NCT7511Y
Nuvoton
H/W Monitoring IC
Date: July/2012
Revision: 1.0
NCT7511Y
Table of Content1.
GENERAL DESCRIPTION ......................................................................................................... 1
2.
FEATURES ................................................................................................................................. 1
2.1
Temperature Measurement ........................................................................................................1
2.2
Fan Speed Monitoring and Control ............................................................................................1
2.3
Event Notification.........................................................................................................................1
2.4
General ........................................................................................................................................1
3.
KEY SPECIFICATIONS .............................................................................................................. 2
4.
PIN CONFIGURATION ............................................................................................................... 2
5.
PIN DESCRIPTION ..................................................................................................................... 3
6.
7.
5.1
PIN TYPE DISCRIPTION ...........................................................................................................3
5.2
PIN DISCRIPTION ......................................................................................................................3
FUNCTION DESCRIPTION ........................................................................................................ 4
6.1
GENERAL DESCRIPTION ........................................................................................................4
6.2
ACCESS INTERFACE ...............................................................................................................4
6.2.1
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 MONITOR DATA FORMAT .........................................................................5
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
6.5
FAN_IN Count Calculation .........................................................................................................5
6.6
FAN_OUT Duty Cycle Calculation .............................................................................................6
6.7
SMART FAN
TM
IV Control Parameters ......................................................................................6
6.7.1
Step Up Time / Step Down Time .............................................................................. 6
6.7.2
Fan Output Start-up Value ........................................................................................ 6
6.7.3
Fan Output Nonstop Value ....................................................................................... 6
6.7.4
Fan Output Stop Time .............................................................................................. 6
TM
6.8
SMART FAN
IV........................................................................................................................7
6.9
ALERT# Output ...........................................................................................................................8
6.9.1
ALERT# Output Mechanism ..................................................................................... 8
6.9.2
ALERT Response Address ....................................................................................... 9
6.10
T_CRIT# Output ..........................................................................................................................9
6.11
SHDN_SEL ............................................................................................................................... 10
6.12
T_CRIT#_SET .......................................................................................................................... 10
REGISTER DESCRIPTION ...................................................................................................... 13
7.1
REGISTER MAP ...................................................................................................................... 13
7.2
REGISTER DETAIL ................................................................................................................. 16
7.2.1
Remote Diode 1 Temperature Readout Register (MSB) ........................................ 16
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7.2.2
Remote Diode 2 Temperature Readout Register (MSB) ........................................ 16
7.2.3
Local Diode Temperature Readout Register (MSB) ............................................... 16
7.2.4
Temperature Readout Register (LSB) .................................................................... 16
7.2.5
Fan Count 1 Readout Register (MSB) .................................................................... 17
7.2.6
Fan Count Readout Register (LSB) ........................................................................ 17
7.2.7
T_CRIT#_SET Point Register................................................................................. 17
7.2.8
Alert Status Register ............................................................................................... 17
7.2.9
Diode Fault Alert Status Register ........................................................................... 18
7.2.10
Low Alert Status Register ....................................................................................... 18
7.2.11
High Alert Status Register ...................................................................................... 18
7.2.12
Fan Alert Status Register........................................................................................ 18
7.2.13
T_CRIT# Alert Status Register ............................................................................... 19
7.2.14
GPIO Alert Status Register ..................................................................................... 19
7.2.15
T_CRIT# Real Time Status Register ...................................................................... 19
7.2.16
Start Register.......................................................................................................... 19
7.2.17
Mode Selection Register......................................................................................... 20
7.2.18
Fan Enable Register ............................................................................................... 20
7.2.19
Conversion Rate Register....................................................................................... 20
7.2.20
Fault Queue Register ............................................................................................. 20
7.2.21
Alert# High Limit Link to T_CRIT# .......................................................................... 21
7.2.22
RTD1 Temperature High Limit Register.................................................................. 21
7.2.23
RTD1 Temperature Low Limit Register .................................................................. 21
7.2.24
RTD2 Temperature High Limit Register.................................................................. 21
7.2.25
RTD2 Temperature Low Limit Register .................................................................. 22
7.2.26
LTD Temperature High Limit Register .................................................................... 22
7.2.27
LTD Temperature Low Limit Register ..................................................................... 22
7.2.28
RTD1 T_CRIT# Threshold Register ....................................................................... 22
7.2.29
RTD2 T_CRIT# Threshold Register ....................................................................... 23
7.2.30
LTD T_CRIT# Threshold Register .......................................................................... 23
7.2.31
FANIN1 Limit Low Byte Register ............................................................................ 23
7.2.32
FANIN1 Limit High Byte Register ........................................................................... 23
7.2.33
ALERT Mask Register Register .............................................................................. 24
7.2.34
ALERT Mask Temperature Channel Register ........................................................ 24
7.2.35
ALERT Mask Fan Channel Register ....................................................................... 24
7.2.36
T_CRIT# Mask Register ......................................................................................... 25
7.2.37
GPIO Alert Mask Register ...................................................................................... 25
7.2.38
GPIO Mode Register .............................................................................................. 25
7.2.39
GPIO Output Type Register.................................................................................... 26
7.2.40
GPIO Input Data Register ....................................................................................... 26
7.2.41
GPIO Output Data Register .................................................................................... 26
7.2.42
Fan Control Output Type Register .......................................................................... 26
7.2.43
Fan Control Output Mode Register ......................................................................... 27
7.2.44
Fan Control 1 Output Value Register ...................................................................... 27
7.2.45
Close-Loop Fan Control RPM mode Register ........................................................ 27
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8.
7.2.46
Temperature to Fan mapping Relationships Register ............................................ 27
7.2.47
Temperature to Fan mapping Relationships Register ............................................ 28
7.2.48
Fan Control Configuration Register 1 ..................................................................... 28
7.2.49
Fan Control Configuration Register 2 ..................................................................... 29
7.2.50
Fan Control Configuration Register 3 ..................................................................... 29
7.2.51
Fan Control Configuration Register 4 ..................................................................... 29
7.2.52
Fan 1 Target Register ............................................................................................. 29
7.2.53
Close-Loop Fan Control RPM Mode Tolerance Register ....................................... 30
7.2.54
FANCTL Step Up Time Register ............................................................................ 30
7.2.55
FANCTL Step Down Time Register ........................................................................ 30
7.2.56
Default Fan Speed Register ................................................................................... 30
7.2.57
FANCTL1 PWM Prescalar Register ....................................................................... 31
7.2.58
Temperature1 Hysteresis Register ......................................................................... 32
7.2.59
Temperature 2 Hysteresis Register ........................................................................ 32
7.2.60
Temperature 3 Hysteresis Register ........................................................................ 32
7.2.61
FANCTL Start Duty Cycle Register ........................................................................ 32
7.2.62
FANCTL Stop Time Register .................................................................................. 33
7.2.63
SMART FAN
7.2.64
TD1 Offset Register ................................................................................................ 34
7.2.65
TD2 Offset Register ................................................................................................ 34
7.2.66
Soft Reset Register ................................................................................................ 34
7.2.67
Vendor ID Register ................................................................................................. 34
7.2.68
Chip ID Register ..................................................................................................... 35
7.2.69
Device ID Register .................................................................................................. 35
TM
IV Temperature and PWM Registers Register .............................. 33
ELECTRICAL CHARACTERISTICS ......................................................................................... 36
8.1
Absolute Maximum Ratings ..................................................................................................... 36
8.2
DC Characteristics ................................................................................................................... 36
8.3
AC Characteristics.................................................................................................................... 37
9.
ORDERING INFORMATION ..................................................................................................... 38
10.
TOP MARKING SPECIFICATION ............................................................................................ 38
11.
TAPING SPECIFICATION ........................................................................................................ 39
12.
PACKAGE DRAWING AND DIMENSIONS .............................................................................. 40
13.
REVISION HISTORY ................................................................................................................ 41
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NCT7511Y
1. GENERAL DESCRIPTION
The NCT7511Y is a Nuvoton Hardware Monitor IC, which can monitor several critical hardware
parameters of the systems, including the temperature and fan speeds, to make the system work stably
and efficiently.
The NCT7511Y supports one on-die and two remote temperature sensors with SMBus interface.
There’s a 10-bit analog-to-digital converter (ADC) is built inside NCT7511Y, to convert the monitored
temperature value. Both of the remote temperature inputs can be connected to CPU/GPU thermal
diode or any diode sensors and thermistor.
TM
The NCT7511Y has 1 fan control groups and two GPIO pins. The SMART FAN IV mode of the fan
speed control provides 4 sets of temperature setting points, and they can also control the duty cycle of
fan outputs. It provides an easy method to implement quiet and cooling solution with maximum safety
and flexibility.
Meanwhile, there’re two pure hardware event pins ALERT# and T_CRIT# for independent alarm
signals, and all threshold values could be set for system protection without timing delay.
2. FEATURES
2.1
Temperature Measurement
Measure the temperature with high accuracy.
One local on-die thermal sensor
Two pairs thermal diode (current mode) temperature channels
2.2
Fan Speed Monitoring and Control
TM
SMART FAN
One fan control output multi-function (PWM/DC mode supported)
One fan tachometer input multi-function
2.3
IV mode or Manual mode to control the fan speed
Event Notification
Supports 2 alarm outputs: ALERT# and T_CRIT# signals to activate system protection.
ALERT# output supports SMBus
T_CRIT# supports Hardware Power-on setting
2.4
TM
2.0 ARA function
General
Two GPIO pins
I C® Compatible System Management bus (SMBus)
3.3V±5% VCC operation
16-pin QFN (Halogen free)
2
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3. KEY SPECIFICATIONS
Temperature Sensor Accuracy
Remote Diode Sensor Accuracy (25~85C)
1C typ.
On-chip Temperature Sensor Accuracy (25~70C)
2C typ.
Remote Temperature Sensor Resolution
0.125 ℃
Local Temperature Sensor Resolution
1℃
Supply Voltage
3.3V 5%
Operating Supply Current
TBD
Operating Temperature Range
*1 Guaranteed by design from -40~85 degree C, 100% tested at 85 degree C.
-40C ~ 85C
*1
SCL
12 11 10
9
GND
FANIN1
FANCTL1
4. PIN CONFIGURATION
SHDL_SEL 13
T_CRIT#_SET 14
TD2- 15
8 SDA
NCT7511Y
3
4
GPIO1
2
VCC
1
TD1+
‧
6 ALERT#
5 GPIO2
TD1-
TD2+ 16
7 T_CRIT#
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5. PIN DESCRIPTION
5.1
PIN TYPE DISCRIPTION
PIN TYPE
PIN ATTRIBUTE
OD12
Open-drain output pin with 12 mA sink capability
INts
TTL level input pin and schmitt trigger
AIN
Input pin (Analog)
OUT12
Output pin with 12 mA sink/source capability
AOUT
Output pin (Analog)
P
5.2
Power or Ground Pin
PIN DISCRIPTION
PIN NO.
PIN NAME
I/O
FUNCTION
1
TD1-
AIN
Connect to Thermal Diode 1 Cathode.
2
TD1+
AIN
Connect to Thermal Diode 1 Anode.
3
VCC
P
4
GPIO1
INts / OD12
General purpose I/O function.
5
GPIO2
INts / OD12
General purpose I/O function.
6
ALERT#
OD12
Alarm output, for interrupt control
7
T_CRIT#
OD12
T_CRIT# alarm output, for interrupt or shutdown
control.
8
SDA
INts/ OD12
9
SCL
INts
SMBus Clock.
10
FANIN1
INts
Fan tachometer input
Power supply, Voltage input 3.3V±5%
SMBus bi-directional data.
It can be configured to PWM/DC mode by
registers. Default is PWM output.
11
FANCTL1
OUT12/ AOUT
12
GND
P
13
SHDN_SEL
AIN
Selects the hardware shutdown channel and
operating mode
14
T_CRIT#_SET
AIN
Voltage input to set the Critical/Thermal Shutdown
threshold
15
TD2-
AIN
Connect to Thermal Diode 2 Cathode.
As DC output, 256 steps output voltage scaled to
0~VCC.
Power supply ground
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NCT7511Y
PIN NO.
PIN NAME
I/O
16
TD2+
AIN
FUNCTION
Connect to Thermal Diode 2 Anode.
6. FUNCTION DESCRIPTION
6.1
GENERAL DESCRIPTION
TM
The NCT7511Y is a SMBus interface device to provide one on-die temperature sensor, two set of
inputs for thermal diode sensors, 1 fan control groups, and two GPIO pins. The NCT7511Y also
provides ALERT# and T_CRIT# alarm signals for event notification.
6.2
ACCESS INTERFACE
NCT7511Y provides SMBus to access the internal register, supports SMBus byte write and byte read
protocols.
6.2.1
Data write to the internal register
6.2.2
Data read from the internal register
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6.3
ADDRESS SETTING
NCT7511Y I2C/SMBus address is 0101110xb (x is R/W bit).
6.4
TEMPERATURE MONITOR DATA FORMAT
6.4.1
6.4.2
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
6.5
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
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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.
6.6
FAN_OUT Duty Cycle Calculation
The NCT7511Y 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(%)
Programmed 8 - bit Register Value
100%
255
SMART FANTM IV Control Parameters
6.7
In SMART FAN
6.7.1
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.
6.7.2
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.
6.7.3
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.
6.7.4
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
Figure 6-1 SMART FAN
TM
Control Parameters
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6.8
SMART FANTM IV
TM
SMART FAN IV supports Fan Duty Outputs Mode and Close Loop Fan Control (RPM) Mode to
control the fan speed.
There’re 3 slopes can be obtained by setting FanDuty/RPM1~FanDuty/RPM4 and T1~T4 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/RPM is the
target, then the slope:
X2
FanDuty3 / RPM 3 FanDuty 2 / RPM 2
T 3 T 2
Fan Output:
T arg et FanDuty or RPM FanDuty 2 or RPM 2 Tx T 2 X 2
Fanduty/RPM
(unit RPM = 50 )
Critical Hyst.
Operation Hyst.
FullSpeed (FF, 100%)
Fanduty4/RPM4
Fanduty3/RPM3
Ty
Fanduty2/RPM2
X3
X2
X1
Fanduty1/RPM1
Temperature
T1
Tx
T2
Figure 6-2 SMART FAN
TM
T3
T4 TRCritical
IV Mechanism
TM
In addition, SMART FAN IV 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.)
NCT7511Y provides 3 temperature source selections to map the fan, the algorithm will make a
decision to control the fan as below figure:
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Any Temp request
faster Fan??
Yes
Speed Up
Yes
Hold current
Speed
No
Any Temp request f
hold current speed??
No
6.9
Slow Down
ALERT# Output
The NCT7511Y 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#
output mode: the ALERT# output comparator mode, the ALERT# output interrupt mode, and the
ALERT# output SMBus ALERT# mode.
6.9.1
ALERT# Output Mechanism
Figure 6-3 shows the mechanism of the ALERT# output. In this mode, the NCT7511Y 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.
Temperature
Value
Temp
Limt
Alert#
Status
Alert
Mask
Read Mask Read Status
register
register
ARA
Figure 6-3 ALERT# Output Mechanism
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6.9.2
ALERT Response Address
Figure 6-4 shows the mechanism of the SMBus ALERT Response Address (ARA) support on ALERT#
output. In this mode, the ALERT# output of the NCT7511Y is connected to the SMBus alert line which
has more than one device 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 when ARA occurs from master (Alert Response Address is 0001100x). Meanwhile,
the NCT7511Y 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 6-4 SMBus ARA Mechanism
6.10 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. Figure 6-5 shows this mechanism.
Figure 6-5 T_CRIT# Output Mechanism
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6.11 SHDN_SEL
The NCT7511Y has a strapping input pin (SHDN_SEL) allowing for configuration of the hardware
Critical/Thermal Shutdown input channel.
The pull-up resistor used on SHDN_SEL pin identifies which configuration setting is used as shown in
table.
PULL-UP RESISTOR（Ω）
MODE / SHUTDOWN CHANNEL
4.7K ~ 10K
RTD1
6.12 T_CRIT#_SET
The NCT7511Y's T_CRIT#_SET pin is an analog input pin to set the Critical/Thermal shutdown
temperature by trapping voltage when system power on. The thermal shutdown temperature is
ranging from 65℃ to 127℃ as shown in table.
Trapping Temp(HEX)
Trapping Temp(DEC)
Trapping Volt(V)
41
65
1.112
41
65
1.144
41
65
1.176
42
66
1.207
43
67
1.239
44
68
1.271
45
69
1.303
46
70
1.334
47
71
1.366
48
72
1.398
49
73
1.430
4a
74
1.461
4b
75
1.493
4c
76
1.525
4d
77
1.557
4e
78
1.589
4f
79
1.620
50
80
1.652
51
81
1.684
52
82
1.716
53
83
1.747
54
84
1.779
55
85
1.811
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Trapping Temp(HEX)
Trapping Temp(DEC)
Trapping Volt(V)
56
86
1.843
57
87
1.875
58
88
1.906
59
89
1.938
5a
90
1.970
5b
91
2.002
5c
92
2.033
5d
93
2.065
5e
94
2.097
5f
95
2.129
60
96
2.160
61
97
2.192
62
98
2.224
63
99
2.256
64
100
2.288
65
101
2.319
66
102
2.351
67
103
2.383
68
104
2.415
69
105
2.446
6a
106
2.478
6b
107
2.510
6c
108
2.542
6d
109
2.573
6e
110
2.605
6f
111
2.637
70
112
2.669
71
113
2.701
72
114
2.732
73
115
2.764
74
116
2.796
75
117
2.828
76
118
2.859
77
119
2.891
78
120
2.923
79
121
2.955
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Trapping Temp(HEX)
Trapping Temp(DEC)
Trapping Volt(V)
7a
122
2.986
7b
123
3.018
7c
124
3.050
7d
125
3.082
7e
126
3.114
7f
127
3.145
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7. REGISTER DESCRIPTION
7.1
REGISTER MAP
Idx
Register Name
Att
1
Read RTD1 MSB
R
MNTRTD1[10:3]
2
Read RTD2 MSB
R
MNTRTD2[10:3]
4
Read LTD MSB
R
MNTLTD[10:3]
5
Read Temp LSB
R
10 Read Fan Count 1MSB
R
13 Read Fan Count 1LSB
R
14
R
16
17
T_CRIT#_SET Point
Interrupt Alert Status
Register
Diode Fault Alert
Status
Df
7
6
5
4
3
MNTTD_Lsb[2:0]
2
1
0
RSV
MNTFAN1[12:5]
MNTFAN_Lsb[4:0]
RSV
T_CRIT#_SET Point
R
RSV
TCRIT
R
GPIO
FAN
High
RSV
18
Low Alert Status
R
RSV
19
High Alert Status
R
RSV
Fault
STS_DF2 STS_DF1
STS_AL4
RSV
STS_AL2 STS_AL1
STS_AH4
RSV
STS_AH2 STS_AH1
RSV
FAN_FC1
RSV
STS_TC2 STS_TC1
FAN_TAR
1
1A
Fan Alert Status
R
1B
T_CRIT# Alert Status
R
1C
GPIO Alert Stuts
R
20
T_CRIT# Real Time
Status
R
21
START
R/W
01
Msk_Alert
22
Mode Selection
R/W
55
RSV
24
Fan Enable
R/W
01
26
Conversion Rate
R/W
02
RSV
ConvRate[1:0]
27
Fault Queue
R/W
03
RSV
FaultQueue[1:0]
28
Alert High link to
T_CRIT#
R/W
00
30 RTD1 Temp High Limit R/W
55
RTD1_HL
31
RTD1 Temp Low Limit R/W
00
RTD1_LL
32 RTD2 Temp High Limit R/W
55
RTD2_HL
33 RTD2 Temp Low Limit R/W
00
RTD2_LL
36
LTD Temp High Limit
R/W
55
LTD_HL
37
LTD Temp Low Limit
R/W
00
LTD_LL
R/W
64
T_CRIT#_RTD1
R/W
64
T_CRIT#_RTD2
R/W
64
T_CRIT#_LTD
49 FANIN1 Limit low Byte R/W
FF
FANIN1_HL[7:0]
4C FANIN1 Limit high byte R/W
F8
3A
3B
3D
4F
RTD1 T_CRIT#
Threshold
RTD2 T_CRIT#
Threshold
LTD T_CRIT#
Threshold
Alert Mask function
R/W
RSV
Low
RSV
STS_TC4
RSV
RSV
7F
LTD_Texc
RSV
STS_GPI STS_GPI
O2
O1
RTD2_Te RTD1_Te
xc
xc
RSV
EnLTD
RSV
START
RTD2_MD
RTD1_MD
RSV
RSV
EnFan1
SYS3
FANIN1_HL[12:8]
Msk_Alert
Msk_TC
Msk_GPI Msk_TAR
Msk_FC
O
T
Confidential
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SYS2
SYS1
RSV
Msk_AH
Msk_AL
Msk_DF
July, 2012
Version: 1.0
NCT7511Y
Idx
Register Name
Att
Alert / SMI Mask Temp
50
R/W
Channel
Alert / SMI Mask FAN
51
R/W
Channel
Df
7
6
3F
5
4
RSV
Msk_LTD
07
T_CRIT# Mask
R/W
BF
54
GPIO Alert Mask
R/W
3F
RSV
56
GPIO mode
R/W
3F
RSV
57
GPIO output type
R/W
00
RSV
58
GPIO input data
R
59
GPIO output data
R/W
00
R/W
00
R/W
00
RW
7F
RW
00
RW
00
RW
00
5F
60
63
64
65
66
67
68
69
Fan Control Output
Type
Fan Control Output
Mode
Fan Control 1 Output
Value
Close-Loop Fan
Control RPM mode
Register
Temperature to Fan
mapping Relationships
Temperature to Fan
mapping Relationships
Configuration Register
1
Configuration Register
2
Configuration Register
3
Configuration Register
4
1
RSV
Msk_ALL
RSV
Msk_LTD
Msk_RTD Msk_RTD
2
1
Msk_GPI Msk_GPI
O2
O1
GPIO2
GPIO1
Mode
Mode
GPIO2
GPIO1
OB
OB
RSV
RSV
RW
00
RW
00
RW
00
RW
00
0
Msk_RTD Msk_RTD
2
1
Msk_Fan1
GPIO2 in GPIO1 in
GPIO2
out
RSV
PWM1_P
ol
RSV
GPIO1 out
EnDCFAN
1
PWM1_O
D
RSV
RSV
FANDuty1
RSV
RSV
TwoDimen
sion
RPM_HIG
H_EN
RSV
Temp2FanSelect
RSV
RSV
Temp2_Sh
are_En
Temp2_Share_Sel
RSV
RSV
RSV
Temp1FanSelect
Temp3FanSelect
Temp2_Sour_Sel
Temp1_S
hare_En
Temp3_S
hare_En
RSV
RSV
Temp1_Share_Sel
Temp3_Share_Sel
Temp1_Sour_Sel
Temp3_Sour_Sel
6A
Fan1_Target
R
6D
Close-Loop Fan
Control RPM mode
Tolerance
RW
00
6E
Fanctl Step Up Time
RW
0A
UpTime
6F Fanctl Step Down Time RW
0A
DownTime
70
RW
7F
DefaultFanSpeed
DefaultFanSpeed
2
RSV
53
5E
3
Fan1_Target[7:0]
RSV
Generic_Tol_RPM
71
PWM1 Prescalar
RW
FanOutDivi
84
sor1[7]
74
Temp1 Hysteresis
RW
53
RSV
Criti_HysT1
RSV
Oper_HysT1
75
Temp2 Hysteresis
RW
53
RSV
Criti_HysT2
RSV
Oper_HysT2
76
Temp3 Hysteresis
RW
53
RSV
Criti_HysT3
RSV
Oper_HysT3
77
Fanctl1 Start Duty
Cycle
RW
30
StartDutyCycle
78
Stop Time of Fanctl1
RW
FF
StopTime
RW
00
Temp1Table_TR1
RW
00
Temp1Table_TR2
RW
00
Temp1Table_TR3
RW
00
Temp1Table_TR4
80
81
82
83
Table 1 Transition
Point 1
Table 1 Transition
Point 2
Table 1 Transition
Point 3
Table 1 Transition
Point 4
FanOutDivisor1[6:0]
Confidential
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July, 2012
Version: 1.0
NCT7511Y
Idx
Register Name
Att
Df
84
Table 1 Critical Point
RW
00
Temp1Table_TRCritical
RW
00
Temp1Table_FL1
RW
00
Temp1Table_FL2
RW
00
Temp1Table_FL3
RW
00
Temp1Table_FL4
RW
00
Temp2Table_TR1
RW
00
Temp2Table_TR2
RW
00
Temp2Table_TR3
RW
00
Temp2Table_TR4
RW
00
Temp2Table_TRCritical
RW
00
Temp2Table_FL1
RW
00
Temp2Table_FL2
RW
00
Temp2Table_FL3
RW
00
Temp2Table_FL4
RW
00
Temp3Table_TR1
RW
00
Temp3Table_TR2
RW
00
Temp3Table_TR3
RW
00
Temp3Table_TR4
RW
00
Temp3Table_TRCritical
RW
00
Temp3Table_FL1
RW
00
Temp3Table_FL2
RW
00
Temp3Table_FL3
RW
00
Temp3Table_FL4
85
86
87
88
90
91
92
93
94
95
96
97
98
A0
A1
A2
A3
A4
A5
A6
A7
A8
Table 1 Y-axis
Transition Point 1
Table 1 Y-axis
Transition Point 2
Table 1 Y-axis
Transition Point 3
Table 1 Y-axis
Transition Point 4
Table 2 Transition
Point 1
Table 2 Transition
Point 2
Table 2 Transition
Point 3
Table 2 Transition
Point 4
Table 2 Critical Point
Table 2 Y-axis
Transition Point 1
Table 2 Y-axis
Transition Point 2
Table 2 Y-axis
Transition Point 3
Table 2 Y-axis
Transition Point 4
Table 3 Transition
Point 1
Table 3 Transition
Point 2
Table 3 Transition
Point 3
Table 3 Transition
Point 4
Table 3 Critical Point
Table 3 Y-axis
Transition Point 1
Table 3 Y-axis
Transition Point 2
Table 3 Y-axis
Transition Point 3
Table 3 Y-axis
Transition Point 4
7
6
5
4
3
2
C1
TD1 Offset
R/W
00
RSV
Offset_TD1
C2
TD2 Offset
R/W
00
RSV
Offset_TD2
FC
SOFT RESET
W
FD
Vendor ID
R
Vendor ID
FE
ChipID
R
ChipID
FF
Device ID
R
Version ID
INIT
1
0
RSV
Confidential
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July, 2012
Version: 1.0
NCT7511Y
7.2
REGISTER DETAIL
7.2.1
Remote Diode 1 Temperature Readout Register (MSB)
Location : Index 01h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
7.2.2
3
2
1
0
2
1
0
2
1
0
2
1
0
MNTRTD1[10:3]
NAME
FUNC.
4
MNTRTD1[10:3] : Readout of RTD1 MSB.
Remote Diode 2 Temperature Readout Register (MSB)
Location : Index 02h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
7.2.3
3
MNTRTD2[10:3]
NAME
FUNC.
4
MNTRTD2[10:3] : Readout of RTD2 MSB.
Local Diode Temperature Readout Register (MSB)
Location : Index 04h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
7.2.4
3
MNTLTD[10:3]
NAME
FUNC.
4
MNTLTD[10:3] : Readout of LTD MSB.
Temperature Readout Register (LSB)
Location : Index 05h
Type : Read Only
Power on default value : 00h
BIT
7
5
4
3
MNTTD_LSB[2:0]
NAME
FUNC.
6
RSV
MNTTD_LSB[2:0] : Readout of RTD and LTD LSB.
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July, 2012
Version: 1.0
NCT7511Y
7.2.5
Fan Count 1 Readout Register (MSB)
Location : Index 10h
Type : Read Only
Power on default value : 00h
BIT
7
6
5
4
7.2.6
2
1
0
2
1
0
MNTFAN1[12:5]
NAME
FUNC.
3
MNTFAN1[12:5] : Readout of Fan Count 1 MSB.
Fan Count Readout Register (LSB)
Location : Index 13h
Type : Read Only
Power on default value : 00h
BIT
7
6
7.2.7
4
3
RSV
MNTFAN_LSB[4:0]
NAME
FUNC.
5
MNTFAN_LSB[4:0] : Readout of Fan Count LSB.
T_CRIT#_SET Point Register
Location : Index 14h
Type : Read Only
Power on default value : refer to the section 5.12 T_CRIT#_SET
BIT
7
6
5
7.2.8
3
2
1
0
T_CRIT#_SET Point
NAME
FUNC.
4
T_CRIT#_SET Point : Temperature point of T_CRIT#_SET power on strapping.
Alert Status Register
Location : Index 16h
Type : Read Only
Power on default value :00h
BIT
7
6
RSV
NAME
5
4
3
2
1
0
T_CRIT#
GPIO
FAN
High
Low
Fault
T_CRIT# : 1 indicates the T_CRIT# event asserts.
GPIO : 1 indicates the GPIO event asserts.
FUNC.
FAN : 1 indicates the Fan event asserts, corresponds to Index[1Ah].
High : 1 indicates the High event asserts, corresponds to Inex[19h]
Low : 1 indicates the Low event asserts, corresponds to Index[18h].
Fault : 1 indicates the Fault event asserts, corresponds to Index[17h].
Confidential
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July, 2012
Version: 1.0
NCT7511Y
7.2.9
Diode Fault Alert Status Register
Location : Index 17h
Type : Read Only
Power on default value :00h
BIT
7
6
5
3
2
RSV
NAME
FUNC.
4
1
0
STS_DF2
STS_DF1
STS_DF2 : 1 indicates the TD2 fault.
STS_DF1 : 1 indicates the TD1 fault.
7.2.10 Low Alert Status Register
Location : Index 18h
Type : Read Only
Power on default value :00h
BIT
7
6
5
4
RSV
NAME
3
2
1
0
STS_AL4
RSV
STS_AL2
STS_AL1
3
2
1
0
STS_AH
4
RSV
STS_AH
2
STS_AH
1
2
1
0
STS_AL4 : 1 indicates the LTD over low limit.
FUNC.
STS_AL2 : 1 indicates the RTD2 over low limit.
STS_AL1 : 1 indicates the RTD1 over low limit.
7.2.11 High Alert Status Register
Location : Index 19h
Type : Read Only
Power on default value :00h
BIT
7
6
5
4
RSV
NAME
STS_AH4 : 1 indicates the LTD over high limit.
FUNC.
STS_AH2 : 1 indicates the RTD2 over high limit.
STS_AH1 : 1 indicates the RTD1 over high limit.
7.2.12 Fan Alert Status Register
Location : Index 1Ah
Type : Read Only
Power on default value :00h
BIT
7
RSV
NAME
FUNC.
6
5
4
3
FAN_TA
R1
RSV
FAN_FC
1
FAN_TAR3 : 1 indicates the FAN1 is driven to fully speed over 3 minutes.
FAN_FC1 : 1 indicates the FAN1 over limit.
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July, 2012
Version: 1.0
NCT7511Y
7.2.13 T_CRIT# Alert Status Register
Location : Index 1Bh
Type : Read Only
Power on default value :00h
BIT
7
6
5
4
RSV
NAME
3
2
1
0
STS_TC4
RSV
STS_TC2
STS_TC1
2
1
0
STS_GPI
O2
STS_GPI
O1
STS_TC4 : 1 indicates the LTD T_CRIT# asserts.
FUNC.
STS_TC2 : 1 indicates the RTD2 T_CRIT# asserts.
STS_TC1 : 1 indicates the RTD1 T_CRIT# asserts.
7.2.14 GPIO Alert Status Register
Location : Index 1Ch
Type : Read Only
Power on default value :00h
BIT
7
6
5
3
RSV
NAME
FUNC.
4
STS_GPIO2 : 1 indicates the GPIO2 event asserts.
STS_GPIO1 : 1 indicates the GPIO1 event asserts.
7.2.15 T_CRIT# Real Time Status Register
Location : Index 20h
Type : Read Only
Power on default value :00h
BIT
7
6
5
4
RSV
NAME
3
2
1
0
LTD_Tex
c
RSV
RTD2_Te
xc
RTD1_Te
xc
1
0
LTD_Texc : 1 indicates the LTD over the shutdown threshold.
FUNC.
RTD2_Texc : 1 indicates the RTD2 over the shutdown threshold.
RTD1_Texc : 1 indicates the RTD1 over the shutdown threshold.
7.2.16 Start Register
Location : Index 21h
Type : Read/Write
Power on default value : 01h
BIT
7
NAME
MSK_AL
ERT
FUNC.
6
5
4
3
RSV
2
START
MSK_ALERT : 1 indicates the ALERT# output is masked.
START : 1 indicates the ADC is operating.
Confidential
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July, 2012
Version: 1.0
NCT7511Y
7.2.17 Mode Selection Register
Location : Index 22h
Type : Read/Write
Power on default value : 55h
BIT
7
6
NAME
RSV
EnLTD
5
4
3
RSV
2
1
RTD2_MD
0
RTD1_MD
EnLTD : 1 indicates the LTD function enabled.
FUNC.
RTD2_MD : 00=Closed , 01=Current mode , 10=RSV , 11=RSV
RTD1_MD : 00=Closed , 01=Current mode , 10=RSV , 11=RSV
7.2.18 Fan Enable Register
Location : Index 24h
Type : Read/Write
Power on default value : 01h
BIT
7
6
5
4
NAME
FUNC.
3
2
1
RSV
0
EnFan1
EnFan1 : 1 indicates the FANIN1 enabled.
7.2.19 Conversion Rate Register
Location : Index 26h
Type : Read/Write
Power on default value : 02h
BIT
7
6
5
3
2
RSV
NAME
FUNC.
4
1
0
ConvRate[1:0]
ConvRate[1:0] : 00=1Hz , 01=2Hz , 10= 4Hz , 11=Free Run.
7.2.20 Fault Queue Register
Location : Index 27h
Type : Read/Write
Power on default value : 03h
BIT
7
5
4
3
RSV
NAME
FUNC.
6
2
1
0
FaultQueue[1:0]
FaultQueue[1:0] : Fault Queue of Thermal Shutdown , 00=1 , 01=2 , 10=3 , 11=4 .
Confidential
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July, 2012
Version: 1.0
NCT7511Y
7.2.21 Alert# High Limit Link to T_CRIT#
Location : Index 28h
Type : Read/Write
Power on default value : 00h
BIT
7
6
NAME
5
4
3
RSV
2
1
0
SYS3
SYS2
SYS1
SYS3 : 1 indicates the External Diode3 channel high limit will be linked to T_CRIT#
FUNC.
SYS2 : 1 indicates the External Diode2 channel high limit will be linked to T_CRIT#
SYS1 : 1 indicates the External Diode1 channel high limit will be linked to T_CRIT#
7.2.22 RTD1 Temperature High Limit Register
Location : Index 30h
Type : Read/Write
Power on default value : 55h
BIT
7
6
5
4
2
1
0
1
0
1
0
RTD1_HL
NAME
FUNC.
3
RTD1_HL : RTD1 Temperature High Limit setting for ALERT# .
7.2.23 RTD1 Temperature Low Limit Register
Location : Index 31h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
2
RTD1_LL
NAME
FUNC.
3
RTD1_LL : RTD1 Temperature Low Limit setting for ALERT#.
7.2.24 RTD2 Temperature High Limit Register
Location : Index 32h
Type : Read/Write
Power on default value : 55h
BIT
7
5
4
3
2
RTD2_HL
NAME
FUNC.
6
RTD2_HL : RTD2 Temperature High Limit setting for ALERT#.
Confidential
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July, 2012
Version: 1.0
NCT7511Y
7.2.25 RTD2 Temperature Low Limit Register
Location : Index 33h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
2
1
0
2
1
0
2
1
0
2
1
0
RTD2_LL
NAME
FUNC.
3
RTD2_LL : RTD2 Temperature Low Limit setting for ALERT#.
7.2.26 LTD Temperature High Limit Register
Location : Index 36h
Type : Read/Write
Power on default value : 55h
BIT
7
6
5
4
LTD_HL
NAME
FUNC.
3
LTD_HL : LTD Temperature High Limit setting for ALERT#.
7.2.27 LTD Temperature Low Limit Register
Location : Index 37h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
LTD_LL
NAME
FUNC.
3
LTD_LL : LTD Temperature Low Limit setting for ALERT#.
7.2.28 RTD1 T_CRIT# Threshold Register
Location : Index 3Ah
Type : Read/Write
Power on default value : 64h
BIT
7
5
4
3
TCRIT_RTD1
NAME
FUNC.
6
TCRIT_RTD1 : RTD1 Temperature Threshold of T_CRIT#.
Confidential
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Version: 1.0
NCT7511Y
7.2.29 RTD2 T_CRIT# Threshold Register
Location : Index 3Bh
Type : Read/Write
Power on default value : 64h
BIT
7
6
5
4
2
1
0
2
1
0
2
1
0
2
1
0
TCRIT_RTD2
NAME
FUNC.
3
TCRIT_RTD2 : RTD2 Temperature Threshold of T_CRIT#.
7.2.30 LTD T_CRIT# Threshold Register
Location : Index 3Dh
Type : Read/Write
Power on default value : 64h
BIT
7
6
5
4
TCRIT_LTD
NAME
FUNC.
3
TCRIT_LTD : LTD Temperature Threshold of T_CRIT#.
7.2.31 FANIN1 Limit Low Byte Register
Location : Index 49h
Type : Read/Write
Power on default value : FFh
BIT
7
6
5
3
FANIN1_HL[7:0]
NAME
FUNC.
4
FANIN1_HL[7:0] : FANIN1 Limit Low Byte.
7.2.32 FANIN1 Limit High Byte Register
Location : Index 4Ch
Type : Read/Write
Power on default value : F8h
BIT
7
5
4
3
FANIN1_HL[12:8]
NAME
FUNC.
6
RSV
FANIN1_HL[12:8] : FANIN1 Limit High Byte.
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Version: 1.0
NCT7511Y
7.2.33 ALERT Mask Register Register
Location : Index 4Fh
Type : Read/Write
Power on default value : 7Fh
BIT
7
6
5
4
3
2
1
0
NAME
RSV
MSK_TC
MSK_GP
IO
MSK_TA
RT
MSK_FC
MSK_AH
MSK_AL
MSK_DF
MSK_TC : 1 indicates the ALERT# from T_CRIT# event will be masked .
MSK_GPIO : 1 indicates the ALERT# from GPIO event will be masked .
MSK_TART : 1 indicates the ALERT# from TART event will be masked .
FUNC.
MSK_FC : 1 indicates the ALERT# from FAN event will be masked .
MSK_AH : 1 indicates the ALERT# from High ALERT event will be masked .
MSK_AL : 1 indicates the ALERT# from Low ALERT event will be masked .
MSK_DF : 1 indicates the ALERT# from Diode Fault event will be masked .
7.2.34 ALERT Mask Temperature Channel Register
Location : Index 50h
Type : Read/Write
Power on default value : 3Fh
BIT
7
6
5
4
RSV
NAME
3
2
1
0
MSK_LT
D
RSV
MSK_RT
D2
MSK_RT
D1
MSK_LTD : 1 indicates the ALERT# from LTD event will be masked .
FUNC.
MSK_RTD2 : 1 indicates the ALERT# from RTD2 event will be masked .
MSK_RTD1 : 1 indicates the ALERT# from RTD1 event will be masked .
7.2.35 ALERT Mask Fan Channel Register
Location : Index 51h
Type : Read/Write
Power on default value : 07h
BIT
7
5
4
3
2
1
RSV
NAME
FUNC.
6
0
MSK_FA
N1
MSK_FAN1 : 1 indicates the ALERT# from FAN1 event will be masked .
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Version: 1.0
NCT7511Y
7.2.36 T_CRIT# Mask Register
Location : Index 53h
Type : Read/Write
Power on default value : BFh
BIT
7
NAME
MSK_ALL
6
5
4
RSV
3
2
1
0
MSK_LT
D4
RSV
MSK_RT
D2
MSK_RT
D1
MSK_ALL : 1 indicates the T_CRIT# from ALL event will be masked .
FUNC.
MSK_LTD : 1 indicates the T_CRIT# from LTD event will be masked .
MSK_RTD2 : 1 indicates the T_CRIT# from RTD2 event will be masked .
MSK_RTD1 : 1 indicates the T_CRIT# from RTD1 event will be masked .
7.2.37 GPIO Alert Mask Register
Location : Index 54h
Type : Read/Write
Power on default value : 3Fh
BIT
7
6
5
NAME
FUNC.
4
3
2
RSV
1
0
MSK_GP
IO2
MSK_GP
IO1
MSK_GPIO2 : 1 indicates the ALERT# from GPIO2 event will be masked .
MSK_GPIO1 : 1 indicates the ALERT# from GPIO1 event will be masked .
7.2.38 GPIO Mode Register
Location : Index 56h
Type : Read/Write
Power on default value : 3Fh
BIT
7
NAME
FUNC.
6
5
4
3
RSV
2
1
0
GPIO2
Mode
GPIO1
Mode
GPIO2 Mode : 0= Input , 1= Output.
GPIO1 Mode : 0= Input , 1= Output.
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Version: 1.0
NCT7511Y
7.2.39 GPIO Output Type Register
Location : Index 57h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
3
2
RSV
NAME
FUNC.
4
1
0
GPIO2
OB
GPIO1
OB
1
0
GPIO2 IN
GPIO1 IN
1
0
GPIO2
OUT
GPIO1
OUT
1
0
GPIO2 Output Type : 0= Push Pull , 1= Open Drain.
GPIO1 Output Type : 0= Push Pull , 1= Open Drain.
7.2.40 GPIO Input Data Register
Location : Index 58h
Type : Read Only
Power on default value :00h
BIT
7
6
5
3
2
RSV
NAME
FUNC.
4
GPIO2 IN : Input data register of GPIO2.
GPIO1 IN : Input data register of GPIO1.
7.2.41 GPIO Output Data Register
Location : Index 59h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
NAME
FUNC.
4
3
2
RSV
GPIO2 OUT : Output data register of GPIO2.
GPIO1 OUT : Output data register of GPIO1.
7.2.42 Fan Control Output Type Register
Location : Index 5Eh
Type : Read/Write
Power on default value : 00h
BIT
7
5
4
3
RSV
NAME
FUNC.
6
2
EnDCFA
N1
EnDCFAN1 : 0 indicates the FANCTL1 output is PWM type.
1 indicates the FANCTL1 output is DC type.
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7.2.43 Fan Control Output Mode Register
Location : Index 5Fh
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
RSV
NAME
4
3
PWM1_P
OL
2
1
0
PWM1_O
D
RSV
PWM1_POL : 1 indicates the FANCTL1 PWM output is inverted.
FUNC.
PWM1_OD : 0 indicates the FANCTL1 PWM output is push pull.
1 indicates the FANCTL1 PWM output is open drain.
7.2.44 Fan Control 1 Output Value Register
Location : Index 60h
Type : Read/Write for Manual mode , Read only for Smart Fan control
Power on default value :7Fh
BIT
7
6
5
4
2
1
0
3
2
1
0
FANDuty1
NAME
FUNC.
3
FANDuty1 : FANCTL1 output value.
7.2.45 Close-Loop Fan Control RPM mode Register
Location : Index 63h
Type : Read/Write
Power on default value : 00h
BIT
7
5
4
TwoDim
ension
RSV
NAME
FUNC.
6
RPM_HI
GH_EN
RSV
RSV
TwoDimension : Close_Loop Fan Control Enable
Bit5 : 1 indicated the FAN1 group enables Close-Loop Fan Control RPM mode
RPM_HIGH_EN : Changing default unit of all RPM setting from 50 RPMs to 100 RPMs.
It benefits to control ultra high RPM fan
Bit2 : 1 indicated the FAN1 group support ultra high RPM fan
7.2.46 Temperature to Fan mapping Relationships Register
Location : Index 64h
Type : Read/Write
Power on default value : 00h
BIT
7
NAME
RSV
FUNC.
6
5
4
3
Temp2FanSelect
RSV
2
1
0
Temp1FanSelect
Temp2FanSelect ,
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NCT7511Y
Temp1FanSelect :
Enable FANCTL3 – FANCTL1 Smart Fan.
0 = FANCTL has no relation with this temperature source. FANCTL is controlled by
Manual mode. (Default)
TM
1 = Applies SmartFan control for SMART FAN
IV on FANCTL and this temperature.
7.2.47 Temperature to Fan mapping Relationships Register
Location : Index 65h
Type : Read/Write
Power on default value : 00h
BIT
7
6
NAME
4
3
2
1
RSV
Temp3FanSelect :
FUNC.
5
0
Temp3FanSelect
Enable FANCTL3 – FANCTL1 Smart Fan.
0 = FANCTL has no relation with this temperature source. FANCTL is controlled by
Manual mode. (Default)
TM
1 = Applies SmartFan control for SMART FAN
IV on FANCTL and this temperature.
7.2.48 Fan Control Configuration Register 1
Location : Index 66h
Type : Read/Write
Power on default value : 00h
BIT
7
6
NAME
Temp2_Sh
are_En
5
4
3
2
Temp1_
Share_E
n
Temp2_Share_Sel
1
0
Temp1_Share_Sel
Temp2_Share_En : Enable temperature2 sharing table function.
Temp2_Share_Sel : Select which temperature2 source could share control table in
TM
SMART FAN IV
FUNC.
Temp1_Share_En : Enable temperature1 sharing table function.
Temp1_Share_Sel : Select which temperature1 source could share control table in
TM
SMART FAN IV
Refer to the Sharing Table.
Sharing Table.
BIT [2-0]
Share_Sel Condition
000BIN
Mapping to Remote 1 temperature.
001BIN
Mapping to Remote 2 temperature.
011BIN
Mapping to Local temperature.
110BIN
Mapping to Programmable temperature 1.
111BIN
Mapping to Programmable temperature 2.
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NCT7511Y
7.2.49 Fan Control Configuration Register 2
Location : Index 67h
Type : Read/Write
Power on default value : 00h
BIT
7
6
5
4
3
RSV
NAME
2
Temp3_
Share_E
n
1
0
Temp3_Share_Sel
Temp3_Share_En : Enable temperature3 sharing table function.
FUNC.
Temp3_Share_Sel : Select which temperature3 source could share control table in
TM
SMART FAN IV
Refer to the Sharing Table.
7.2.50 Fan Control Configuration Register 3
Location : Index 68h
Type : Read/Write
Power on default value : 00h
BIT
7
NAME
RSV
6
5
4
3
Temp2_Source_Sel
2
RSV
1
0
Temp1_Source_Sel
Temp2_Source_Sel : Temperature 2 source selection.
FUNC.
Temp1_Source_Sel : Temperature 1 source selection.
Refer to the Sharing Table.
7.2.51 Fan Control Configuration Register 4
Location : Index 69h
Type : Read/Write
Power on default value : 00h
BIT
7
6
NAME
FUNC.
5
4
3
2
RSV
1
0
Temp3_Source_Sel
Temp3_Source_Sel : Temperature 3 source selection.
Refer to the Sharing Table.
7.2.52 Fan 1 Target Register
Location : Index 6Ah
Type : Read only
Power on default value : 8Ch
BIT
7
5
4
3
2
1
0
Fan1_Target
NAME
FUNC.
6
Fan1_Target : RPM mode FANCTL1 Target Register
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NCT7511Y
7.2.53 Close-Loop Fan Control RPM Mode Tolerance Register
Location : Index 6Dh
Type : Read/Write
Power on default value : 0Ah
BIT
7
6
NAME
FUNC.
5
4
3
2
RSV
1
0
Generic_Tol_RPM
Generic_Tol_RPM : Tolerance of RPM mode, unit 50 RPM.
7.2.54 FANCTL Step Up Time Register
Location : Index 6Eh
Type : Read/Write
Power on default value : 0Ah
BIT
7
6
5
4
NAME
3
2
1
0
UpTime
TM
FUNC.
UpTime : In SMART FAN IV mode, this register determines the amount of time
FANOUT takes to increase its value by one step.
The units are intervals of 0.1 second. The default time is 1 second.
7.2.55 FANCTL Step Down Time Register
Location : Index 6Fh
Type : Read/Write
Power on default value : 0Ah
BIT
7
6
5
4
3
2
1
0
DownTime
NAME
TM
FUNC.
DownTime : In SMART FAN IV mode, this register determines the amount of time
FANOUT takes to decrease its value by one step.
The units are intervals of 0.1 second. The default time is 1 second.
7.2.56 Default Fan Speed Register
Location : Index 70h
Type : Read/Write
Power on default value : 7Fh
BIT
7
5
4
3
2
1
0
DefaultFanSpeed
NAME
FUNC.
6
DefaultFanSpeed : (Default Fan Speed at Power-on). Specifies the fan duty at next
power on.
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NCT7511Y
7.2.57 FANCTL1 PWM Prescalar Register
Location : Index 71h
Type : Read/Write
Power on default value : 84h
BIT
7
6
NAME
CLKSEL
5
4
3
2
1
0
Divisor[6:0]
CLKSEL : Clock source select.
FUNC.
Divisor : Clock frequency Divisor.
Refer the Divisor table.
The clock source selected by CLKSEL will be divided by the divisor and used as a fan PWM output
frequency.
If CLKSEL equals 1, then the output clock is simply equal to 125/ (Divisor[6:0]+1) KHz
MappedDivisor depends on Divisor[6:0] and is described in the table below.
Divisor[6:0]
Mapped
Divisor
Output
Frequency
Divisor[6:0]
Mapped
Divisor
Output
Frequency
0000000
1
125KHz
0000001
2
62.5KHz
0000010
3
41.6KHz
0000011
4
31.2KHz
0000100
5
25KHz
0001111
16
7.8KHz
0000101
6
20.8KHz
0011111
32
3.9KHz
0000110
7
17.8KHz
0111111
64
1.9KHz
0000111
8
15.6KHz
1111111
128
976Hz
…………………………………………..
If CLKSEL equals 0, then the output clock is simply equal to 1000/ Mapped Divisor Hz
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
1000Hz
1000
12
83Hz
0001
2
500Hz
1001
16
62.5Hz
0010
3
333Hz
1010
32
31.25Hz
0011
4
250Hz
1011
64
15.6Hz
0100
5
200Hz
1100
128
7.8Hz
0101
6
166Hz
1101
256
3.9Hz
0110
7
142Hz
1110
512
1.9Hz
0111
8
125Hz
1111
1024
0.97Hz
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NCT7511Y
7.2.58 Temperature1 Hysteresis Register
Location : Index 74h
Type : Read/Write
Power on default value : 53h
BIT
7
NAME
RSV
FUNC.
6
5
4
3
Criti_HysT1
2
RSV
Criti_HysT1 : Hysteresis value of SMART FAN
TM
Oper_HysT1 : Hysteresis value of SMART FAN
1
0
Oper_HysT1
IV Critical Temperature
TM
IV Operating Temperature
7.2.59 Temperature 2 Hysteresis Register
Location : Index 75h
Type : Read/Write
Power on default value : 53h
BIT
7
NAME
RSV
FUNC.
6
5
4
3
Criti_HysT2
2
RSV
Criti_HysT2 : Hysteresis value of SMART FAN
TM
Oper_HysT2 : Hysteresis value of SMART FAN
1
0
Oper_HysT2
IV Critical Temperature
TM
IV Operating Temperature
7.2.60 Temperature 3 Hysteresis Register
Location : Index 76h
Type : Read/Write
Power on default value : 53h
BIT
7
NAME
RSV
FUNC.
6
5
4
3
Criti_HysT3
2
RSV
Criti_HysT3 : Hysteresis value of SMART FAN
TM
Oper_HysT3 : Hysteresis value of SMART FAN
1
0
Oper_HysT3
IV Critical Temperature
TM
IV Operating Temperature
7.2.61 FANCTL Start Duty Cycle Register
Location : Index 77h
Type : Read/Write
Power on default value :30h
BIT
7
NAME
FUNC.
6
5
4
3
2
1
0
StartDutyCycle
StartDutyCycle : control the FANCTL1-FANCTL3 fan output start-up value.
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NCT7511Y
7.2.62 FANCTL Stop Time Register
Location : Index 78h
Type : Read/Write
Power on default value : FFh
BIT
7
6
5
NAME
4
3
2
1
0
StopTime
StopTime : control the FANCTL1-FANCTL3 fan stop time.
FUNC.
Unit in 0.1sec. Ranges from 0.1sec to 25.5sec.
If set to 0, the fan will never stop.
7.2.63 SMART FANTM IV Temperature and PWM Registers Register
Location : Table 1 Address 80h ~ 88h
Location : Table 2 Address 90h ~ 98h
Location : Table 3 Address A0h ~ A8h
Type : Read/Write
Power on default value: refer to below tables
TABLE
Table1
Table2
Table3
NAME
ADDRESS
DEFAULT
TYPE
Transition Point : T1
80HEX
19 HEX
Read/Write
Transition Point : T2
81HEX
23 HEX
Read/Write
Transition Point : T3
82HEX
23 HEX
Read/Write
Transition Point : T4
83HEX
37 HEX
Read/Write
Critical Point
84HEX
3C HEX
Read/Write
Y-axis Transition Point : PWM1
85HEX
8C HEX
Read/Write
Y-axis Transition Point : PWM2
86HEX
8C HEX
Read/Write
Y-axis Transition Point : PWM3
87HEX
C8 HEX
Read/Write
Y-axis Transition Point : PWM4
88HEX
E6 HEX
Read/Write
Transition Point : T1
90HEX
19 HEX
Read/Write
Transition Point : T2
91HEX
23 HEX
Read/Write
Transition Point : T3
92HEX
23 HEX
Read/Write
Transition Point : T4
93HEX
37 HEX
Read/Write
Critical Point
94HEX
3C HEX
Read/Write
Y-axis Transition Point : PWM1
95HEX
8C HEX
Read/Write
Y-axis Transition Point : PWM2
96HEX
8C HEX
Read/Write
Y-axis Transition Point : PWM3
97HEX
C8 HEX
Read/Write
Y-axis Transition Point : PWM4
Transition Point : T1
98HEX
E6 HEX
Read/Write
A0HEX
19 HEX
Read/Write
Transition Point : T2
A1HEX
23 HEX
Read/Write
Transition Point : T3
A2HEX
23 HEX
Read/Write
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NCT7511Y
TABLE
NAME
ADDRESS
DEFAULT
TYPE
Transition Point : T4
A3HEX
37 HEX
Read/Write
Critical Point
A4HEX
3C HEX
Read/Write
Y-axis Transition Point : PWM1
A5HEX
8C HEX
Read/Write
Y-axis Transition Point : PWM2
A6HEX
8C HEX
Read/Write
Y-axis Transition Point : PWM3
A7HEX
C8 HEX
Read/Write
Y-axis Transition Point : PWM4
A8HEX
E6 HEX
Read/Write
7.2.64 TD1 Offset Register
Location : Index C1h
Type : Read/Write
Power on default value : 00h
BIT
7
5
4
3
RSV
NAME
FUNC.
6
2
1
0
1
0
2
1
0
2
1
0
Offset_TD1
Offset_TD1 : TD1 function offset register .
7.2.65 TD2 Offset Register
Location : Index C2h
Type : Read/Write
Power on default value : 00h
BIT
7
5
4
3
RSV
NAME
FUNC.
6
2
Offset_TD2
Offset_TD2 : TD2 function offset register .
7.2.66 Soft Reset Register
Location : Index FCh
Type : Write Only
Power on default value : FFh
BIT
7
NAME
INIT
FUNC.
6
5
4
3
RSV
INIT : Write 1 to reset the NCT7511Y.
7.2.67 Vendor ID Register
Location : Index FDh
Type : Ready Only
Power on default value : 50h
BIT
7
6
5
4
3
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NCT7511Y
Vendor ID
NAME
FUNC.
Vendor ID of NCT7511Y is 50h
7.2.68 Chip ID Register
Location : Index FEh
Type : Ready Only
Power on default value : C3h
BIT
7
6
5
4
2
1
0
3
2
1
0
Chip ID
NAME
FUNC.
3
Chip ID of NCT7511Y is C3h
7.2.69 Device ID Register
Location : Index FFh
Type : Ready Only
Power on default value : 2xh
BIT
7
5
4
Device ID
NAME
FUNC.
6
Device ID of NCT7511Y is 2xh (x=0,1,2…)
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NCT7511Y
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 +85
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
V
IOL = 12 mA
V
IOL = 12 mA
V
IOH = -12 mA
V
VDD = 3.3V
V
VDD = 3.3V
OD12 – Open-drain output pin with source-sink capability of 12 mA
Output Low Voltage
VOL
0.4
OUT12 - Output buffer pin with source-sink capability of 12 mA
Output Low Voltage
VOL
Output High Voltage
VOH
INts -
0.4
2.4
TTL level Schmitt-triggered input pin
Input Low Voltage
VIL
0.8
Input High Voltage
VIH
Input High Leakage
ILIH
+10
A
VIN=3.3V
Input Low Leakage
ILIL
-10
A
VIN=0V
2.0
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NCT7511Y
8.3
AC Characteristics
SMBus Interface
PARAMETER
SCL clock period
SYMBOL
-
MIN.
MAX.
UNIT
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
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NCT7511Y
9. ORDERING INFORMATION
PART NUMBER
PACKAGE
NCT7511Y
QFN16
SUPPLIED AS
E shape: Tray
T shape: 4,000 units/T&R
PRODUCTION FLOW
Commercial, 0°C to +70°C
10. TOP MARKING SPECIFICATION
NCT7511Y
113TABA
st
1 Line : Nuvoton Logo
nd
2 Line : Part number- NCT7511Y
rd
3 Line : Assembly tracking code
1 13: packages made in year 2011, week 13
T : Assembly house code
A : IC version
BA : Nuvoton internal use code
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NCT7511Y
11. TAPING SPECIFICATION
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NCT7511Y
12. PACKAGE DRAWING AND DIMENSIONS
QFN16 4x4 MM2
SEATING PLANE
2
2
y
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NCT7511Y
13. REVISION HISTORY
VERSION
DATE
PAGE
0.1
05/2010
N.A.
0.3
07/2010
Add register definition and feature description
0.31
08/2010
Add Package information
0.32
12/2010
Add more feature description
0.33
01/2011
Modify the description and correct the typo
0.4
05/2011
Remote EEPROM function, and modify the
description and correct the typo
0.5
01/2012
Add RPM mode
1.0
07/2012
38
DESCRIPTION
Preliminary version.
Add taping spec
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.
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Version: 1.0
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