ADT7476
PIN ASSIGNMENT
Pin No.
Mnemonic
SDA
Description
1
2
3
4
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus pullup.
Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pullup.
Ground Pin.
SCL
GND
VCC
Power Supply. Powered by 3.3 V standby, if monitoring in low power states is required. VCC is also
monitored through this pin.
5
6
7
8
VID0/
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
GPIO0
General−Purpose Open Drain Digital I/O.
VID1/
GPIO1
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
General−Purpose Open Drain Digital I/O.
VID2/
GPIO2
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
General−Purpose Open Drain Digital I/O.
VID3/
GPIO3
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
General−Purpose Open Drain Digital I/O.
9
TACH3
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3.
10
PWM2/
SMBALERT
Digital Output (Open Drain). Requires 10 kW typical pullup. Pulse width modulated output to control Fan 2
speed. Can be configured as a high or low frequency drive. Digital Output (Open Drain). This pin can be
reconfigured as an SMBALERT interrupt output to signal out−of−limit conditions.
11
12
13
TACH1
TACH2
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2.
PWM3
ADDREN
Digital I/O (Open Drain). Pulse width modulated output to control the speed of Fan 3 and Fan 4. Requires
10 kW typical pullup. Can be configured as a high or low frequency drive.
If pulled low on powerup, the ADT7476 enters address select mode, and the state of Pin 14 (ADDR SELECT)
determines the ADT7476’s slave address.
14
TACH4/
THERM/
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4.
Alternatively, the pin can be reconfigured as a bidirectional THERM pin. Times and monitors assertions on
the THERM input. For example, it can be connected to the PROCHOT output of Intel’s Pentium 4
processor or to the output of a trip point temperature sensor. Can be used as an output to signal
overtemperature conditions.
Digital Output (Open Drain). This pin can be reconfigured as an SMBALERT interrupt output to signal
out−of−limit conditions.
SMBALERT/
GPIO6/
ADDR SELECT
General−Purpose Open Drain Digital I/O.
If in address select mode, the logic state of this pin defines the SMBus device address.
15
16
17
18
19
D2–
D2+
D1–
D1+
Cathode Connection to Second Thermal Diode.
Anode Connection to Second Thermal Diode.
Cathode Connection to First Thermal Diode.
Anode Connection to First Thermal Diode.
VID4/
GPIO4
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
General−Purpose Open Drain Digital I/O.
20
21
+5.0 V
Analog Input. Monitors 5.0 V power supply.
IN
+12 V
/
Analog Input. Monitors 12 V power supply.
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
IN
VID5
22
+2.5 V
/
Analog Input. Monitors 2.5 V supply, typically a chipset voltage.
IN
THERM
Alternatively, this pin can be reconfigured as a bidirectional/omnidirectional THERM pin. Can be used to
time and monitor assertions on the THERM input. For example, can be connected to the PROCHOT
output of Intel’s Pentium 4 processor or to the output of a trip point temperature sensor. Can be used as
an output to signal overtemperature conditions.
23
24
V
Analog Input. Monitors processor core voltage (0 V to 3.0 V).
CCP
PWM1/
XTO
Digital Output (Open Drain). Pulse width modulated output to control the speed of Fan 1. Requires 10 kW
typical pullup.
Also functions as the output from the XOR tree in XOR test mode.
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