NCT7509Y
NCT7509W
Nuvoton Thermal Sensor IC
with Fan Control
Date: Aug/15/2012
Revision: 1.0
NCT7509W/NCT7509Y
Table of Content1.
GENERAL DESCRIPTION ......................................................................................................... 1
2.
FEATURES ................................................................................................................................. 1
2.1
Fan Speed Monitoring and Control ............................................................................................1
2.2
Temperature Measurement ........................................................................................................1
2.3
Event Notification.........................................................................................................................1
2.4
General ........................................................................................................................................1
3.
KEY SPECIFICATIONS .............................................................................................................. 2
4.
PIN CONFIGURATION ............................................................................................................... 2
5.
PIN DESCRIPTION ..................................................................................................................... 3
6.
5.1
PIN TYPE DISCRIPTION ...........................................................................................................3
5.2
PIN DISCRIPTION ......................................................................................................................3
FUNCTION DESCRIPTION ........................................................................................................ 4
6.1
General Description ....................................................................................................................4
6.2
Access Interface ..........................................................................................................................4
Data write to the internal register .............................................................................. 4
6.2.2
Data read from the internal register .......................................................................... 4
6.3
Address Setting ...........................................................................................................................5
6.4
Temperature Measurement Data Format..................................................................................5
6.5
7.
6.2.1
6.4.1
The local temperature (on-die) data with 8-bit 2`s complement format. .................... 5
6.4.2
The remote temperature data with 11-bit 2`s complement format. ........................... 5
ALERT# Output ...........................................................................................................................5
6.5.1
ALERT# Output Comparator Mode .......................................................................... 6
6.5.2
ALERT# Output Interrupt Mode ................................................................................ 6
6.5.3
ALERT# Output SMBus
TM
alert Mode ...................................................................... 7
6.6
T_CRIT# Output ..........................................................................................................................7
6.7
FAN_IN Count Calculation .........................................................................................................8
6.8
FAN_OUT Duty Cycle Calculation .............................................................................................8
6.9
SMART FAN
TM
IV Control Parameters ......................................................................................8
6.9.1
Step Up Time / Step Down Time .............................................................................. 8
6.9.2
Fan Output Start-up Value ........................................................................................ 8
6.9.3
Fan Output Nonstop Value ....................................................................................... 8
6.9.4
Fan Output Stop Time .............................................................................................. 9
6.10
Speed Cruise Mode ....................................................................................................................9
6.11
Thermal Cruise Mode .............................................................................................................. 10
6.12
SMART FAN
6.13
Dynamic Fast Tracking Feature .............................................................................................. 12
TM
IV & Close Loop Fan Control Mode ............................................................. 11
REGISTER SUMMARY ............................................................................................................ 13
7.1
Register Map ............................................................................................................................ 13
7.2
Register Detail .......................................................................................................................... 16
-I-
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
7.2.1
Local Diode Temperature Readout Register .......................................................... 16
7.2.2
Remote Diode 1 Temperature Readout (MSB) Register ........................................ 16
7.2.3
Alert Status Register ............................................................................................... 16
7.2.4
Configuration Register ............................................................................................ 17
7.2.5
Conversion Rate Register....................................................................................... 18
7.2.6
Local Diode Temperature Alert Temperature Register ........................................... 18
7.2.7
Remote Diode 1 Temperature High Alert Temperature (MSB) Register ................. 18
7.2.8
Remote Diode 1 Temperature Low Alert Temperature (MSB) Register ................. 19
7.2.9
One Shot Conversion Register ............................................................................... 19
7.2.10
Remote Diode 1 Temperature Readout (LSB) Register ......................................... 19
7.2.11
Remote Diode 1 Temperature Offset Register (MSB) Register .............................. 19
7.2.12
Remote Diode 1 Temperature Offset Register (LSB) Register ............................... 20
7.2.13
Remote Diode 1 Temperature High Alert Temperature (LSB) Register .................. 20
7.2.14
Remote Diode 1 Temperature Low Alert Temperature (LSB) Register .................. 20
7.2.15
Alert Mask Register ................................................................................................ 20
7.2.16
Remote Diode 1 Critical Temperature Register ...................................................... 21
7.2.17
Critical Temperature Hysteresis Register ............................................................... 22
7.2.18
Customer Data Log Registers ................................................................................ 22
7.2.19
Fan Count Readout (MSB) Register ....................................................................... 22
7.2.20
Fan Count Readout (LSB) Register ........................................................................ 22
7.2.21
Fan Count High Limit (MSB) Register .................................................................... 23
7.2.22
Fan Count High Limit (LSB) Register ..................................................................... 23
7.2.23
Fanctrl Duty Cycle Register .................................................................................... 23
7.2.24
Generic Fan Control Configuration Register 1 (GFCCR1) Register ....................... 24
7.2.25
Generic Fan Control Configuration Register 2 (GFCCR2) Register ....................... 24
7.2.26
Generic Fan Control Configuration Register 3 (GFCCR3) Register ....................... 25
7.2.27
Generic Fan Control Configuration Register 4 (GFCCR4) Register ....................... 26
7.2.28
Dynamic Close Loop Fan Control Configuration Registers..................................... 26
7.2.29
SMART FAN
TM
IV Control Output Step Up Time Register ...................................... 30
7.2.30
SMART FAN
TM
IV Control Output Step Down Time Register ................................. 31
7.2.31
Fan Output PWM Frequency Prescalar Register .................................................... 31
7.2.32
Fan Output Start-up Value Register ....................................................................... 32
7.2.33
Fan Output Nonstop Value Register ....................................................................... 32
7.2.34
Fan Output Stop Time Register .............................................................................. 32
7.2.35
FANIN Target Speed Register ................................................................................ 33
7.2.36
Tolerance of FANIN Target Speed Register ........................................................... 33
7.2.37
Target Temperature of Temperature Input 1 Register ............................................ 34
7.2.38
Target Temperature of Temperature Input 2 Register ............................................ 34
7.2.39
Hysteresis of Temperature Input 1 Register ........................................................... 34
7.2.40
Hysteresis of Temperature Input 2 Register ........................................................... 35
7.2.41
SMART FAN
7.2.42
Remote Diode Temperature Filter and Alert Mode Setting Register ....................... 37
7.2.43
Chip ID Register ..................................................................................................... 37
7.2.44
Vendor ID Register ................................................................................................. 38
TM
IV Temperature and PWM Registers Register .............................. 36
- II -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
7.2.45
8.
Device ID Register .................................................................................................. 38
ELECTRICAL CHARACTERISTICS ......................................................................................... 39
8.1
Absolute Maximum Ratings ..................................................................................................... 39
8.2
DC Characteristics ................................................................................................................... 39
8.3
AC Characteristics.................................................................................................................... 40
9.
ORDERING INFORMATION ..................................................................................................... 40
10.
TOP MARKING SPECIFICATION ............................................................................................ 41
11.
PACKAGE DRAWING AND DIMENSIONS .............................................................................. 42
12.
11.1
10L DFN (3X3 MM^2; 0.8 MM) ............................................................................................... 42
11.2
10L MSOP (3X3 MM^2)........................................................................................................... 43
REVISION HISTORY ................................................................................................................ 44
- III -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
1. GENERAL DESCRIPTION
The NCT7509 is a Nuvoton Hardware Monitor IC, contains 1 remote and 1 on-die temperature sensor
TM
and 1 fan controller with SMBus interface. The remote sensor is diode-connected transistor, such
as 2N3904 or the thermal diode integrated in Computer Processor Units (CPU) and Graphics
Processor Units (GPU). The NCT7509 also supports offset adjust register to correct the errors that
casued by different thermal diodes.
The fan controller in NCT7509 support PWM (pulse width modulation) fan output modes for Nuvoton
TM
TM
TM
SMART FAN control - “Thermal Cruise “ mode and “SMART FAN IV” mode. In the “Thermal
TM
Cruise “ mode, temperatures of CPU/GPU and the system can be maintained within specific
TM
programmable ranges under the hardware control. S MART FAN IV provides 8 sets of temperatures
setting points to program 6 slopes linear fan speed vs. temperature transfer function. NCT7509 also
supports close-loop fan controller based on RPM. The NCT7509 provides an easy to implement
cooling and quiet solution with maximum safety and flexibility.
The NCT7509 supports 2 wire alert signals which ALERT# is for processor event notification and
T_CRIT is for thermal shutdown.
2.
2.1
FEATURES
Fan Speed Monitoring and Control
Support 256 steps PWM modes fan speed control
Thermal Cruise “ and SMART FAN™IV to control the fan speed
TM
Enhanced Smart Fan algorithm, SMART FAN ™ IV, supports multi-tracking of fan control vs.
temperature and registers for each fan control output.
Closed-loop fan controller via RPM setting
Manual Mode for specific application
2.2
Temperature Measurement
Measure the temperature with high accuracy
One local on-die thermal sensor
One remote temperature sensor with current mode
2.3
Event Notification
Supports 2 alert outputs : ALERT# and T_CRIT#
Event notification via ALERT# signal for over temperature and fan error
ALERT# output supports SMBus
T_CRIT# point supports Hardware Power-on setting
2.4
TM
2.0 ARA function
General
2
TM
I C® Compatible System Management bus (SMBus )
3.3V±5% VDD operation
10-pin MSOP and DFN Green Package (Halogen-free)
-1-
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
3. KEY SPECIFICATIONS
PARAMETER
RATING
-40C to +125C
Local temperature range and accuracy
Typ. 2C (20C~40C)
Max. 3C (-40C~125C)*1
-40C to +127C
Remote temperature range and accuracy
Typ. 1C (25C ~70C)
Typ. 2C (-40C ~127C)
Max. 3C (-40C~127C)*2
Supply voltage
3.3V ± 5%
Operating supply current
3 mA typ.
ADC resolution include sign bit
10 Bits
*1 Guaranteed by design from -40~125 degreeC, 100% tested at 85 degreeC.
*2 Guaranteed by design from -40~127 degreeC, 100% tested at 85 degreeC.
4. PIN CONFIGURATION
-2-
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
5. PIN DESCRIPTION
5.1
PIN TYPE DISCRIPTION
PIN TYPE
OD12
Open-drain output pin with 12 mA sink capability
INts
TTL level input pin and schmitt trigger
AIN
Input pin (Analog)
P
5.2
PIN ATTRIBUTE
Power or Ground Pin
PIN DISCRIPTION
PIN NO.
PIN NAME
I/O
FUNCTION
1
T_CRIT#
OD12
T_CRIT alarm output, for interrupt or shutdown
control
2
VDD
P
3
D+
AIN
Connect to Thermal Diode Anode
4
D-
AIN
Connect to Thermal Diode Cathode
5
FAN_OUT
OD12
Fan speed control PWM output
6
GND
P
7
ALERT#
OD12
8
FAN_IN
INts
9
SDA
INts/ OD12
SMBus
TM
bi-directional data
10
SCL
INts
SMBus
TM
Clock
DC Power supply, Voltage input 3.3V±5%
Power supply ground
Alarm output, for interrupt control
Fan tachometer input
-3-
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
6. FUNCTION DESCRIPTION
6.1
General Description
TM
NCT7509 is SMBus interface device to provides on-die temperature sensor and 1 set of thermal
inputs for CPU/GPU thermal diode sensor, 2 wire alert signals which ALERT# is for processor event
notification and T_CRIT# is for thermal shutdown,1set fan speed input and output which support
PWM(Pulse Width Modulation) fan control.
6.2
Access Interface
NCT7509 provides SMBus
read protocols.
TM
to access the internal register. It supports SMBus
6.2.1
Data write to the internal register
6.2.2
Data read from the internal register
-4-
TM
byte write and byte
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
6.3
Address Setting
NCT7509 I2C/SMBus
6.4
address is 1001100xb (x is R/W bit).
Temperature Measurement Data Format
6.4.1
6.4.2
6.5
TM
The local temperature (on-die) data with 8-bit 2`s complement format.
TEMPERATURE
8-BIT DIGITAL OUTPUT
+127°C
0111,1111
+25°C
0001,1001
+2°C
0000,0010
+1°C
0000,0001
+0°C
0000,0000
- 1°C
1111,1111
- 2°C
1111,1110
- 25°C
1110,0111
- 128°C
1000,0000
The remote temperature data with 11-bit 2`s complement format.
TEMPERATURE
8-BIT DIGITAL OUTPUT HIGH BYTE
3-BIT DIGITAL OUTPUT LOW BYTE
+127.875°C
0111,1111
111X,XXXX
+25.750°C
0001,1001
110X,XXXX
+2.250°C
0000,0010
010X,XXXX
+1.125°C
0000,0001
001X,XXXX
+0.000°C
0000,0000
000X,XXXX
- 1.125°C
1111,1110
111X,XXXX
- 2.250°C
1111,1101
110X,XXXX
- 25.750°C
1110,0110
010X,XXXX
- 127.875°C
1000,0000
001X,XXXX
ALERT# Output
The NCT7509 ALERT# pin is an active-low open-drain output pin which is triggered when measured
temperature exceeds the limitation defined in the limit registers. There are three types of ALERT#
-5-
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
output mode: the ALERT# output comparator mode, the ALERT# output interrupt mode, and the
TM
ALERT# output SMBus ALERT# mode.
6.5.1
ALERT# Output Comparator Mode
Figure 1 shows the mechanism of the ALERT# output comparator mode. In this mode, the ALERT#
pin will be alerted if the monitored temperature is out-of-limit and the ALERT# pin keeps low until the
temperature goes back to the target range.
Figure 1
6.5.2
ALERT# Output Interrupt Mode
Figure 2 shows the mechanism of the ALERT# output interrupt mode. In this mode, the NCT7509 will
set the ALERT mask bit of Configuration Register during a read of the Status Register if any flag in
Status Register, except the ADC_Busy flag and Remote Diode Open flag, is set. This prevents further
ALERT# triggering until the master has reset the ALERT mask bit (write 0 to Alert_MSK), at the end of
the interrupt service routine. The Status Register flags are cleared only upon a read Status Register
command from the master and will be re-alerted at the end of the next temperature conversion if the
measured temperature still falls outside of the allowed range.
Figure 2
-6-
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
6.5.3
ALERT# Output SMBusTM alert Mode
TM
Figure 3 shows the mechanism of the ALERT# output SMBus alert mode. In this mode, the ALERT#
TM
output of the NCT7509 is connected to the SMBus alert line which has more than one device
TM
connected to it. Through such and implementation, SMBus alert mode can assist the master in
resolving which salve generates an interrupt. When the measured temperature falls outside of the
allowed range, the ALERT# pin will be pulled low and the corresponding alert flags in Status Register
will be set to 1. The ALERT mask bit will just be set if there is a read command for Status Register or
TM
when SMBus ALERT Response Address (ARA) occurs from master (Alert Response Address is
0001100x). Meanwhile, the NCT7509 will generate and return its own address to the master. If the
temperature never falls outside of the allowed range, the latched ALERT# pin can release by the reset
ALERT mask bit and the latched corresponding alert flags in Status Register can release by reading
command for Status Register.
Figure 3
6.6
T_CRIT# Output
T_CRIT# output pulls low when the measured temperature exceeds the critical temperature setting.
Once the T_CRIT# output pulls low, it will not be set high until the measured temperature is lower than
“T_CRIT – TH”, where TH is Temperature Hysteresis. Status Register will not be reset until it is read
and the temperature conversion falls below the T_CRIT set point, the ALERT-MSK bit of Configuration
Register will be set after Status Register read. Figure 4 shows this mechanism.
Figure 4
-7-
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
6.7
FAN_IN Count Calculation
The FAN_IN tachometer high byte and low byte are combined to 12-bitCountValue. Real RPM (Rotate
per Minute) calculation should follow the formula:
FanSpeed ( RPM )
1.35 10 6
(12 bitCountVa lue ) ( FanPoles )
4
In this formula, FanPoles stands for the number of NS pole pairs inside the fan. Normally an N-S-N-S
Fan (FanPoles=4) generates 2 pulses after completing one rotation.
6.8
FAN_OUT Duty Cycle Calculation
The NCT7509 provides 1 set of PWM for fan speed control. The duty cycle of PWM can be
programmed by an 8-bit register. The expression of duty cycle can be represented as follow formula:
Duty cycle(%)
6.9
SMART FANTM IV Control Parameters
In SMART FAN
6.9.1
Programmed 8 - bit Register Value
100%
255
TM
IV Mode, there are some Fan control parameters as below descriptions:
Step Up Time / Step Down Time
TM
SMART FAN IV is designed for the smooth operation of the fan. The Up Time / Down Time register
defines the time interval between successive duty increases or decreases. If this value is set too
small, the fan will not have enough time to speed up after tuning the duty and sometimes may result in
unstable fan speed. On the other hand, if Up Time / Down Time is set too large, the fan may not work
fast enough to dissipate the heat. This register should never be set to 0, otherwise, the fan duty will be
abnormal.
6.9.2
Fan Output Start-up Value
From still to rotate, the fan usually needs a higher fan output value to generate enough torque to
conquer the restriction force. Thus the Fan Output Start-up Value is used to turn on the fan with the
specified output value.
6.9.3
Fan Output Nonstop Value
It takes some time to bring a fan from still to working state. Therefore, Nonstop value are designed
with a minimum fan output to keep the fan working when the system does not require the fan to help
reduce heat but still want to keep the fast response time to speed up the fan.
-8-
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
6.9.4
Fan Output Stop Time
A time interval is specified to turn off the fan if SMART FAN
the fan which has already reached the Stop time.
TM
IV continuously requests to slow down
UpTime
DownTime
NonStop
Start
FanSpeed
StopTime
Smart Fan Arising Fan
Speed
Smart Fan Lowering
FanSpeed
Smart Fan Control Parameters Figure
6.10 Speed Cruise Mode
Fan Speed Cruise mode keeps the fan speed in a specified range. This range is defined by a fan
speed count and an interval (e.g., 160 10). As long as the fan speed count is in the specified range,
fan output remains the same. If the fan speed count is higher than the high end (e.g., 170), fan output
increases to make the count lower. If the fan speed count is lower than the low end (e.g., 150), fan
output decreases to make the count higher. One example is illustrated in this figure.
A
Count
170
C
160
150
(%)
100
Fan
output
50
0
Mechanism of Fan Speed Cruise
-9-
TM
Mode
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
6.11 Thermal Cruise Mode
Thermal Cruise mode is an algorithm to control the fan speed to keep the temperature source around
the Target Temperature of Temperature Inputs. If the temperature source detects temperatures higher
or lower than the target temperatures with Hysteresis of Temperature, Smart Fan Control will take
actions to speed up or slow down the fan to keep the temperature within the tolerance range.
Thermal Cruise mode controls the fan speed to keep the temperature in a specified range. This range
is defined by a temperature and the interval (e.g., 55 C 3 C). As long as the current temperature
remains below the low end of this range (i.e., 52 C), the fan is off. Once the temperature exceeds the
low end, the fan turns on at a start up speed defined (e.g., 20% output). Thermal Cruise mode then
controls the fan output according to the current temperature. Three conditions may occur:
(1) If the temperature still exceeds the high end, fan output increases slowly. If the fan is operating
at full speed but the temperature still exceeds the high end, a warning message is issued to
protect the system.
(2) If the temperature falls below the high end (e.g., 58C) but remains above the low end (e.g., 52
C), fan output remains the same.
(3) If the temperature falls below the low end (e.g., 52 C), fan output decreases slowly to zero or
to a specified “Nonstop value”. This nonstop value is specified in Address 5AHEX. The fan remains
at the nonstop value for the period of time defined in Address 5BHEX.
In general, Thermal Cruise mode means
if the current temperature is higher than the high end, increase the fan speed;
if the current temperature is lower than the low end, decrease the fan speed;
otherwise, keep the fan speed the same.
The following figures illustrate two examples of Thermal Cruise mode.
A
B
C
D
58°C
Tolerance
55°C
Target Temperature
Tolerance
52°C
PWM
Duty
Cycle
(%)
100
Fan Start = 20%
Fan Stop = 10%
Fan Start = 20%
50
0
Stop Time
Mechanism of Thermal Cruise
TM
- 10 -
Mode (PWM Duty Cycle)
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
6.12 SMART FANTM IV & Close Loop Fan Control Mode
TM
SMART FAN
IV and Close Loop Fan Control Mode offer 6 slopes to control the fan speed.
The 6 slopes can be obtained by setting FanDuty/RPM1~FanDuty/RPM7 and T1~T7 through the
registers. When the temperature rises, FAN Output will calculate the target FanDuty/RPM based on
the current slope. For example, assuming Tx is the current temperature and FanDuty/RPMy is the
target, then the slope:
X4
FanDuty5 / RPM 5 FanDuty 4 / RPM 4
T 5 T 4
Fan Output:
T arg et FanDuty or RPM FanDuty 4 or RPM 4 Tx T 4 X 4
FanDuty/FanRPM
(unit RPM = 50)
Critical Hyst.
Operation Hyst.
0xFF
FanDuty7/RPM7
FanDuty6/RPM6
X6
FanDuty5/RPM5
FanDuty/RPMy
FanDuty4/RPM4
X5
X4
FanDuty3/RPM3
X3
FanDuty2/RPM2
X2
Fanduty1/RPM1
X1
T1
T2
T3 T4
T5 T6
T7
Temperature
TCritical
Tx
SMART FAN
TM
IV & Close Loop Fan Control Mechanism
TM
In addition, SMART FAN IV & Close Loop Fan Control can also set up Critical Temperature and
Hysteresis. If the current temperature exceeds Critical Temperature, external fan will be forced by
maximum FanDuty to meet the largest target FanDuty or RPM, Which is 0xFF. The target FanDuty &
RPM value will be determined in accordance to the slope only when the temperature falls below
(TCritical – Criticl Hyst.)
NCT7509 provide 2 temperature source selects to map the fan, the algorithm will make a decision to
control the fan as below figure:
- 11 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
Any Temp request
faster Fan??
Yes
Speed Up
Yes
Hold current
Speed
No
Any Temp request f
hold current speed??
No
Slow Down
6.13 Dynamic Fast Tracking Feature
TM
In the SMART FAN IV & Close Loop Control Mode, in order to have a faster Fan Duty update
response to external temperature variation, NCT7509 involves a Dynamic Fast Tracking mode. That
how fast could be reached is depended on user‟s configuration and how rapid temperature variation.
In addition to independent temperature control method, which means that one external fan would be
controlled by only one temperature source, NCT7509 also support combined temperature control
method. User could conjugate CPU & System temperature with CPU fan to obtain a better thermal
management on the system level through this feature.
Per appropriate configuration, fan control response time could come out following behavior.
CPU Fan RPM
CPU Fan RPM
CPU Fan RPM
CPU Fan RPM
RPM_Target
RPM_Target
RPM_Target
RPM_Target
RPM_Old
RPM_Old
RPM_Old
RPM_Old
Δt
Tracking Time, t
if Tcpu < Tcontrol , Tsys < Tambient
=> Δt α ƒ( Programmable step change )
Δt
Tracking Time, t
Δt
Δt
Tracking Time, t
if Tcpu > Tcontrol , Tsys > Tambient
if Tcpu > Tcontrol , Tsys < Tambient
if Tcpu < Tcontrol , Tsys > Tambient
=> Δt α ƒ( Programmable step change,
weighting ,
(Tsys – Tambient) ,
(RPM_Target - RPM_Old) )
=> Δt α ƒ( RPM_Target - RPM_Old )
=> Δt α ƒ( Programmable step change,
weighting,
( Tsys – Tambient ) )
Tracking Time, t
In this demonstration, CPU & System temperature will link to CPU fan response.
- 12 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
7. REGISTER SUMMARY
7.1
Register Map
Idx Register Name
Attr Dft
7
6
5
4
3
2
1
0
0
LDT Readout
RO
00
MNTREG_LT[7:0]
1
RT1 Temp MSB
RO
00
MNTREG_RT1[10:3]
2
Alert Status
RO
00
ADC_Busy
STS_LTHA
Reserved
STS_RT1HA
STS_RT1LA
STS_RT1O
STS_RT1C
STS_TACH
3
Configuration [R]
RW
15
ALERT_MSK
STOP_Mnt
DIS_FANOUT
EN_FANIN
Reserved
EN_RT1
EN_WTC
EN_FaultQue
ue
4
Conversion Rate
[R]
RW
08
5
LT Alert Temp [R]
RW
46
6
Reserved
7
RT1 High Alert
Temp MSB [R]
RW
46
RT1_HAT[10:3]
8
RT1 Low Alert
Temp MSB [R]
RW
D8
RT1_LAT[10:3]
9
Configuration [W]
RW
15
A
Conversion Rate
[W]
RW
08
RW
46
B LT Alert Temp [W]
Reserved
ConvRate[3:0]
LT_HAT[7:0]
Reserved
ALERT_MSK
STOP_Mnt
DIS_FANOUT
EN_FANIN
EN_RT1
Reserved
EN_WTC
LT_HAT[7:0]
Reserved
RW
46
RT1_HAT[10:3]
RT1_LAT[10:3]
E
RT1 Low Alert
Temp MSB [W]
RW
D8
F
One Shot
Conversion
WO
FF
10 RT1 Temp LSB
RO
00
11
RT1 Offset Temp
MSB
RW
00
12
RT1 Offset Temp
LSB
MNTREG_RT1[2:0]
Reserved
OFFSET_RT1[10:3]
RW
00
OFFSET_RT1[2:0]
Reserved
RT1 High Alert
13
Temp LSB
RW
00
RT1_HAT[2:0]
Reserved
RT1 Low Alert
Temp LSB
RW
00
RT1_LAT[2:0]
Reserved
16 Alert Mask
RW
06
19 RT1 Critical Temp
RW
--
14
EN_FaultQue
ue
ConvRate[3:0]
C Reserved
RT1 High Alert
D
Temp MSB [W]
Reserved
MSK_LTH
Reserved
MSK_RT1H
MSK_RT1L
Reserved
MSK_RT1C
MSK_TACH
RT1_CT[7:0]
20 Reserved
Reserved
21
Critical Temp
Hysteresis
RW
0A
2D
Customer Data
Log Register 1
RW
00
CustomerLogReg1[7:0]
2E
Customer Data
Log Register 2
RW
00
CustomerLogReg2[7:0]
2F
Customer Data
Log Register 3
RW
00
CustomerLogReg3[7:0]
40
FAN Count
Readout MSB
RO
00
FANIN[11:4]
41
FAN Count
Readout LSB
RO
00
42 FAN Count High
RW
FF
Reserved
CTH[4:0]
FANIN[3:0]
Reserved
FANIN_HL[11:4]
- 13 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
Idx Register Name
Attr Dft
7
6
5
4
3
2
1
0
Limit MSB
FAN Count High
Limit LSB
RW
E0
44 FanctrlDutyCycle
RW
80
Configuration
45
Register 1
RW
46
Configuration
Register 2
47
43
FANIN_HL[3:0]
Reserved
FANDuty
EN_ShareMode
EN_SpeedCruise
Temp1FanSelect
FanControlMode
Temp2_Sour_Sel
Temp1_Sour_Sel
00
Share_Sour_Temp2
Share_Sour_Temp1
RW
10
Reserved
Temp2FanSelect
Configuration
Register 3
RW
A1
PWMPOL
48
Configuration
Register 4
RW
00
49
Dynamic feature
Register 1
RW
4A
Dynamic feature
Register 2
RW
4B
Dynamic feature
Register 3
RW
35
DownFan_Tol_FanDuty
Weight_SYS
Reserved
4C
Dynamic feature
Register 4
RW
52
Unstable_Depth
StepCng_Up
StepCng_Down
Dynamic feature
4D
Register 5
RW
02
FCount_FDuty_Weight_High
(Twodimension = 1)
FCount_FDuty_Step_High (Twodimension = 1)
4E
Dynamic feature
Register 6
RW
02
FCount_FDuty_Weight_Mid
(Twodimension = 1)
FCount_FDuty_Step_Mid
(Twodimension = 1)
4F
Dynamic feature
Register 7
RW
04
FCount_FDuty_Weight_Low (Twodimension = 1)
FCount_FDuty_Step_Low
(Twodimension = 1)
50
Dynamic feature
Register 8
RW
0A
Generic_Tol_FanInCount
51
Dynamic feature
Register 9
RW
99
RPM_Boundary_High[7:0]
52
Dynamic feature
Register 10
RW
1C
RPM_Boundary_Low[7:0]
53
Dynamic feature
Register 11
RW
12
54
Dynamic feature
Register 12
RW
05
DownFan_Tol_ FanInCount_High[7:0]
55
Dynamic feature
Register 13
RW
0A
DownFan_Tol_FanInCount_Low[7:0]
56
Fanctl Step Up
Time
RW
0A
UpTime
Fanctl Step Down
57
Time
RW
0A
DownTime
58 PWM1 Prescalar
RW
84
Fanctl Start Duty
59
Cycle
RW
30
StartDutyCycle
Reserved
Reserved
TwoDimension
Tbound
3C
RPM_Boundary_High[11:8]
RPM_Boundary_Low[11:8]
CKSEL
FanOutDivisor[6:0]
Fanctl Nonstop
Duty Cycle
RW
10
NonStopDutyCycle
5B
Stop Time of
Fanctl
RW
FF
StopTime
5C
FANIN Target
speed (HB)
RW
60
TargetFanInCount[11:4]
5D
FANIN Target
speed (LB)
RW
00
TargetFanInCount[3:0]
5E
Target Speed
Tolerance
RW
10
Reserved
RW
FastTracking
Tcontrol
50
5A
Temp1 Target
5F
Temperature
SimpleMode
Reserved
TOL_FanInCount[5:0]
46
TargetTemp1
Temp2 Target
60
Temperature
RW
61 Temp1 Hysteresis
RW
2B
Reserved
Criti_HysT1
Oper_HysT1
62 Temp2 Hysteresis
RW
2B
Reserved
Criti_HysT2
Oper_HysT2
46
TargetTemp2
- 14 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
Idx Register Name
Attr Dft
Table 1 Transition
Point 1
RW
0A
Table 1 Transition
64
Point 2
RW
14
Table 1 Transition
65
Point 3
RW
1E
Table 1 Transition
66
Point 4
RW
28
Table 1 Transition
67
Point 5
RW
32
Table 1 Transition
68
Point 6
RW
3C
Table 1 Transition
Point 7
RW
55
63
69
Table 1 Critical
6A
Point
RW
Table 1 Y-axis
6B
Transition Point 1
6C
6D
7
6
5
4
3
1
0
Temp1Table_TR1
Temp1Table_TR2
Temp1Table_TR3
Temp1Table_TR4
Temp1Table_TR5
Temp1Table_TR6
Temp1Table_TR7
5A
Temp1Table_TRCritical
RW
28
Temp1Table_FL1
Table 1 Y-axis
Transition Point 2
RW
50
Temp1Table_FL2
Table 1 Y-axis
Transition Point 3
RW
78
Temp1Table_FL3
Table 1 Y-axis
6E
Transition Point 4
RW
96
Temp1Table_FL4
6F
Table 1 Y-axis
Transition Point 5
RW
B4
Temp1Table_FL5
70
Table 1 Y-axis
Transition Point 6
RW
D2
Temp1Table_FL6
71
Table 1 Y-axis
Transition Point 7
RW
F0
Temp1Table_FL7
72
Table 2 Transition
Point 1
RW
19
Table 2 Transition
73
Point 2
RW
1E
Table 2 Transition
74
Point 3
RW
23
Table 2 Transition
75
Point 4
RW
28
Table 2 Transition
76
Point 5
RW
2D
Table 2 Transition
77
Point 6
RW
32
Table 2 Transition
78
Point 7
RW
37
Table 2 Critical
79
Point
RW
Table 2 Y-axis
7A
Transition Point 1
7B
Temp2Table_TR1
Temp2Table_TR2
Temp2Table_TR3
Temp2Table_TR4
Temp2Table_TR5
Temp2Table_TR6
Temp2Table_TR7
3C
Temp2Table_TRCritical
RW
28
Temp2Table_FL1
Table 2 Y-axis
Transition Point 2
RW
50
Temp2Table_FL2
7C
Table 2 Y-axis
Transition Point 3
RW
78
Temp2Table_FL3
7D
Table 2 Y-axis
Transition Point 4
RW
96
Temp2Table_FL4
7E
Table 2 Y-axis
Transition Point 5
RW
B4
Temp2Table_FL5
7F
Table 2 Y-axis
Transition Point 6
RW
D2
Temp2Table_FL6
80
Table 2 Y-axis
Transition Point 7
RW
F0
Temp2Table_FL7
BF
RT Filter & Alert
mode
RW
00
RO
50
FD CID (Chip ID)
2
Reserved
RT1F
Alert_MD
50h
- 15 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
Idx Register Name
Attr Dft
7
6
5
4
3
FE VID (Vendor ID)
RO
50
50h
FF DID (Device ID)
RO
9x
9xH (x=0,1,2…)
7.2
2
1
0
Register Detail
7.2.1
Local Diode Temperature Readout Register
Location : Address 00h
Type : Read Only
Power on default value : 00
BIT
7
5
4
3
2
1
0
Local Diode Temperature Readout Value. The real temperature value calculation is
referred to TEMPERATURE MEASUREMENT DATA FORMAT.
Name
Value
7.2.2
6
SIGN
64
32
16
8
4
2
1
2
1
0
Remote Diode 1 Temperature Readout (MSB) Register
Location : Address 01h
Type : Read Only
Power on default value : 00
BIT
7
5
4
3
Remote Diode 1 Temperature Readout Value. The real temperature value calculation is
referred to TEMPERATURE MEASUREMENT DATA FORMAT.
Name
Value
7.2.3
6
SIGN
64
32
16
8
4
2
1
Alert Status Register
Location : Address 02h
Type : Read Only
Power on default value : 00
BIT
7
6
5
4
3
2
1
0
Name
ADC_Busy
STS_LTHA
Reserved
STS_RT1HA
STS_RT1LA
STS_RT1O
STS_RT1C
STS_TACH
Default
0
0
0
0
0
0
0
BIT
FLAG NAME
DESCRIPTION
7
ADC_Busy
If set to „1‟ indicates ADC is busy converting.
6
STS_LTHA
If set to „1‟ indicates a measured Local Diode Temperature Higher than Local
High set point (High Limit).
5
Reserved
4
STS_RT1HA
If set to „1‟ indicates a measured Remote Diode1 Temperature higher than
Remote High set point (High Limit).
- 16 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
BIT
FLAG NAME
3
STS_RT1LA
If set to „1‟ indicates a measured Remote Diode1 Temperature lower than
Remote Low set point (Low Limit).
2
STS_RT1O
If set to „1‟ indicates a Remote Diode1 disconnect.
1
STS_RT1C
If set to „1‟ indicates a Remote Diode1 Critical Temperature alarm.
0
STS_TACH If set to „1‟ indicates Tachometer count is higher than Tachometer Limit.
7.2.4
DESCRIPTION
Configuration Register
Location : Address 03h and 09h
Type : Read/Write
Power on default value : 15
BIT
7
6
5
4
3
2
1
0
Name
ALERT_
MSK
STOP_
Mnt
DIS_FA
NOUT
EN_FAN
IN
RESER
VED
EN_RT1
EN_WT
C
EN_Faul
tQueue
Default
0
0
0
1
1
0
1
BIT
DESCRIPTION
ALERT_MSK – ALERT# function is enable
7
0 = Enable
1 = Disable
STOP_Mnt – Stop Monitor and entry Standby
6
0 = Monitor
1 = Stop Monitor
DIS_FANOUT– Disable PWM FANOUT.
5
0 = Enable PWM FANOUT
1 = Disable PWM FANOUT
EN_FANIN– Enable FANIN monitoring.
4
0 = Disable
1 = Enable
EN_RT1 – Enable Remote Diode 1 monitoring.
2
0 = Disable
1 = Enable
EN_WTC– Enable Override POR Value of Critical Temperature
1
0 = Disable
1 = Enable
EN_FaultQueue– Enable Fault Queue function
0
0 = Disable. ALERT# and T_CRIT# will be generated if monitor result of any channel is
above or below high/low setting point.
1 = Enable. ALERT# and T_CRIT# will be generated if monitor result of any channel is
- 17 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
BIT
DESCRIPTION
consecuite three times above or below high/low setting point.
7.2.5
Conversion Rate Register
Location : Address 04h and 0Ah
Type : Read/Write
Power on default value : 08
BIT
7
6
Name
5
4
3
Reserved
1
0
0
0
ConvRate
Default
7.2.6
2
1
0
BIT
FREQUENCY/TIME
00h
0.0625Hz / 16sec
01h
0.125Hz / 8sec
02h
0.25Hz / 4sec
03h
0.5Hz / 2sec
04h
1Hz / 1sec
05h
2Hz / 0.5sec
06h
4Hz / 0.25sec
07h
8Hz / 0.125sec
08h
16Hz / 0.0625sec
09h-FFh
Reserved
Local Diode Temperature Alert Temperature Register
Location : Address 05h and 0Bh
Type : Read/Write
Power on default value : 46
BIT
7
6
5
Name
Value
3
2
1
0
4
2
1
LDT Alert Temperature
SIGN
64
32
16
8
46HEX (70℃)
Default
7.2.7
4
Remote Diode 1 Temperature High Alert Temperature (MSB) Register
Location : Address 07h and 0Dh
Type : Read/Write
Power on default value : 46
BIT
Name
7
6
5
4
3
2
1
0
RT1 High Alert Temperature High Byte
- 18 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
Value
SIGN
64
32
8
4
2
1
46HEX (70℃)
Default
7.2.8
16
Remote Diode 1 Temperature Low Alert Temperature (MSB) Register
Location : Address 08h and 0Eh
Type : Read/Write
Power on default value : D8
BIT
7
6
Name
Value
5
4
2
1
0
2
1
RT1 Low Alert Temperature High Byte
SIGN
64
32
16
8
4
D8HEX (-40℃)
Default
7.2.9
3
One Shot Conversion Register
Location : Address 0Fh
Type : Write Only
BIT
7-0
DESCRIPTION
One Shot Conversion – When enter Stop Monitor state, to fill any value into this
register will trigger one temperature conversion cycle.
7.2.10 Remote Diode 1 Temperature Readout (LSB) Register
Location : Address 10h
Type : Read Only
Power on default value : 00
BIT
Name
7
6
5
4
3
Remote Diode 1 Temperature Readout Value. The
real temperature value calculation is referred to
TEMPERATURE MEASUREMENT DATA FORMAT.
Value
0.5
0.25
2
1
0
Reserved
0.125
0
7.2.11 Remote Diode 1 Temperature Offset Register (MSB) Register
Location : Address 11h
Type : Read/Write
Power on default value : 00
BIT
7
6
Name
Value
Default
5
4
3
2
1
0
4
2
1
RT1 OFFSET VALEU High Byte
SIGN
64
32
16
8
00HEX
- 19 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
7.2.12 Remote Diode 1 Temperature Offset Register (LSB) Register
Location : Address 12h
Type : Read/Write
Power on default value : 00
BIT
7
6
5
Name
4
3
2
1
0
RT1 OFFSET VALUE Low Byte
Value
0.5
0.25
0.125
Default
00HEX
7.2.13 Remote Diode 1 Temperature High Alert Temperature (LSB) Register
Location : Address 13h
Type : Read/Write
Power on default value : 00
BIT
7
6
5
Name
4
3
2
1
0
1
0
RT1 High Alert Temperature Low Byte
Value
0.5
0.25
0.125
Default
00HEX
7.2.14 Remote Diode 1 Temperature Low Alert Temperature (LSB) Register
Location : Address 14h
Type : Read/Write
Power on default value : 00
BIT
7
6
5
Name
4
3
2
RT1 Low Alert Temperature Low Byte
Value
0.5
0.25
0.125
Default
00HEX
7.2.15 Alert Mask Register
Location : Address 16h
Type : Read/Write
Power on default value : 06
BIT
7
Name
MSK_LTH
Default
0
BIT
7
6
5
Reserved
4
3
2
1
0
MSK_RT1H
MSK_RT1L
Reserved
MSK_RT1C
MSK_TACH
0
0
1
0
DESCRIPTION
MSK_LTH – Local Diode Temperature High Alert Mask
0 = Alert is not masked
- 20 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
BIT
DESCRIPTION
1 = Alert is masked
4
MSK_RT1H– Remote Diode 1 Temperature High Alert Mask
0 = Alert is not masked
1 = Alert is masked
3
MSK_RT1L– Remote Diode 1 Temperature Low Alert Mask
0 = Alert is not masked
1 = Alert is masked
1
MSK_RT1C– Remote Diode 1 Temperature Critical Mask
0 = Alert is not masked
1 = Alert is masked
0
MSK_TACH– Fan Tachometer Alert Mask
0 = Alert is not masked
1 = Alert is masked
7.2.16 Remote Diode 1 Critical Temperature Register
Location : Address 19h
Type : Read/Write
Power on default value : Power on trapping after power up 100ms
BIT
7
Name
Value
6
5
4
3
2
1
0
RT1 Critical Temperature
The format of Temperature is 8-bit 2‟s complement and the range is –128℃~127℃.
SIGN
64
Default
32
16
8
4
2
1
Hardware Strapping
The default value is trapping after power up 100ms by different pull-up resistors of ALERT# pin :
PULL-UP RESISTOR
TEMPERATURE (℃)
2KΩ
75
90
100
105
110
7.5KΩ
ALERT#
10.5KΩ
14KΩ
18.7KΩ
- 21 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
7.2.17 Critical Temperature Hysteresis Register
Location : Address 21h
Type : Read/Write
Power on default value : 0A
BIT
Name
7
6
5
4
3
2
1
0
4
2
1
3
2
1
0
3
2
1
0
Critical Temperature Hysteresis
The format of Temperature is 5-bit integer and the range is 0℃~31℃.
Value
16
8
0AHEX (10℃)
Default
7.2.18 Customer Data Log Registers
Location : Address 2Dh
2Eh
2Fh
Type : Read/Write
Power on default value : 00
BIT
Name
7
6
5
4
Customer Data Log Register
Default
00HEX
7.2.19 Fan Count Readout (MSB) Register
Location : Address 40h
Type : Read Only
Power on default value : 00
BIT
Name
7
6
5
4
FANIN tachometer readout high byte. The real FANIN RPM value calculation is
referred to FANIN COUNT CACLULATION description.
12-bitCount Value bit[11:4]
7.2.20 Fan Count Readout (LSB) Register
Location : Address 41h
Type : Read Only
Power on default value : 00
BIT
Name
7
6
5
4
3
FANIN tachometer readout low byte
2
1
0
Reserved.
12-bitCount Value bit [3:0]
- 22 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
7.2.21 Fan Count High Limit (MSB) Register
Location : Address 42h
Type : Read/Write
Power on default value : FF
BIT
7
6
5
4
3
2
1
0
FANIN_HL
Name
FANIN tachometer count limit (high byte). The real FANIN RPM count limit value
calculation is referred to FANIN COUNT CACLULATION description.
12-bitCount Value bit[11:4]
Default
FFHEX
7.2.22 Fan Count High Limit (LSB) Register
Location : Address 43h
Type : Read/Write
Power on default value : EE
BIT
7
6
5
4
3
2
FANIN_HL_LSB
Name
1
0
1
0
Reversed
FANIN tachometer count limit (lowe byte).
12-bitCount Value bit [3:0]
Default
EEHEX
7.2.23 Fanctrl Duty Cycle Register
Location : Address 44h
Type : Read / Write (in Manual Mode)
Read Only (in the Smart Fan mode)
Power on default value : 80
BIT
7
6
5
4
3
Name
FANDuty
Default
80HEX
BIT
DESCRIPTION
2
FANDuty – Current Fanctrl output value.
7-0
In Manual Mode, programming this register to set desired PWM duty cycle.
TM
In Thermal Cruise or SMART FAN
PWM duty cycle and is Read Only.
IV algorithm, this register reveals the current
- 23 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
7.2.24 Generic Fan Control Configuration Register 1 (GFCCR1) Register
Location : Address 45h
Type : Read/Write
Power on default value : 00
BIT
Name
7
6
5
4
Share_Sour_Temp2
3
2
Share_Sour_Temp1
Default
00HEX
BIT
DESCRIPTION
1
0
EN_ShareMode
EN_SpeedCruise
Share_Sour_Temp2 : Select which temperature source could share control table in
TM
SMART FAN IV mode
7-5
001 : Local temperature will be referred to SMART FAN
TM
IV control table 2
010 : Remote 1 temperature will be referred to SMART FAN
TM
IV control table 2
Others : Reserved
Share_Sour_Temp1 : Select which temperature source could share control table in
TM
SMART FAN IV mode
4-2
001 : Local temperature will be referred to SMART FAN
TM
IV control table 1
010 : Remote 1 temperature will be referred to SMART FAN
TM
IV control table 1
Others : Reserved
EN_ShareMode : Enable sharing table function in SMART FAN
1
TM
IV control mode
0 = Disable
1 = Enable
EN_SpeedCruise : Apply Speed Cruise
0
TM
mode to FANCTL
0 = Fan control mode is decide by GFCCR2 register. (Default)
1 = FANCTL is applies to Speed Cruise
TM
control for FANIN speed input.
7.2.25 Generic Fan Control Configuration Register 2 (GFCCR2) Register
Location : Address 46h
Type : Read/Write
Power on default value : 10
BIT
Name
7
6
5
Reserved
4
3
2
Temp2FanSelect
Temp1FanSelect
Default
10HEX
BIT
DESCRIPTION
7-4
1
0
FanControlMode
Reserved.
- 24 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
BIT
DESCRIPTION
Temp2 FanSelect : Decide temp2 whether effect FANCTRL or not.
3
0 = Independent
1 = Dependent
Temp1 FanSelect : Decide temp1 whether effect FANCTRL or not.
2
0 = Independent
1 = Dependent
FanControlMode : From temperature view, decide Fan Control mode
00 : Temp2 & Temp1 practice thermal cruise algorithm
1-0
01: Temp2 practices thermal cruise algorithm and Temp1 is SMART FAN
algorithm
TM
IV
Others : Reserved
7.2.26 Generic Fan Control Configuration Register 3 (GFCCR3) Register
Location : Address 47h
Type : Read/Write
Power on default value : A1
BIT
7
6
Name
PWMPOL
Reserved
5
4
3
Temp2_Sour_Sel
Default
A1HEX
BIT
DESCRIPTION
2
1
0
Temp1_Sour_Sel
PWMPOL : Control FANCTL PWM output polarity.
7
0 = Low active. PWM is controlled by negative duty cycle.
1 = High active. (Default). PWM is controlled by positive duty cycle.
6
Reserved
Temp2_Sour_Sel : Temperature source selection for Table2 in SMART FAN
algorithm
5-3
TM
IV
TM
IV
001 = Local temperature
010 = Remote temperature 1
Others : Reserved
Temp1_Sour_Sel : Temperature source selection for Table1 in SMART FAN
algorithm
2-0
001 = Local temperature
010 = Remote temperature 1
Others : Reserved
- 25 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
7.2.27 Generic Fan Control Configuration Register 4 (GFCCR4) Register
Location : Address 48h
Type : Read/Write
Power on default value : 00
BIT
7
6
Name
5
4
3
Reserved
2
1
0
TwoDimension
SimpleMode
FastTracking
Default
00HEX
BIT
DESCRIPTION
7-3
Reserved
2
TwoDimension : Close-Loop Fan Control mode ( RPM to Temperature ) enabling
1 = RPM to Temperature control
0 = FanDuty to Temperature control
1
SimpleMode : Select the type of Fan Duty change rate. It‟s available only with Fast
Tracking = 1.
0 : Fan Duty change rate is dynamic
1 : Fan Duty change rate is programmable. Set by StepCng_Up & StepCng_Down
0
FastTracking : Enable fast tracking mode
0 : Fan Duty change rate is one step.
1 : Fan Duty change rate is programmable or dynamic depended on Simple Mode
7.2.28 Dynamic Close Loop Fan Control Configuration Registers
Location : Address 49h
4Ah
4Bh
4Ch
4Dh
4Eh
4Fh
50h
51h
52h
53h
54h
55h
Type : Read/Write
Power on default value : Refer to below tables
Address 49h
BIT
7
6
5
4
3
2
1
0
Name
Tcontrol
Default
50HEX
BIT
DESCRIPTION
7-0
Tcontrol : Once CPU temperature is over this setting, dynamic fan duty change rate
is activated
Address 4Ah
BIT
7
6
5
4
3
Name
Tbound
Default
3CHEX
- 26 -
2
1
0
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
BIT
DESCRIPTION
7-0
Tbound : Once System temperature is over this setting, dynamic fan duty change rate
is activated
Address 4Bh
BIT
7
Name
6
5
4
3
DownFan_Tol_FanDuty
2
1
Weight_SYS
Default
35HEX
BIT
DESCRIPTION
0
Reserved
DownFan_Tol_FanDuty : Tracking tolerance of FanDuty while FanDuty is decreasing
7-4
1111 : 15
/ .... /
0000 : 0
Ex : Setting 3 => Final FanDuty = (Target FanDuty + 3)
descending.
3–2
1-0
while FanDuty is
Weight_STS : Multiplication factor of System fan; the tracking speed of CPU fan
responds to this setting.
00 : 0.25
01 : 0.5
10 : 1
11 : 2
Reserved
Address 4Ch
BIT
Name
7
6
Reserved
5
4
3
StepCng_Up
Default
52HEX
BIT
DESCRIPTION
2
1
0
StepCng_Down
7-6
Reserved
5-3
StepCng_Up : Fixed increasing step of fan duty; only available with Simple Mode = 1
2-0
StepCng_Down : Fixed decreasing step of fan duty; only available with Simple Mode
=1
- 27 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
Address 4Dh
BIT
Name
7
6
5
4
FCount_FDuty_Weight_High
3
2
1
0
FCount_FDuty_Step_High
Default
02HEX
Bit
Description
7-6
FCount_FDuty_Weight_High : Multiplication factor of dynamic fan duty change rate for
high RPM input
5-0
FCount_FDuty_Step_High : Addition factor of dynamic fan duty change rate for high
RPM input
Address 4Eh
BIT
Name
7
6
5
FCount_FDuty_Weight_Mid
4
3
2
1
0
FCount_FDuty_Step_Mid
Default
02HEX
BIT
DESCRIPTION
7-6
FCount_FDuty_Weight_Mid : Multiplication factor of dynamic fan duty change rate for
middle RPM input
5-0
FCount_FDuty_Step_Mid : Addition factor of dynamic fan duty change rate for middle
RPM input
Address 4Fh
BIT
Name
7
6
5
FCount_FDuty_Weight_Low
4
3
2
1
0
FCount_FDuty_Step_Low
Default
04HEX
BIT
DESCRIPTION
7-6
FCount_FDuty_Weight_Low : Multiplication factor of dynamic fan duty change rate for
low RPM input
5-0
FCount_FDuty_Step_Low : Addition factor of dynamic fan duty change rate for low
RPM input
- 28 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
Address 50h
BIT
7
6
5
4
3
Name
Generic_Tol_FanInCount
Default
0AHEX
BIT
DESCRIPTION
7-0
2
1
0
Generic_Tol_FanInCount : Tracking tolerance of input Fan Count under Two
Dimension = 1
Ex : Setting 3 =>
If current FANIN count = (Target FANIN count - 3) ~ (Target FANIN count + 3) then
FanDuty will be maintained
Address 51h
BIT
7
6
5
4
3
2
1
0
Name
RPM_Boundary_High[7:0]
Default
99HEX
BIT
DESCRIPTION
7-0
RPM_Boundary_High[7:0] : Low byte of high RPM speed boundary setting. It must be
fan count format
Ex : Fan Count = 1350,000 / RPM
Address 52h
BIT
7
6
5
4
3
Name
RPM_Boundary_Low[7:0]
Default
1CHEX
BIT
DESCRIPTION
7-0
2
1
0
RPM_Boundary_Low[7:0] : Low byte of low RPM speed boundary setting. It must be
fan count format
Ex : Fan Count = 1350,000 / RPM
Address 53h
BIT
Name
7
6
5
4
3
RPM_Boundary_High[11:8]
2
1
0
RPM_Boundary_Low[11:8]
Default
12HEX
BIT
DESCRIPTION
7-0
RPM_Boundary_High[11:8] : High byte of high RPM speed boundary setting. It must
be fan count format
RPM_Boundary_Low[11:8] : High byte of low RPM speed boundary setting. It must be
fan count format
- 29 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
Ex : Fan Count = 1350,000 / RPM
Address 54h
BIT
7
6
5
4
3
2
Name
DownFan_Tol_FanInCount_High
Default
05HEX
BIT
DESCRIPTION
1
0
DownFan_Tol_FanInCount_High : Tracking tolerance of input Fan Count under high
RPM speed with
7-0
Two Dimension = 1 & Fast Tracking = 1
Ex : Setting 3 =>
If the current FANIN count reaches (Target FANIN count - 3) then tracking stops
Address 55h
BIT
7
6
5
4
3
2
Name
DownFan_Tol_FanInCount_Low
Default
0AHEX
BIT
DESCRIPTION
1
0
DownFan_Tol_FanInCount_Low : Tracking tolerance of input Fan Count under low
RPM speed with
7-0
Two Dimension = 1 & Fast Tracking = 1
Ex : Setting 3 =>
If the current FANIN count reaches (Target FANIN count - 3) then tracking stops
7.2.29 SMART FANTM IV Control Output Step Up Time Register
Location : Address 56h
Type : Read/Write
Power on default value : 0A
BIT
Name
Default
7
6
5
4
3
2
1
0
UpTime (Smart Fan Step Up Time). Unit in 0.1sec. Programmed as the interval of
continuous Fan ramping up.
0AHEX
This register should not be set to 0. Otherwise, the fan duty will be abnormal.
- 30 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
7.2.30 SMART FANTM IV Control Output Step Down Time Register
Location : Address 57h
Type : Read/Write
Power on default value : 0A
BIT
Name
7
6
5
4
3
2
1
0
DownTime (Smart Fan Step Down Time). Unit in 0.1sec. Programmed as the interval
of continuous Fan ramping Down.
Default
0AHEX
This register should not be set to 0. Otherwise, the fan duty will be abnormal.
7.2.31 Fan Output PWM Frequency Prescalar Register
Location : Address 58h
Type : Read/Write
Power on default value : 84
BIT
7
6
Name
CKSEL
Default
1
5
4
3
2
1
0
1
0
0
FanOutDivisor
0
0
0
0
A wide range of clocks can be selected to satisfy customer needs. The default output frequency is
around 25 KHz.
BIT
7
6-0
DESCRIPTION
CLKSEL
BASE Frequency
0
1.024KHz
1
125KHz
Divisor – Clock frequency Divisor.
There are 2 divisors depending on CKSEL :
If CKSEL equals 1, then the output clock is simply equal to 125/ (Divisor+1) KHz .
If CKSEL equals 0, the output clock is 1.024KHz/MappedDivisor.
MappedDivisor depends on Divisor[3:0] and is described in the table below.
DIVISOR[3:0]
MAPPED
DIVISOR
OUTPUT
FREQUENCY
DIVISOR[3:0]
MAPPED
DIVISOR
OUTPUT
FREQUENCY
0000
1
1024Hz
1000
12
85Hz
0001
2
512Hz
1001
16
64Hz
0010
3
341Hz
1010
32
32Hz
0011
4
256Hz
1011
64
16Hz
0100
5
205Hz
1100
128
8Hz
0101
6
171Hz
1101
256
4Hz
0110
7
146Hz
1110
512
2Hz
- 31 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
DIVISOR[3:0]
MAPPED
DIVISOR
OUTPUT
FREQUENCY
DIVISOR[3:0]
MAPPED
DIVISOR
OUTPUT
FREQUENCY
0111
8
128Hz
1111
1024
1Hz
7.2.32 Fan Output Start-up Value Register
Location : Address 59h
Type : Read/Write
Power on default value : 30
BIT
7
6
5
4
3
2
1
Name
FanStartDuty
Default
30HEX
BIT
DESCRIPTION
7-0
FanStartDuty –control the FANCTL fan output start-up value.
0
7.2.33 Fan Output Nonstop Value Register
Location : Address 5Ah
Type : Read/Write
Power on default value : 10
BIT
7
6
5
4
3
2
1
Name
FanNonStop
Default
10HEX
BIT
DESCRIPTION
7-0
FanNonStop – control the FANCTL fan output nonstop value.
0
7.2.34 Fan Output Stop Time Register
Location : Address 5Bh
Type : Read/Write
Power on default value : FF
BIT
7
6
5
4
3
2
1
0
Name
FanStopTime
Default
FFHEX
BIT
DESCRIPTION
7-0
FanStopTime – control the FANCTL fan stop time from Fan Output Nonstop Value to
the off state.
Unit in 0.1sec. Ranges from 0.1sec to 25.5sec.
- 32 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
If set to 0, the fan will never stop.
7.2.35 FANIN Target Speed Register
Location : Address 5Ch 5Dh
Type : Read/Write
Power on default value : Refer to below tables
FANIN Target Speed High Byte
BIT
7
6
5
4
3
2
1
0
FTSH : FANIN tachometer target speed high byte.
Name
The real FANIN RPM value calculation is referred to FANIN COUNT CACLULATION
description.
12-bitCount Value bit[11:4]
Default
60HEX
FANIN Target Speed Low Byte
BIT
7
6
5
4
3
FTSL: FANIN tachometer target speed low byte.
Name
1
0
Reserved.
12-bitCount Value bit [3:0]
Default
2
00HEX
TM
In Fan Speed Cruise mode, each FANIN tachometer has to have a target fan speed. The NCT7509
will try to tune relative fan output to keep the fan speed of target. The default target speed for FANIN
tachometer is 6000HEX .
7.2.36 Tolerance of FANIN Target Speed Register
Location : Address 5Eh
Type : Read/Write
Power on default value : 10
BIT
7
Name
Default
6
5
Reserved
0
5-0
3
2
1
0
Tolerance of FANIN Target Speed
0
0
BIT
7-6
4
1
0
0
0
0
DESCRIPTION
Reserved.
Tolerance of FANIN Target Speed
Tolerance of FANIN tachometer target speed. Tolerance range is 00h~3Fh
- 33 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
7.2.37 Target Temperature of Temperature Input 1 Register
Location : Address 5Fh
Type : Read/Write
Power on default value : 46
BIT
7
6
5
4
3
2
Name
Temp1 Target Temperature.
Default
46HEX (70℃)
1
0
TM
In Thermal Cruise mode, each temperature source has to have a target temperature. The NCT7509
will try to tune the fan output to keep the temperature of the target device around the target
temperature.
7.2.38 Target Temperature of Temperature Input 2 Register
Location : Address 60h
Type : Read/Write
Power on default value : 46
BIT
7
6
5
Name
4
3
2
1
0
Temp2 Target Temperature.
46HEX (70℃)
Default
TM
In Thermal Cruise mode, each temperature source has to have a target temperature. The NCT7509
will try to tune the fan output to keep the temperature of the target device around the target
temperature.
7.2.39 Hysteresis of Temperature Input 1 Register
Location : Address 61h
Type : Read/Write
Power on default value : 2B
BIT
7
6
5
4
3
2
1
0
Name
Reserved
Hysteresis of Critical
Temperature
Hysteresis of Operation
Temperature
Default
00
5HEX (5℃)
3HEX (3℃)
BIT
7-6
DESCRIPTION
Reserved
Set the hysteresis tolerance temperature of SMART FAN
TM
IV Algorithm
000 : 0 ℃
5-3
001 : 1 ℃
010 : 2 ℃
011 : 3 ℃
....
- 34 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
BIT
DESCRIPTION
111 : 7 ℃
Set the hysteresis tolerance temperature of SMART FAN
TM
IV Algorithm
000 : 0 ℃
001 : 1 ℃
2-0
010 : 2 ℃
011 : 3 ℃
....
111 : 7 ℃
TM
In Thermal Cruise and SMART FAN IV mode, to prevent unstable temperatures from throttling the
fan speed, the NCT7509 employs a hysteresis temperature to separate the speed-up/slow-down
temperature points.
7.2.40 Hysteresis of Temperature Input 2 Register
Location : Address 62h
Type : Read/Write
Power on default value : 2B
BIT
7
6
5
4
3
2
1
0
Name
Reserved
Hysteresis of Critical
Temperature
Hysteresis of Operation
Temperature
Default
00
5HEX (5℃)
3HEX (3℃)
BIT
7-6
DESCRIPTION
Reserved
Set the hysteresis tolerance temperature of SMART FAN
TM
IV Algorithm
TM
IV Algorithm
000 : 0 ℃
001 : 1 ℃
5-3
010 : 2 ℃
011 : 3 ℃
....
111 : 7 ℃
Set the hysteresis tolerance temperature of SMART FAN
000 : 0 ℃
001 : 1 ℃
2-0
010 : 2 ℃
011 : 3 ℃
....
111 : 7 ℃
- 35 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
TM
In Thermal Cruise and SMART FAN IV mode, to prevent unstable temperatures from throttling the
fan speed, the NCT7509 employs a hysteresis temperature to separate the speed-up/slow-down
temperature points.
7.2.41 SMART FANTM IV Temperature and PWM Registers Register
Location : Address 63h ~ 80h
Type : Read/Write
Power on default value: Refer to below tables
TM
SMART FAN IV is an algorithm providing a table mapping mechanism to translate the temperature
information into output fan duties or desired Fan speed. The mapping table requires 2 domains for the
translation. In the table, a certain temperature corresponds to a certain duty or RPM. T1-T7
(Temperature) and PWM1-PWM7 (PWM fan output values) are used to define the table. There are
totally two tables reside in the NCT7509.
Relative Register-at SMART FAN
TABLE
Table1
Table2
TM
IV Control Mode Table
NAME
ADDRESS
DEFAULT
TYPE
Transition Point : T1
63HEX
0AHEX
Read/Write
Transition Point : T2
64HEX
14HEX
Read/Write
Transition Point : T3
65HEX
1EHEX
Read/Write
Transition Point : T4
66HEX
28HEX
Read/Write
Transition Point : T5
67HEX
32HEX
Read/Write
Transition Point : T6
68HEX
3CHEX
Read/Write
Transition Point : T7
69HEX
55HEX
Read/Write
Critical Point
6AHEX
5AHEX
Read/Write
Y-axis Transition Point : PWM1
6BHEX
28HEX
Read/Write
Y-axis Transition Point : PWM2
6CHEX
50HEX
Read/Write
Y-axis Transition Point : PWM3
6DHEX
78HEX
Read/Write
Y-axis Transition Point : PWM4
6EHEX
96HEX
Read/Write
Y-axis Transition Point : PWM5
6FHEX
B4HEX
Read/Write
Y-axis Transition Point : PWM6
70HEX
D2HEX
Read/Write
Y-axis Transition Point : PWM7
71HEX
F0HEX
Read/Write
Transition Point : T1
72HEX
19HEX
Read/Write
Transition Point : T2
73HEX
1EHEX
Read/Write
Transition Point : T3
74HEX
23HEX
Read/Write
Transition Point : T4
75HEX
28HEX
Read/Write
Transition Point : T5
76HEX
2DHEX
Read/Write
Transition Point : T6
77HEX
32HEX
Read/Write
Transition Point : T7
78HEX
37HEX
Read/Write
Critical Point
79HEX
3CHEX
Read/Write
Y-axis Transition Point : PWM1
7AHEX
28HEX
Read/Write
Y-axis Transition Point : PWM2
7BHEX
50HEX
Read/Write
Y-axis Transition Point : PWM3
7CHEX
78HEX
Read/Write
- 36 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
TABLE
NAME
ADDRESS
DEFAULT
TYPE
Y-axis Transition Point : PWM4
7DHEX
96HEX
Read/Write
Y-axis Transition Point : PWM5
7EHEX
B4HEX
Read/Write
Y-axis Transition Point : PWM6
7FHEX
D2HEX
Read/Write
Y-axis Transition Point : PWM7
80HEX
F0HEX
Read/Write
T1 – T7
BIT
7
6
TM
5
Name
SMART FAN
Default
Refer to SMART FAN
4
3
2
1
0
3
2
1
0
IV Temperature
TM
IV Control Mode Table
PWM1 – PWM7
BIT
7
6
TM
5
Name
SMART FAN
Default
Refer to SMART FAN
4
IV PWM
TM
IV Control Mode Table
7.2.42 Remote Diode Temperature Filter and Alert Mode Setting Register
Location : Address BFh
Type : Read/Write
Power on default value : 00
BIT
7
Name
6
5
4
3
Reserved
2
1
RT1F
Default
00HEX
BIT
DESCRIPTION
0
ALERT_MD
RT1F – Remote diode temperature 1 filter setting
2-1
00 = No filter selected
01 or 10 = Filter level 1 selected
11 = Filter level 2 selected
ALERT_MD – ALERT mode configuration
0
0 = Interrupt or SMBus
TM
alert mode
1 = Comparator mode
7.2.43 Chip ID Register
Location : Address FDh
Type : Read Only
Power on default value : 50
BIT
DESCRIPTION
- 37 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
7-0
Chip ID.
Chip ID of NCT7509 is 50HEX
7.2.44 Vendor ID Register
Location : Address FEh
Type : Read Only
Power on default value : 50
BIT
7-0
DESCRIPTION
Vendor ID.
Vendor ID of NCT7509 is 50HEX
7.2.45 Device ID Register
Location : Address FFh
Type : Read Only
Power on default value : 9x
BIT
DESCRIPTION
Device ID.
7-0
Device ID of NCT7509 is 9xHEX (x=0,1,2…)
- 38 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
8. ELECTRICAL CHARACTERISTICS
8.1
Absolute Maximum Ratings
PARAMETER
RATING
UNIT
Power Supply Voltage
3.3V 5%
V
Input Voltage
-0.3 to +3.6
V
Operating Temperature
-40 to +125
C
Storage Temperature
-55 to +150
C
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability
of the device.
8.2
DC Characteristics
(Ta = 0 C to 70 C, VDD = 3.3V 5%, GND = 0V)
PARAMETER
SYM.
MIN.
TYP.
MAX.
UNIT
CONDITIONS
OD12 – Open-drain output pin with source-sink capability of 12 mA
Output Low Voltage
INts -
VOL
IOL = 12 mA
0.4
V
0.8
V
VDD = 3.3V
V
VDD = 3.3V
TTL level Schmitt-triggered input pin
Input Low Voltage
VIL
Input High Voltage
VIH
Input High Leakage
ILIH
+10
A
VIN=3.3V
Input Low Leakage
ILIL
-10
A
VIN=0V
2.0
- 39 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
8.3
AC Characteristics
SMBusTM Interface
PARAMETER
SYMBOL
SCL clock period
t SCL
2.5
uS
Start condition hold time
tHD;SDA
1.5
uS
Stop condition setup-up time
tSU;STO
1
uS
DATA to SCL setup time
tSU;DAT
120
nS
DATA to SCL hold time
tHD;DAT
5
nS
SCL and SDA rise time
tR
1.0
uS
SCL and SDA fall time
tF
300
nS
-
MIN.
MAX.
UNIT
9. ORDERING INFORMATION
PART NO.
NCT7509Y
NCT7509W
PACKAGE
SUPPLIED AS
DFN, 10pin
T Shape:
Green package
5,000 units/T&R
MSOP, 10pin
T Shape:
Green package
4,000 units/T&R
- 40 -
PRODUCTION FLOW
Commercial, 0℃ to +70℃
Commercial, 0℃ to +70℃
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
10. TOP MARKING SPECIFICATION
7509W
022GB
7509Y
022GB
st
1 line: Part number: 7509Y means the NCT7509Y
7509W means the NCT7509W
nd
2 line: Assembly tracking code
0 22: packages made in year 2010, week 22
G: Assembly house code
B: Product version
- 41 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
11. PACKAGE DRAWING AND DIMENSIONS
11.1 10L DFN (3X3 MM^2; 0.8 MM)
- 42 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
11.2 10L MSOP (3X3 MM^2)
- 43 -
Release Date: Aug, 2012
Version: 1.0
NCT7509W/NCT7509Y
12. REVISION HISTORY
VERSION
DATE
PAGE
0.1
12/18/2008
N.A.
0.2
5/26/2009
0.5
07/21/2010
2, 41
0.51
07/28/2010
All
0.6
09/15/2010
All
1.0
08/15/2012
All
DESCRIPTION
New create
First released.
Update the key specification and add the top
marking specification
Modify some descriptions
Modify some descriptions
Update the ordering information
All versions before 1.0 are preliminary
versions
Important Notice
Nuvoton Products are neither intended nor warranted for usage in systems or equipment, any
malfunction or failure of which may cause loss of human life, bodily injury or severe property
damage. Such applications are deemed, “Insecure Usage”.
Insecure usage includes, but is not limited to: equipment for surgical implementation, atomic
energy control instruments, airplane or spaceship instruments, the control or operation of
dynamic, brake or safety systems designed for vehicular use, traffic signal instruments, all
types of safety devices, and other applications intended to support or sustain life.
All Insecure Usage shall be made at customer’s risk, and in the event that third parties lay
claims to Nuvoton as a result of customer’s Insecure Usage, customer shall indemnify the
damages and liabilities thus incurred by Nuvoton.
- 44 -
Release Date: Aug, 2012
Version: 1.0
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