min)
ms (max)
2
10
kΩ (max)
MULTIPLEXER/ADC INPUT CHARACTERISTICS
RON
On Resistance
ION
Input Current (On Channel Leakage Current)
±0.005
μA
IOFF
Off Channel Leakage Current
±0.005
μA
FAN RPM-to-DIGITAL CONVERTER
Fan RPM Error
(–40)°C ≤ TA ≤ +125°C
Internal Clock Frequency
(–40)°C ≤ TA ≤ +125°C
22.5
FAN1 and FAN2 Nominal Input
RPM (See FAN INPUTS)
Divisor = 1, Fan Count = 153 (7)
8800
RPM
Divisor = 2, Fan Count = 153 (7)
4400
RPM
Divisor = 3, Fan Count = 153 (7)
2200
RPM
(7)
1100
Divisor = 4, Fan Count = 153
Full-scale Count
±10
% (max)
20.2
24.8
kHz (min)
kHz (max)
RPM
255
(max)
DIGITAL OUTPUTS: A0/NTEST_OUT, INT
VOUT(1)
Logical “1” Output Voltage
IOUT = +5.0 mA at V+ = +4.5V,
IOUT = +3.0 mA at V+ = +3.0V
2.4
V (min)
VOUT(0)
Logical “0” Output Voltage
IOUT = +5.0 mA at V+ = +4.5V,
IOUT = +3.0 mA at V+ = +3.0V
0.4
V (max)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Each input and output is protected by an ESD structure to GND, as shown in the Pin Descriptions table. Input voltage magnitude up to
0.3V above V+ or 0.3V below GND will not damage the LM96080. There are parasitic diodes that exist between some inputs and the
power supply rails. Errors in the ADC conversion can occur if these diodes are forward biased by more than 50 mV. As an example, if
V+ is 4.50 VDC, input voltage must be ≤ 4.55 VDC, to ensure accurate conversions.
Typicals are at TJ= TA= 25°C and represent most likely parametric norm.
Limits are specified to TI's AOQL (Average Outgoing Quality Level).
TUE (Total Unadjusted Error) includes Offset, Gain and Linearity errors of the ADC.
Limit is Specified by Design.
Total Monitoring Cycle Time includes temperature conversion, 7 analog input voltage conversions and 2 tachometer readings. For more
information on the conversion rates, refer to the description of bit 0, register 07h in REGISTERS AND RAM.
The total fan count is based on 2 pulses per revolution of the fan tachometer output.
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DC Electrical Characteristics (continued)
The following specifications apply for +3.0 VDC ≤ V+ ≤ +5.5 VDC , IN0-IN6, RS = 25Ω, unless otherwise specified. Boldface
limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C.(1)
Symbol
Parameter
Typical (2)
Conditions
Limits (3)
Units
(Limits)
0.4
V (min)
0.005
1
μA (max)
22.5
10
ms (min)
0.4
V (min)
1
μA (max)
OPEN DRAIN OUTPUTS: GPO, RST_OUT / OS, GPI (CI)
VOUT(0)
Logical “0” Output Voltage
IOUT = +5.0 mA at V+ = +4.5V,
IOUT = +3.0 mA at V+ = +3.0V
IOH
High Level Output Current
VOUT = V+
RST_OUT/OS, GPI (CI) Pulse Width
OPEN DRAIN SERIAL BUS OUTPUT: SDA
VOUT(0)
IOH
Logical “0” Output Voltage
High Level Output Current
IOUT = +3.0 mA at V+ = +3.0V
+
VOUT = V
0.005
DIGITAL INPUTS: A0/NTEST_Out, A1-A2, BTI, GPI (Chassis Intrusion), INT_IN, and NTEST_IN / Reset_IN
VIN(1)
Logical “1” Input Voltage
2.0
V (min)
VIN(0)
Logical “0” Input Voltage
0.8
V (max)
VHYST
Hysteresis Voltage
V+ = +3.3V
0.23
V
V+ = +5.5V
0.33
V
SERIAL BUS INPUTS (SCL, SDA)
VIN(1)
Logical “1” Input Voltage
0.7 × V+
V (min)
VIN(0)
Logical “0” Input Voltage
0.3 × V+
V (max)
VHYST
Hysteresis Voltage
V+ = +3.3V
+
V = +5.5V
0.67
V
1.45
V
FAN TACH PULSE INPUTS (FAN1, FAN2)
VIN(1)
Logical “1” Input Voltage
0.7 × V+
V (min)
VIN(0)
Logical “0” Input Voltage
0.3 × V+
V (max)
VHYST
Hysteresis Voltage
V+ = +3.3V
0.35
V
V+ = +5.5V
0.5
V
ALL DIGITAL INPUTS Except for BTI
IIN(1)
Logical “1” Input Current
VIN = V+
−0.005
−1
μA (min)
IIN(0)
Logical “0” Input Current
VIN = 0 VDC
0.005
1
μA (max)
CIN
Digital Input Capacitance
20
pF
BTI Digital Input
8
IIN(1)
Logical “1” Input Current
VIN = V+
−1
−10
μA (min)
IIN(0)
Logical “0” Input Current
VIN = 0 VDC, V+= +5.5 V
1
2
mA
CIN
Digital Input Capacitance
20
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AC Electrical Characteristics
The following specifications apply for +3.0 VDC ≤ V+ ≤ +5.5 VDC , unless otherwise specified. Boldface limits apply for TA =
TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. (1)
Symbol
Parameter
Conditions
Typical (2)
Limits (3)
Units
(Limits)
SERIAL BUS TIMING CHARACTERISTICS
t1
SCL (Clock) Period
2.5
100
μs (min)
μs (max)
t2
Data In Setup Time to SCL High
100
ns (min)
t3
Data Out Stable After SCL Low
0
ns (min)
t4
SDA Low Setup Time to SCL Low (start)
100
ns (min)
t5
SDA High Hold Time After SCL High (stop)
100
ns (min)
25
35
ms (min)
ms (max)
tTIMEOUT
(1)
(2)
(3)
2
SCL or SDA time low for I C bus reset
tRSDA
Minimum NTEST_IN/Reset_IN rising edge to SDA falling edge
2
μs
tRSCL
Minimum NTEST_IN/Reset_IN rising edge to SCL falling edge
13
μs
Timing specifications are tested at the Serial Bus Input logic levels, VIN(0) = 0.3 × V+ for a falling edge and VIN(1) = 0.7 × V+ for a rising
edge when the SCL and SDA edge rates are similar.
Typicals are at TJ= TA= 25°C and represent most likely parametric norm.
Reflow temperature profiles are different for packages containing lead (Pb) than for those that do not..
Figure 1. Serial Bus Timing Diagram
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Typical Performance Characteristics
The following specifications apply for +3.0 VDC ≤ V+ ≤ +5.5 VDC , unless otherwise specified. Boldface limits apply for TA =
TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. (1)
I+ vs. V+ (Voltage Conversion)
1.330
0.418
1.290
0.396
1.250
I+ (mA)
I+ (mA)
I+ vs. V+
0.440
0.374
0.352
0.330
2.5
1.210
1.170
3.0
3.5
4.0
4.5
5.0
1.130
2.5
5.5
4.0
Figure 2.
Figure 3.
I+ vs. V+ (Temperature Conversion)
4.5
5.0
5.5
5.0
5.5
I+ vs. V+ (Shutdown)
0.400
1.596
0.382
1.532
0.364
I+ (mA)
I+ (mA)
3.5
V+ (V)
1.660
1.468
1.404
1.340
2.5
3.0
V+ (V)
0.346
0.328
3.0
3.5
4.0
4.5
5.0
0.310
2.5
5.5
3.0
3.5
V+ (V)
4.0
4.5
V+ (V)
Figure 4.
Figure 5.
TUE
Temperature Accuracy
0.800
0.040
TEMPERATURE ACCURACY (°C)
0.600
TUE (% of FS)
0.018
-0.004
-0.026
-0.048
-0.070
0.0
220.0
440.0
660.0
880.0
0.400
0.200
-2.776E-16
1.1k
CODE
10
-0.400
-0.600
-0.800
-1.000
-1.200
-1.400
-1.600
2.5
3.0
3.5
4.0
4.5
5.0
5.5
V+ (V)
Figure 6.
(1)
-0.200
Figure 7.
Timing specifications are tested at the Serial Bus Input logic levels, VIN(0) = 0.3 × V+ for a falling edge and VIN(1) = 0.7 × V+ for a rising
edge when the SCL and SDA edge rates are similar.
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FUNCTIONAL DESCRIPTION
GENERAL DESCRIPTION
The LM96080 provides 7 analog inputs, a temperature sensor, a delta-sigma ADC (Analog-to-Digital Converter),
2 fan speed counters, WATCHDOG registers, and a variety of inputs and outputs on a single chip. A two wire
Serial Bus interface is also provided. The LM96080 can perform power supply, temperature and fan monitoring
for a variety of computer systems. The LM96080 is pin and software backwards compatible with the LM80.
The LM96080 continuously converts analog inputs to 10-bit resolution with a 2.5 mV LSb (Least Significant bit)
weighting, yielding input ranges of 0 to 2.56V. The Analog Inputs, IN0 - IN6, are intended to be connected to the
several power supplies present in a typical communications infrastructure system. Temperature can be converted
to a 9-bit or 12-bit two's complement word with resolutions of 0.5°C LSb or 0.0625°C LSb, respectively.
Fan inputs can be programmed to accept either fan failure indicator or tachometer signals. Fan failure signals
can be programmed to be either active high or active low. Fan inputs measure the period of tachometer pulses
from the the fans, providing a higher count for lower fan speeds. The fan inputs are digital inputs with transition
levels according to the Fan Tach Pulse Inputs in the Electrical Characteristics table. Full scale fan counts are 255
(8-bit counter), which represent a stopped or very slow fan. Nominal speeds, based on a count of 153, are
programmable from 1100 to 8800 RPM. Signal conditioning circuitry is included to accommodate slow rise and
fall times.
The LM96080 provides a number of internal registers. These include:
• Configuration Register: Provides control and configuration.
• Interrupt Status Registers: Two registers to provide status of each WATCHDOG limit or Interrupt event.
• Interrupt Mask Registers: Allows masking of individual Interrupt sources, as well as separate masking for
each of both hardware Interrupt outputs.
• Fan Divisor/RST_OUT/OS Registers: Bits 0-5 of this register contain the divisor bits for FAN1 and FAN2
inputs. Bits 6-7 control the function of the RST_OUT/OS output.
• OS Configuration/Temperature Resolution Register: The configuration of the OS (Overtemperature
Shutdown) is controlled by the lower 3 bits of this register. Bit 3 enables 12-bit temperature conversions. Bits
4-7 reflect the lower four bits of the temperature reading for a 12-bit resolution.
• Conversion Rate Register: Controls the conversion rate of the round robin cycle to either continuous or 728
ms.
• Voltage/Temperature Channel Disable Register: Allows voltage inputs and the local temperature
conversion to be disabled.
• Value RAM: The monitoring results: temperature, voltages, fan counts, and Fan Divisor/RST_OUT/OS
Register limits are all contained in the Value RAM. The Value RAM consists of a total of 32 bytes. The first 10
bytes are all of the results, the next 20 bytes are the Watchdog Register limits, and the last two bytes are at
the upper locations for Manufacturers ID and Device Stepping/Die Revision ID.
The LM96080 is compatible with Standard Mode (Sm, 100 kbits/s) and Fast Mode (Fm, 400 kbits/s) I2C interface
modes of operation. LM96080 includes an analog filter on the I2C digital control lines that allows improved noise
immunity and supports TIMEOUT reset function on SDA and SCL that prevents I2C bus lockup. Three address
pins, A0 - A2, allow up to 8 parts on a single bus.
When enabled, the LM96080 starts by cycling through each measurement in sequence, and it continuously loops
through the sequence based on the Conversion Rate Register (address 07h) setting. Each measured value is
compared to values stored in WATCHDOG, or Limit Registers (addresses 2Ah - 2Dh). When the measured value
violates the programmed limit, the LM96080 will set a corresponding Interrupt in the Interrupt Status Registers
(addresses 01h - 02h).
Two output Interrupt lines, INT and RST_OUT/OS, are available. INT is fully programmable with masking of each
Interrupt source, and masking of each output. RST_OUT/OS is dedicated to the temperature reading
WATCHDOG registers. In addition, the Fan Divisor register has control bits to enable or disable the hardware
Interrupts.
Additional digital inputs are provided for daisy chaining the Interrupt output pin, INT. This is done by connecting
multiple external temperature sensors (i.e. LM75 or LM73) to the BTI (Board Temperature Interrupt) input and/or
the GPI (Chassis Intrusion) input. The Chassis Intrusion input is designed to accept an active high signal from an
external circuit that latches, such as when the cover is removed from the computer.
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INTERFACE
Internal Registers of the LM96080
Table 1. The internal registers and their corresponding internal LM96080 address are as follows:
Register
LM96080 Internal
Address (Hex)
Power on Value
(Binary)
Notes
Configuration Register
00h
0000 1000
Interrupt Status Register 1
01h
0000 0000
Interrupt Status Register 2
02h
0000 0000
Interrupt Mask Register 1
03h
0000 0000
Interrupt Mask Register 2
04h
0000 0000
Fan Divisor/RST_OUT/OS Register
05h
0001 0100
OS/ Configuration/ Temperature Resolution
Register
06h
0000 0001
Conversion Rate Register
07h
0000 0000
Voltage/Temperature Channel Disable
Register
08h
0000 0000
Value RAM
20h - 29h
Indeterminate
Input and FAN readings
Value RAM
2Ah - 3Dh
Indeterminate
Limit Registers
Value RAM
3Eh
0000 0001
Manufacturer's ID
Value RAM
3Fh
0000 1000
Stepping/Die Revision ID
FAN1 and FAN2 divisor = 2 (count of 153
= 4400 RPM)
Allows voltage monitoring inputs to be
disabled
Serial Bus Interface/Serial Bus Timings
1
1
9
9
SCL
SDA
A6
A5
A4
A3
A2
A1
A0 R/W
D7
D6
Ack
by
Slave
Start by
Master
Frame 1
Serial Bus Address Byte
from Master
D5
D4
D3
D2
D1
D0
Frame 2
Internal Address Register
Byte from Master
Ack
by
Slave
Stop by
Master
Figure 8. Internal Address Register Set Only
1
9
1
9
SCL
SDA
A6
A5
A4
A3
A2
A1
A0 R/W
Frame 1
Serial Bus Address Byte
from Master
SCL
(continued)
SDA
(continued)
D7
Ack
by
Slave
Start by
Master
1
D7
D6
D5
D4
D3
D2
D1
Frame 2
Internal Address Register
Byte from Master
D0
Ack
by
Slave
9
D6
D5
D4
D3
Frame 3
Data Byte
D2
D1
D0
Ack
by
Slave
Stop by
Master
Figure 9. Internal Address Register Set with Data Byte Write
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1
9
1
9
SCL
SDA
A6
A5
A4
A3
A2
A1
A0 R/W
D7
D6
D5
D4
Ack
by
Slave
Start by
Master
Frame 1
Serial Bus Address Byte
from Master
D3
D2
D1
D0
No Ack
by
Master
Frame 2
Data Byte from
Slave
Stop
by
Master
Figure 10. Single Byte Read from Register with Preset Internal Address Register
1
1
9
9
1
9
SCL
SDA
A6
A5
A4
A3
A2
A1
A0 R/W
D15 D14 D13 D12 D11 D10 D9
Ack
by
Slave
Start by
Master
Frame 1
Serial Bus Address Byte
from Master
D8
D7
D6
D5
D4
Ack
by
Master
Frame 2
Data Byte from
Slave
D3
D2
D1
D0
No Ack Stop
by
by
Master Master
Frame 3
Data Byte from
Slave
Figure 11. Double Byte Read from Register with Preset Internal Address Register
1
9
1
9
SCL
SDA
A6
A5
A4
A3
A2
A1
A0
D7
R/W
Frame 1
Serial Bus Address Byte
from Master
1
SCL
(continued)
SDA
(continued)
A5
A4
A3
A2
A1
A0 R/W
Frame 3
Serial Bus Address Byte
from Master
D5
D4
D3
D2
D1
Frame 2
Internal Address Register
Byte from Master
D0
Ack
by
Slave
1
9
A6
Repeat
Start by
Master
D6
Ack
by
Slave
Start by
Master
9
D7
D6
D5
Ack
by
Slave
D4
D3
D2
D1
Frame 4
Data Byte from
Slave
D0
No Ack Stop
by
by
Master Master
Figure 12. Single Byte Read from Register with Internal Address Set using a Repeat Start
1
9
1
9
SCL
SDA
A6
A5
A4
A3
A2
A1
A0 R/W
Start by
Master
Frame 1
Serial Bus Address Byte
from Master
SCL
(continued)
SDA
(continued)
1
A6
Repeat
Start by
Master
D7
Ack
by
Slave
9
A5
A4
A3
A2
A1
A0 R/W
Frame 3
Serial Bus Address Byte
from Master
D6
D5
D4
D3
D2
D1
Ack
by
Slave
Frame 2
Internal Address Register
Byte from Master
1
9
D15 D14 D13 D12 D11 D10 D9
Ack
by
Slave
D0
Frame 4
Data Byte from
Slave
D8
1
D7
Ack
by
Master
9
D6
D5
D4
D3
D2
Frame 5
Data Byte from
Slave
D1
D0
No Ack Stop
by
by
Master Master
Figure 13. Double Byte Read from Register with Internal Address Set using a Repeat Start
The Serial Bus control lines include the SDA (serial data), SCL (serial clock), and A0-A2 (address) pins. The
LM96080 can only operate as a slave. The SCL line only controls the serial interface, all other clock functions
within LM96080 such as the ADC and fan counters are done with a separate asynchronous internal clock.
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When using the Serial Bus Interface, a write will always consists of the LM96080 Serial Bus Interface Address
byte, followed by the Internal Address Register byte, then the data byte.
There are two cases for a read:
1. If the Internal Address Register is known to be at the desired Address, simply read the LM96080 with the
Serial Bus Interface Address byte, followed by the data byte read from the LM96080.
2. If the Internal Address Register value is unknown, write to the LM96080 with the Serial Bus Interface
Address byte, followed by the Internal Address Register byte. Then restart the Serial Communication with a
Read consisting of the Serial Bus Interface Address byte, followed by the data byte read from the LM96080.
The default power on Serial Bus address for the LM96080 is 0101(A2)(A1)(A0) binary, where A0-A2 are the
Serial Bus Address.
All of the combinations of communications supported by the LM96080 are depicted in the Serial Bus Interface
Timing Diagrams as shown in Figure 13.
USING THE LM96080
Power On
When power is first applied, the LM96080 performs a “power on reset” on several of its registers. The power on
condition of registers is shown in Table 1. Registers whose power on values are not shown have power on
conditions that are indeterminate (this includes the value RAM and WATCHDOG limits). In most applications,
usually the first action after power-on would be to write WATCHDOG limits into the Value RAM.
Resets
Configuration Register INITIALIZATION bit (address 00h, bit 7) accomplishes the same function as power on
reset. The Value RAM conversion results (addresses 20h - 29h) and Value RAM WATCHDOG limits (addresses
2Ah - 3Dh) are not reset and will be indeterminate immediately after power on. If the Value RAM contains valid
conversion results and/or Value RAM WATCHDOG limits have been previously set, they will not be affected by
the Configuration Register INITIALIZATION (except for addresses 3Eh and 3Fh). Power on reset or
Configuration Register INITIALIZATION bit clear or initialize the following registers (the initialized values are
shown in Table 1):
1. Configuration Register
2. Interrupt Status Register 1
3. Interrupt Status Register 2
4. Interrupt Mask Register 1
5. Interrupt Mask Register 2
6. Fan Divisor/RST_OUT/OS Register
7. OS Configuration/Temperature Resolution Register
8. Conversion Rate Register
9. Voltage/Temperature Channel Disable Register
10. Value RAM Registers (only addresses 3Eh and 3Fh)
Configuration Register INITIALIZATION is accomplished by setting bit 7 of the Configuration Register (address
00h) high. This bit automatically clears after being set.
The LM96080 can be reset to its “power on state” by taking NTEST_IN/Reset_IN pin low for at least 50 ns.
The time it takes for NTEST_IN/Reset_IN rising edge to SDA falling edge is at least tRSDA, and for
NTEST_IN/Reset_IN rising edge to SCL falling edge is at least tRSCL. Refer to the AC Electrical Characteristics
for more information on tRSDA and tRSCL.
14
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Using the Configuration Register
The Configuration Register (address 00h) provides control for the LM96080. At power on, the ADC is stopped
and INT_Clear (bit 3) is asserted, clearing the INT and RST_OUT/OS hardwire outputs. The Configuration
Register starts and stops the LM96080, enables and disables INT outputs, clears and sets GPI (CI) and GPO I/O
pins, initiates reset pulse on RST_OUT/OS pin, and provides the reset function described in the AC Electrical
Characteristics section.
Bit 0 of the Configuration Register, START, controls the monitoring loop of the LM96080. Setting bit 0 low stops
the LM96080 monitoring loop and puts the LM96080 in shutdown mode, reducing power consumption. Serial Bus
communication is possible with any register in the LM96080 although activity on these lines will increase
consumption current. Taking bit 0 high starts the monitoring loop, described in more detail subsequently.
Bit 1 of the Configuration Register, INT Enable, enables the INT Interrupt hardwire output when this bit is taken
high.
Bit 2 of the Configuration Register, INT Polarity Select, defines whether the INT pin is NMOS or PMOS open
drain.
Bit 3, INT_Clear, clears the INT output when taken high. The LM96080 monitoring function will stop until bit 3 is
taken low. The content of the Interrupt Status Registers (addresses 01h - 02h) will not be affected.
Bit 4, RESET, when taken high, will initiate a 10 ms RESET signal on the RST_OUT/OS output when OS Pin
Enable (address 05h, bit 6) = 0 and RST Enable (address 05h, bit 7) = 1.
When bit 5, Chassis Clear, is taken high, the GPI (Chassis Intrusion) pin is driven low for 10 ms.
Bit 6 of the configuration register, GPO, sets or clears the GPO output. This pin can be used in software power
control by activating an external power control MOSFET.
Starting Conversions
Start the monitoring function (Analog inputs, temperature, and fan speeds) in the LM96080 by writing to the
Configuration Register and setting INT_Clear (bit 3) low and Start (bit 0) high. The LM96080 then performs a
round-robin monitoring of all analog inputs, temperature, and fan speed inputs. The sequence of items being
monitored corresponds to locations in the Value RAM (except for the Temperature reading) as follows:
1. Temperature
2. IN0
3. IN1
4. IN2
5. IN3
6. IN4
7. IN5
8. IN6
9. Fan 1
10. Fan 2
Reading Conversion Results
The conversion results are available in the Value RAM (addresses 20h - 29h). Conversions can be read at any
time and will provide the result of the last conversion. If a conversion is in progress while a communication is
started, that conversion will be completed, and the internal register(s) will not be updated until the communication
is complete.
A typical sequence of events upon power on of the LM96080 would consist of:
1. Set WATCHDOG Limits
2. Set Interrupt Masks
3. Start the LM96080 monitoring process
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ANALOG INPUTS
The 10-bit ADC has a 2.5 mV (2.56/210) LSb , yielding a 0V to 2.5575V (2.56 - 1 LSb) input range. This is true for
all analog inputs. In most monitoring applications, these inputs would most often be connected to power supplies.
The 2.5, 3.3, ±5 and ±12 volt inputs should be attenuated with external resistors to any desired value within the
input range. Care should be taken not to exceed V+ at any time.
A typical application, such as is shown in Figure 14, might select the input voltage divider to provide 1.9V at the
analog inputs of the LM96080. This is sufficiently high for good resolution of the voltage, yet leaves headroom for
upward excursions from the supply of about 25%. To simplify the process of resistor selection, set the value of
R2 first. Select a value for R2 or R4 between 10 kΩ and 100 kΩ. This is low enough to avoid errors due to input
leakage currents yet high enough to protect both the inputs under overdrive conditions as well as minimize
loading of the source. Then select R1 or R3 to provide a 1.9V input as show in Figure 14.
Figure 14. Input Examples. Resistor values shown in table provide approximately 1.9V at the analog
inputs.
Table 2. VIN = 1.9V for Different R Values
Voltage Measurements
(VS)
R1 or R3
R2 or R4
Voltage
at
Analog Inputs
( ADC code 760)
+2.5V
23.7 kΩ
75 kΩ
+1.9V
+3.3V
22.1 kΩ
30 kΩ
+1.9V
+5.0V
24 kΩ
14.7 kΩ
+1.9V
+12V
160 kΩ
30.1 kΩ
+1.9V
−12V
160 kΩ
35.7 kΩ
+1.9V
−5V
36 kΩ
16.2 kΩ
+1.9V
For positive input voltages, the equation for calculating R1 is as follows:
R1 = [ (VS − VIN) / VIN] R2
(1)
For negative input voltages, the equation for calculating R3 is as follows:
R3 = [ (VS − VIN) / (VIN − 5V)] R4
(2)
External resistors should be included to limit input currents to the values given in the ABSOLUTE MAXIMUM
RATINGS for Input Current At Any Pin. Inputs with the attenuator networks will usually meet these requirements.
If it is possible for inputs without attenuators to be turned on while LM96080 is powered off, additional resistors of
about 10 kΩ should be added in series with the inputs to limit the input current.
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SUPPLY CURRENT (I+)
The measured supply current (I+) in the Electrical Characteristics are only for the round robin conversion and the
shutdown mode at a certain supply voltage. To calculate the supply current I+ in the round robin mode at different
supply voltages, use the equation below.
+
I+ = (1293 x I
TEMP)
+ (1116 x 7 x I
+
VOLTAGE)
+
+ (253037 x I
SHUTDOWN)
262,142
(3)
The I+TEMP, I+VOLTAGE, and I+SHUTDOWN values can be obtained from the plots shown in Typical Performance
Characteristics.
LAYOUT AND GROUNDING
Analog inputs will provide best accuracy when referred to the AGND pin or a supply with low noise. A separate,
low-impedance ground plane for analog ground, which provides a ground point for the voltage dividers and
analog components, will provide best performance but is not mandatory. Analog components such as voltage
dividers should be located physically as close as possible to the LM96080.
The power supply bypass, a parallel combination of 10 μF (electrolytic or tantalum) and 0.1 μF (ceramic) bypass
capacitors connected between V+, pin 9, and ground, should also be located as close as possible to the
LM96080.
FAN INPUTS
Inputs are provided for signals from fans equipped with tachometer outputs. These are logic-level inputs set
according to the Fan Tach Pulse Inputs in the Electrical Characteristics table. Signal conditioning in the LM96080
accommodates the slow rise and fall times typical of fan tachometer outputs. The maximum input signal range is
0 to +5.5V. In the event these inputs are supplied from fan outputs which exceed 0 to +5.5V, either resistive
division or diode clamping must be included to keep inputs within an acceptable range. R2 is selected so that it
does not develop excessive error voltage due to input leakage. R1 is selected based on R2 to provide a
minimum input of 2V and a maximum of 5.5V. R1 should be as low as possible to provide the maximum possible
input up to 5.5V for best noise immunity. Alternatively, use a shunt reference or zener diode to clamp the input
level.
If fans can be powered while the power to the LM96080 is off, the LM96080 inputs must be protected to meet the
Absolute Maximum Ratings section. In most cases, open collector outputs with pull-up resistors inherently limit
this current. If this maximum current could be exceeded, either a larger pull up resistor should be used or
resistors connected in series with the fan inputs.
The Fan Inputs gate an internal 22.5 kHz oscillator for one period of the Fan signal into an 8-bit counter
(maximum count = 255). The default divisor is set to 2 (choices are 1, 2, 4, and 8) providing a nominal count of
153 for a 4400 RPM fan with two pulses per revolution. Typical practice is to consider 70% of normal RPM a fan
failure, at which point the count will be 219.
Determine the fan count according to:
(4)
For example, if the frequency of the tachometer were 150 Hz, the RPM would be 4,500 [RPM = (freq) × (60
seconds/min) / (2 pulses/revolution) ]. Since the default divisor is 2, the count would be 150 according to the
equation above.
Note that Fan 1 and Fan 2 Divisors are programmable via the Fan Divisor/RST_OUT/OS Register (address 05h).
FAN1 and FAN2 inputs can also be programmed to be level sensitive interrupt inputs.
Fans that provide only one pulse per revolution would require a divisor set twice as high as fans that provide two
pulses, thus maintaining a nominal fan count of 153. Therefore, the divisor should be set to 4 for a fan that
provides 1 pulse per revolution with a nominal RPM of 4400.
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Alternatives for Fan Inputs
Figure 15. Fan with Tach Pull-Up to +5V
Figure 16. Fan with Tach Pull-Up to +12V, or Totem-Pole Output and Resistor Attenuator
Figure 17. Fan with Tach Pull-Up to +12V and Diode Clamp
Figure 18. Fan with Strong Tach Pull-Up or Totem Pole Output and Diode Clamp
The table below shows example calculation for Count with different divisor and frequency. Counts are based on 2
pulses per revolution tachometer outputs.
RPM
Time per Revolution
Counts for “Divide by 2”
Comments
4400
13.64 ms
153 counts
Typical RPM
3080
19.48 ms
219 counts
70% RPM
2640
22.73 ms
255 counts
60% RPM
(Default) in Decimal
(maximum counts)
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Nominal RPM
Time per Revolution
Counts for the
70% RPM
Given Speed in Decimal
Time per Revolution
for 70% RPM
Divide by 1
8800
6.82 ms
153
6160
9.74 ms
Divide by 2
4400
13.64 ms
153
3080
19.48 ms
Divide by 4
2200
27.27 ms
153
1540
38.96 ms
Divide by 8
1100
54.54 ms
153
770
77.92 ms
TEMPERATURE MEASUREMENT SYSTEM
The LM96080 delta-VBE type temperature sensor and sigma-delta ADC perform 9-bit or a 12-bit two'scomplement conversions of the temperature. An 8-bit digital comparator is also incorporated that compares the
readings to the user-programmable Hot and Overtemperature setpoints, and Hysteresis values.
(Non-Linear Scale for Clarity)
Figure 19. 9-bit Temperature-to-Digital Transfer Function
(Non-Linear Scale for Clarity)
Figure 20. 12-bit Temperature-to-Digital Transfer Function
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Temperature Data Format
Temperature data can be read from the Temperature Reading Register (address 27h). Temperature limits can be
read from and written to the Hot Temperature, Hot Temperature Hysteresis, OS Temperature, and OS
Temperature Hysteresis Limit Registers (addresses 38h - 3Bh). These limits are also referred to as Thot, Thot hyst,
Tos , and Tos hyst respectively. Each limit is represented by an 8-bit, two's complement word with an LSb (Least
Significant Bit) equal to 1°C:
Temperature
Digital Output
Binary
Hex
+125°C
0111 1101
7Dh
+25°C
0001 1001
19h
+1.0°C
0000 0001
01h
+0°C
0000 0000
00h
−1.0°C
1111 1111
FFh
−25°C
1110 0111
E7h
−55°C
1100 1001
C9h
By default, Temperature Reading Register is represented by a 9-bit two's complement digital word with the LSb
having a resolution of 0.5°C:
Temperature
Digital Output
Binary
Hex
+125°C
0 1111 1010
0 FAh
+25°C
0 0011 0010
0 32h
+1.5°C
0 0000 0011
0 03h
+0°C
0 0000 0000
0 00h
−0.5°C
1 1111 1111
1 FFh
−25°C
1 1100 1110
1 CEh
−55°C
1 1001 0010
1 92h
Temperature Register data can also be represented by a 12-bit two's complement digital word with a LSb of
0.0625°C:
Temperature
20
Digital Output
Binary
Hex
+125°C
0111 1101 0000
7 D0h
+25°C
0001 1001 0000
1 90h
+1.0°C
0000 0001 0000
0 10h
+0.0625°C
0000 0000 0001
0 01h
0°C
0000 0000 0000
0 00h
(−0.0625)°C
1111 1111 1111
F FFh
(−1.0)°C
1111 1111 0000
F F0h
(−25)°C
1110 0111 0000
E 70h
(−55)°C
1100 1001 0000
C 90h
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When using a single byte read, the 8 MSbs of the Temperature reading can be found at Value RAM (address
27h). The remainder of the Temperature reading can be found in the OS Configuration/Temperature Resolution
Register (address 06h), bits 4-7. In 9-bit format, bit 7 is the only valid bit. In addition, all 9 or 12 bits can be read
using a double byte read at register address 27h.
Temperature Interrupts
There are four Value RAM WATCHDOG limits for the Temperature reading that affect the INT and OS outputs of
the LM96080. They are: Thot, Thot hyst, Tos , and Tos hyst Limit Registers (addresses 38h - 3Bh). There are three
interrupt modes of operation: “Default Interrupt” mode, “One-Time Interrupt” mode, and “Comparator Mode”. The
OS output of the LM96080 can be programmed for “One-Time Interrupt” mode and “Comparator” mode. INT can
be programmed for “Default Interrupt” mode and “One-Time” Interrupt. These modes are explained below and
shown in Figure 21.
“Default Interrupt mode” operates in the following way: Exceeding Thot causes an Interrupt that will remain
active indefinitely until reset by reading Interrupt Status Register 1 (address 01h) or cleared by the INT_Clear bit
in the Configuration register (address 00h, bit 3). Once an Interrupt event has occurred by crossing Thot, then
reset, an Interrupt will occur again once the next temperature conversion has completed. The interrupts will
continue to occur in this manner until the temperature goes below Thot hyst, at which time the Interrupt output will
automatically clear.
“One-Time Interrupt” mode operates in the following way: Exceeding Thot causes an Interrupt that will remain
active indefinitely until reset by reading Interrupt Status Register 1 or cleared by the INT_Clear bit in the
Configuration register. Once an Interrupt event has occurred by crossing Thot, then reset, an Interrupt will not
occur again until the temperature goes below Thot hyst.
“Comparator” mode operates in the following way: Exceeding Tos causes the OS output to go Low (default).
OS will remain Low until the temperature goes below Tos hyst. Once the temperature goes below Tos hyst, OS will
go high.
A.
This diagram does not reflect all the possible variations in the operation of the OS and INT outputs nor the OS and
Hot Temp bits. The interrupt outputs are cleared by reading the appropriate Interrupt Status Registers (addresses 01h
- 02h).
Figure 21. Temperature Interrupt Response Diagram
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THE LM96080 INTERRUPT STRUCTURE
IN0 Watchdog
OS Status 06h[0]
Temp Watchdog
IN1 Watchdog
IN2 Watchdog
OS Polarity 06h[1]
IN3 Watchdog
RST_OUT / OS
IN4 Watchdog
IN5 Watchdog
IN6 Watchdog
Temp Watchdog
OS Pin Enable 05h[6]
Interrupt
Status
Registers
INT Mask
Registers
RST Enable 05h[7]
RESET 00h[4]
Fan 1 Watchdog
Fan 2 Watchdog
BTI
GPI (CI)
INT_IN
INT
Enable
00h[1]
INT
INT_Clear
00h[3]
INT
Polarity
Select 00h[2]
Figure 22. Interrupt Structure
Figure 22 depicts the Interrupt Structure of the LM96080. Note that the number next to each input of the gate
represents a register and bit address. For example, INT_Clear 00h[3] refers to bit 3, INT_Clear, of register
address 00h. The LM96080 can generate Interrupts as a result of each of its internal WATCHDOG registers on
the analog, temperature, and fan inputs.
Interrupt Inputs
External Interrupts can come from the following sources. While the label suggests a specific type or source of
Interrupt, this label is not a restriction of its usage, and it could come from any desired source:
• BTI (Board Temperature Interrupt) - This is an active low Interrupt intended to come from the
Overtemperature Shutdown (O.S.) output of LM75 temperature sensors. The LM75 O.S. output goes active
when its temperature exceeds a programmed threshold. Up to 8 LM75's can be connected to a single serial
bus with their O.S. output's wire or'ed to the BTI input of the LM96080. If the temperature of any LM75
exceeds its programmed limit, BTI is driven low. This generates an Interrupt via bit 1 of the Interrupt Status
Register 2 (address 02h) to notify the host of a possible overtemperature condition. To disable this feature,
set bit 1 of the Interrupt Mask Register 2 (address 04h) high. This pin also provides an internal pull-up resistor
of 10 kΩ.
• GPI (Chassis Intrusion) - This is an active high interrupt from any type of device that detects and captures
chassis intrusion violations. This could be accomplished mechanically, optically, or electrically, and circuitry
external to the LM96080 is expected to latch the event. Read this Interrupt using bit 4 of the Interrupt Status
Register 2 (address 02h), and disable it using bit 4 of the Interrupt Mask Register 2 (address 04h). The
design of the LM96080 allows this input to go high even with no power applied to the LM96080, and no
clamping or other interference with the line will occur. This line can also be pulled low for at least 10 ms by
the LM96080 to reset a typical Chassis Intrusion circuit. Accomplish this reset by setting bit 5 of Configuration
Register (address 00h) high; this bit is self-clearing.
• INT_IN - This active low Interrupt provides a way to chain the INT (Interrupt) from other devices through the
LM96080 to the processor. If this pin is pulled low, then bit 7 of the Interrupt Status Register 1 (address 01h)
will go high indicating this Interrupt detection. Setting bit 1 of the Configuration Register (address 00h) will
also allow the output INT pin to go low when INT_IN goes low. To disable this feature, set bit 7 of the
Interrupt Mask Register 1 (address 03h) high.
Interrupt Outputs
All Interrupts are indicated in the two Interrupt Status Registers.
• INT -an output pin, not to be confused with the input INT_IN pin. This pin becomes active whenever INT_IN,
BTI, or GPI interrupts. As described in Using the Configuration Register, INT is enabled when bit 1 of the
Configuration Register (address 00h) is set high. Bits 2 and 3 of the Configuration Register are also used to
set the polarity and state of the INT Interrupt line.
• OS -dedicated to the Temperature reading WATCHDOG. In the Fan Divisor/RST_OUT/OS Register (address
22
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05h), the OS enable bit (bit 6), must be set high and the RST enable bit (bit 7) must be set low to enable the
OS function on the RST_OUT/OS pin. OS pin has two modes of operation: “One-Time Interrupt” and
“Comparator”. “One-Time Interrupt” mode is selected by taking bit 2 of the OS Configuration/Temperature
Resolution Register (address 06h) high. If bit 2 is taken low, “Comparator” mode is selected. Unlike the OS
pin, the OS bit in Interrupt Status Register 2 (address 02h, bit 5) functions in “Default Interrupt” and “OneTime Interrupt” modes. The OS bit can be masked to INT pin by taking bit 5 in the Interrupt Mask Register 2
(address 04h) low. A description of “Comparator”, “Default Interrupt”, and “One-Time Interrupt” modes can be
found in Temperature Data Format.
Interrupt Clearing
Reading an Interrupt Status Registers (addresses 01h - 02h) will output the contents of the Register and reset
the Register. The Interrupt Status Registers clear upon being read. When the Interrupt Status Registers clear,
the INT output pin is also cleared until the Registers are updated by the monitoring loop. The INT output pin is
cleared with the INT_Clear bit (address 00h, bit 3), without affecting the contents of the Interrupt Status
Registers. When this bit is high, the LM96080 monitoring loop will stop and will resume when the bit is low.
RST_OUT and GPO OUTPUTS
In PC applications, the open drain GPO provides a gate drive signal to an external PMOS power switch. This
external MOSFET would keep the power turned on regardless of the state of the front panel power switches
when software power control is used. In any given application, this signal is not limited to the function described
by its label. For example, since the LM96080 incorporates temperature sensing, the GPO output could also be
utilized to control power to a cooling fan. Take GPO active low by setting bit 6 in the Configuration Register
(address 00h) high.
RST_OUT is intended to provide a master reset to devices connected to this line. RST Enable, bit 7 of address
05h, is the RST_OUT/OS control bit that must be set high to enable this function. Setting bit 4, RESET, in the
Configuration Register (address 00h) high outputs a low pulse of at least 10 ms on this line, at the end of which
bit 4 in the Configuration Register automatically clears. Again, the label for this pin is only its suggested use. In
applications where the RST_OUT capability is not needed, it can be used for any type of digital control that
requires a 10 ms active low open drain output.
NAND TREE TESTS
A NAND tree is provided in the LM96080 for Automated Test Equipment (ATE) board level connectivity testing. If
the user applies a logic zero to the NTEST_IN/Reset_IN input pin, the device will be in the NAND tree test mode.
A0/NTEST_OUT will become the NAND tree output pin. To perform a NAND tree test, all pins included in the
NAND tree should be driven to 1. Beginning with IN0 and working clockwise around the chip, each pin can be
toggled and a resulting toggle can be observed on A0/NTEST_OUT. The following pins are excluded from the
NAND tree test: GNDA (analog ground), GND (digital ground), V+ (power supply), A0/NTEST_OUT,
NTEST_IN/Reset_IN and RST_OUT/OS. Allow for a typical propagation delay of 500 ns.
REGISTERS AND RAM
Address Register
The bit designations for a register are as follows:
Bit
Name
7-0 Address Pointer
Bit 7
Read/Write
Read/Write
Bit 6
Description
Address of RAM and Registers. See the tables below for detail.
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
A2
A1
A0
Address Pointer (Power On default 00h)
A7
A6
A5
A4
A3
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Address Pointer Index (A7–A0)
A7–A0 in Hex
Power On Value of Registers:
in Binary
Configuration Register
00h
0000 1000
Interrupt Status Register 1
01h
0000 0000
Interrupt Status Register 2
02h
0000 0000
Interrupt Mask Register 1
03h
0000 0000
Interrupt Mask Register 2
04h
0000 0000
Fan Divisor/RST_OUT/OS
05h
0001 0100
OS Configuration/Temperature Resolution
Register
06h
0000 0001
Conversion Rate Register
07h
0000 0000
Registers and RAM
Channel Disable Register
Value RAM
08h
0000 0000
20h – 3Fh
Register 3Eh defaults to 0000 0001
Register 3Fh defaults to 0000 1000
Configuration Register—Address 00h
Power on default = 00001000 binary
Bit
Name
Read/Write
Description
0
Start
Read/Write
A one enables startup of monitoring operations, a zero puts the part in shutdown mode.
Note: Unlike the "INT_Clear" bit, the outputs of Interrupt pins will not be cleared if the user writes a
zero to this location after an interrupt has occurred. At startup, limit checking functions and scanning
begin. Note, all limits should be set in the Value RAM before setting this bit HIGH.
1
INT Enable
Read/Write
A one enables the INT Interrupt output.
2
INT Polarity
Select
Read/Write
A one selects an active high open source output while a zero selects an active low open drain
output.
3
INT_Clear
Read/Write
A one disables the INT output without affecting the contents of Interrupt Status Registers. The
device will stop monitoring. It will resume upon clearing of this bit.
4
RESET
Read/Write
A one outputs at least a 10 ms active low reset signal at RST_OUT, if bit 7 and bit 6 in the Fan
Divisor/RST_OUT/OS Register (address 05h) = 1 and = 0, respectively. This bit is cleared once the
pulse has gone inactive.
5
Chassis Clear
Read/Write
A one clears the GPI (Chassis Intrusion) pin. This bit clears itself after 10 ms.
6
GPO
Read/Write
A one drives the GPO (General Purpose Output) pin low.
7
INITIALIZATION
Read/Write
A one restores power on default value to the Configuration Register, Interrupt Status Registers,
Interrupt Mask Registers, Fan Divisor/RST_OUT/OS Register, the OS Configuration/Temperature
Resolution Register, Conversion Rate, Channel Disable, Manufacturers ID and Stepping/Die
revision ID registers. This bit clears itself. The power-on default is zero.
Interrupt Status Register 1—Address 01h
Power on default = 0000 0000 binary
Bit
Name
Read/Write
Description
0
IN0
Read Only
A one indicates a High or Low limit has been exceeded.
1
IN1
Read Only
A one indicates a High or Low limit has been exceeded.
2
IN2
Read Only
A one indicates a High or Low limit has been exceeded.
3
IN3
Read Only
A one indicates a High or Low limit has been exceeded.
4
IN4
Read Only
A one indicates a High or Low limit has been exceeded.
5
IN5
Read Only
A one indicates a High or Low limit has been exceeded.
6
IN6
Read Only
A one indicates a High or Low limit has been exceeded.
7
INT_IN
Read Only
A one indicates that a Low has been detected on the INT_IN.
24
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Interrupt Status Register 2—Address 02h
Power on default = 0000 0000 binary
Bit
Name
Read/Write
Description
0
Hot Temperature
Read Only
A one indicates a High or Low limit has been exceeded. Only “One-Time Interrupt” and
“Default Interrupt” modes are supported (see Temperature Interrupts and Interrupt Outputs).
The mode is set by bit-6 of the Interrupt Mask Register 2 (address 04h).
1
BTI
Read Only
A one indicates that an interrupt has occurred from the Board Temperature Interrupt (BTI)
input pin. BTI can be tied to the OS output of multiple LM75 chips.
2
FAN1
Read Only
A one indicates that a fan count limit has been exceeded.
3
FAN2
Read Only
A one indicates that a fan count limit has been exceeded.
4
GPI (Chassis
Intrusion)
Read Only
A one indicates GPI (Chassis Intrusion) has gone high.
5
OS bit
Read Only
A one indicates a High or a Low OS Temperature limit has been exceed. Only “One-Time
Interrupt” and “Default Interrupt” modes are supported (see Temperature Interrupts and
Interrupt Outputs). The mode is set by bit 7 of the Interrupt Mask Register 2.
6
Reserved
Read Only
7
Reserved
Read Only
Interrupt Mask Register 1—Address 03h
Power on default = 0000 0000 binary
Bit
Name
Read/Write
Description
0
IN0
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
1
IN1
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
2
IN2
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
3
IN3
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
4
IN4
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
5
IN5
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
6
IN6
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
7
INT_IN
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
Interrupt Mask Register 2—Address 04h
Power on default = 0000 0000 binary
Bit
Name
Read/Write
Description
0
Hot Temperature
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
1
BTI
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
2
FAN1
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
3
FAN2
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
4
GPI (Chassis
Intrusion)
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
5
OS bit
Read/Write
A one disables the corresponding interrupt status bit for INT interrupt.
6
Hot Temperature
Interrupt Mode
Select
Read/Write
A zero selects the default interrupt mode which gives the user an interrupt if the temperature
goes above the hot limit. The interrupt will be cleared once the status register is read, but it will
again be generated when the next conversion has completed. It will continue to do so until the
temperature goes below the hysteresis limit.
A one selects the one time interrupt mode which only gives the user one interrupt when it goes
above the hot limit. The interrupt will be cleared once the status register is read. Another interrupt
will not be generated until the temperature goes below the hysteresis limit. It will also be cleared
if the status register is read. No more interrupts will be generated until the temperature goes
above the hot limit again. The corresponding bit will be cleared in the status register every time it
is read but may not set again when the next conversion is done. (Refer to Figure 21).
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Bit
7
Name
OS Bit Interrupt
Mode Select
www.ti.com
Read/Write
Description
Read/Write
A zero selects the default interrupt mode which gives the user an interrupt if the temperature
goes above the OS limit. The interrupt will be cleared once the status register is read, but it will
again be generated when the next conversion has completed. It will continue to do so until the
temperature goes below the hysteresis limit.
A one selects the one time interrupt mode which only gives the user one interrupt when it goes
above the OS limit. The interrupt will be cleared once the status register is read. Another interrupt
will not be generated until the temperature goes below the hysteresis limit. It will also be cleared
if the status register is read. No more interrupts will be generated until the temperature goes
above the OS limit again. The corresponding bit will be cleared in the status register every time it
is read but may not set again when the next conversion is done. (Refer to Figure 21).
Fan Divisor/RST_OUT/OS Register —Address 05h
Power on – is 0001 0100
Bit
Name
0
FAN1 Mode Select
Read/Write
Read/Write
A one selects the level sensitive input mode while a zero selects Fan count mode for the FAN1
input pin.
1
FAN2 Mode Select
Read/Write
A one selects the level sensitive input mode while a zero selects Fan count mode for the FAN2
input pin.
2-3 FAN1 RPM Control Read/Write
Description
FAN1 Speed Control.
= 00 - divide by 1;
= 01 - divide by 2;
= 10 - divide by 4;
= 11 - divide by 8.
If level sensitive input is selected: = 1 selects and active-low input (An interrupt will be
generated if the FAN1 input is Low), = 0 selects an active-high input (an interrupt will be
generated if the FAN1 input is High).
4-5 FAN2 RPM Control Read/Write
FAN2 Speed Control.
= 00 - divide by 1;
= 01 - divide by 2;
= 10 - divide by 4;
= 11 - divide by 8.
If level sensitive input is selected: = 1 selects and active-low input (An interrupt will be
generated if the FAN2 input is Low), = 0 selects an active-high input (an interrupt will be
generated if the FAN2 input is High).
6
OS Pin Enable
Read/Write
A one enables OS mode on the RST_OUT/OS output pin, while bit 7 of this register is set to
zero. If bits 6 and 7 of this register are set to zero, the RST_OUT/OS pin is disabled.
7
RST Enable
Read/Write
A one sets the RST_OUT/OS pin in the RST_OUT mode instead of the OS mode. If bits 6 and
7 of this register are set to zero, the RST_OUT/OS pin is disabled.
OS Configuration/Temperature Resolution Register—Address 06h
Power on default = 0000 0001 binary
Bit
Name
Read/Write
Description
0
OS Status
Read only
Status of the OS. This bit mirrors the state of the RST_OUT/OS pin when in the OS mode.
1
OS Polarity
Read/Write
A zero selects OS to be active-low, while a one selects OS to be active high. OS is an opendrain output.
2
OS Mode Select
Read/Write
A one selects the one time interrupt mode for OS, while a zero selects comparator mode for
OS. (See Temperature Data Format)
3
Temperature
Resolution Control
Read/Write
A zero selects the default 8-bit plus sign resolution temperature conversions, while a one
selects 11-bit plus sign resolution temperature conversions.
26
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Bit
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Name
4-7 Temp [3:0]
Read/Write
Read/Write
Description
The lower nibble (4 LSbs) of the 11-bit plus sign temperature data:
= Temp [0] (nibble LSb, 0.0625°C),
= Temp [1],
= Temp [2],
= Temp [3] (nibble MSb, 0.5°C).
For 8-bit plus sign temperature resolution:
= Temp [0] (LSb, 0.5°C)
are undefined
Conversion Rate Register—Address 07h
Power on default = 0000 0000 binary
Bit
0
Name
Read/Write
Description
CR1
Read/Write
Controls conversion rate:
0 = 728ms (typical)
1 = Continuous Conversion.
Note:
— Each voltage channel conversion takes 3 ms typical.
— Temperature conversion takes 3.6 ms typical for 9 - bit resolution and 23.5 ms typical for 12
- bit resolution.
— Each fan tachometer input is monitored for 2 pulses, the time interval for two pulses is added
to the round robin time for each fan tach input that is enabled.
1-7 Reserved
Read only
Reserved — will always report zero.
Voltage/Temperature Channel Disable Register—Address 08h
Power on default = 0000 0000 binary
Bit
Name
Read/Write
Description
0
IN0
Read/Write
When set to "1", IN0:
conversions are skipped and disabled
value register reading will be 0
error events will be suppressed
1
IN1
Read/Write
When set to "1", IN1:
conversions are skipped and disabled
value register reading will be 0
error events will be suppressed
2
IN2
Read/Write
When set to "1", IN2:
conversions are skipped and disabled
value register reading will be 0
error events will be suppressed
3
IN3
Read/Write
When set to "1", IN3:
conversions are skipped and disabled
value register reading will be 0
error events will be suppressed
4
IN4
Read/Write
When set to "1", IN4:
conversions are skipped and disabled
value register reading will be 0
error events will be suppressed
5
IN5
Read/Write
When set to "1", IN5:
conversions are skipped and disabled
value register reading will be 0
error events will be suppressed
6
IN6
Read/Write
When set to "1", IN6:
conversions are skipped and disabled
value register reading will be 0
error events will be suppressed
7
Temp
Read/Write
When set to "1", Temperature:
conversions are skipped and disabled
value register readings will be 0
error events will be suppressed
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Value RAM—Address 20h–3Fh (1)
Address A7–A0
(1)
28
Description
20h
IN0 reading (10-bit)
21h
IN1 reading (10-bit)
22h
IN2 reading (10-bit)
23h
IN3 reading (10-bit)
24h
IN4 reading (10-bit)
25h
IN5 reading (10-bit)
26h
IN6 reading (10-bit)
27h
Temperature reading (9-bit or 12-bit for easy read-back)
28h
FAN1 reading
Note: This location stores the number of counts of the internal clock per revolution.
29h
FAN2 reading
Note: This location stores the number of counts of the internal clock per revolution.
2Ah
IN0 High Limit
2Bh
IN0 Low Limit
2Ch
IN1 High Limit
2Dh
IN1 Low Limit
2Eh
IN2 High Limit
2Fh
IN2 Low Limit
30h
IN3 High Limit
31h
IN3 Low Limit
32h
IN4 High Limit
33h
IN4 Low Limit
34h
IN5 High Limit
35h
IN5 Low Limit
36h
IN6 High Limit
37h
IN6 Low Limit
38h
Hot Temperature Limit (High)
39h
Hot Temperature Hysteresis Limit (Low)
3Ah
OS Temperature Limit (High)
3Bh
OS Temperature Hysteresis Limit (Low)
3Ch
FAN1 Fan Count Limit
Note: It is the number of counts of the internal clock for the Low Limit of the fan speed.
3Dh
FAN2 Fan Count Limit
Note: It is the number of counts of the internal clock for the Low Limit of the fan speed.
3Eh
Manufacturer's ID always defaults to 0000 0001; this register is writable and can be reset to the default value by the
INITIALIZATION bit in the Configuration Register (address 00h, bit 7).
3Fh
Stepping/Die Revision ID always defaults to 0000 1000; this register is writable and can be reset to the default
value by the INITIALIZATION bit in the Configuration Register.
Setting all ones to the high limits for voltages and fans (0111 1111 binary for temperature) means interrupts will never be generated
except the case when voltages go below the low limits.
For voltage input high limits, the device is doing a greater than comparison. For low limits, however, it is doing a less than or equal to
comparison.
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REVISION HISTORY
Changes from Revision C (March 2013) to Revision D
•
Page
Changed layout of National Data Sheet to TI format .......................................................................................................... 28
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29
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)
LM96080CIMT/NOPB
ACTIVE
TSSOP
PW
24
61
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 125
LM96080
CIMT
LM96080CIMTX/NOPB
ACTIVE
TSSOP
PW
24
2500
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 125
LM96080
CIMT
(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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