ADT7476ARQH datasheet(6/67 Pages) ONSEMI

Part #	ADT7476ARQH

Description	dBCOOL Remote Thermal Controller and Voltage Monitor

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Manufacturer	ONSEMI [ON Semiconductor]

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ADT7476

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6

PIN ASSIGNMENT

Pin No.

Mnemonic

Description

1

SDA

Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus pullup.

2

SCL

Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pullup.

3

GND

Ground Pin.

4

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

VID0/

GPIO0

Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).

General−Purpose Open Drain Digital I/O.

6

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.

7

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.

8

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

TACH1

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1.

12

TACH2

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2.

13

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/

SMBALERT/

GPIO6/

ADDR SELECT

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.

General−Purpose Open Drain Digital I/O.

If in address select mode, the logic state of this pin defines the SMBus device address.

15

D2–

Cathode Connection to Second Thermal Diode.

16

D2+

Anode Connection to Second Thermal Diode.

17

D1–

Cathode Connection to First Thermal Diode.

18

D1+

Anode Connection to First Thermal Diode.

19

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

+5.0 VIN

Analog Input. Monitors 5.0 V power supply.

21

+12 VIN/

VID5

Analog Input. Monitors 12 V power supply.

Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).

22

+2.5 VIN/

THERM

Analog Input. Monitors 2.5 V supply, typically a chipset voltage.

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

VCCP

Analog Input. Monitors processor core voltage (0 V to 3.0 V).

24

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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