ADT7463 datasheet(5/52 Pages) AD

Part #	ADT7463

Description	dB COOL Remote Thermal Controller and Voltage Monitor

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ADT7463

–5–

PIN FUNCTION DESCRIPTIONS

Pin No. Mnemonic

Description

1

SDA

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

2

SCL

Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull-up.

3

GND

Ground Pin for the ADT7463.

4

VCC

Power Supply. Can be powered by 3.3 V standby if monitoring in low power states is required. VCC is also

monitored through this pin. The ADT7463 can also be powered from a 5 V supply. Setting Bit 7 of

Configuration Register 1 (Reg. 0x40) rescales the VCC input attenuators to correctly measure a 5 V supply.

5VID0Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).

6VID1Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).

7VID2Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).

8VID3Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read in to the VID register (Reg. 0x43).

9

TACH3

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan3. Can be reconfigured as an analog in-

put (AIN3) to measure the speed of 2-wire fans.

10

PWM2

Digital Output (Open Drain). Requires 10 k

Ω typical pull-up. Pulsewidth modulated output to control FAN 2 speed.

SMBALERT

Digital Output (Open Drain). This pin may 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. Can be reconfigured as an analog in-

put (AIN1) to measure the speed of 2-wire fans.

12

TACH2

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2. Can be reconfigured as an analog in-

put (AIN2) to measure the speed of 2-wire fans.

13

PWM3

Digital I/O (Open Drain). Pulsewidth modulated output to control Fan 3/4 speed. Requires 10 k

Ω typical pull-up.

ADDRESS

ENABLE

If pulled low on power-up, this places the ADT7463 into Address Select mode, and the state of Pin 14 will

determine the ADT7463’s slave address.

14

TACH4

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4. Can be reconfigured as an analog in-

put (AIN4) to measure the speed of 2-wire fans.

ADDRESS

SELECT

If in Address Select mode, this pin determines the SMBus device address.

THERM

Alternatively, the pin may be reconfigured as a bidirectional

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.

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

Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register

(Reg. 0x43).

20

+5VIN

Analog Input. Monitors +5 V power supply.

THERM

Alternatively, this pin may be reconfigured as a bidirectional

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.

21

+12VIN

Analog Input. Monitors +12 V power supply.

VID5

Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register

(Reg. 0x43). Supports VRM10 solutions.

22

+2.5VIN

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

SMBALERT

Digital Output (Open Drain). This pin may be reconfigured as an

SMBALERT interrupt output to signal

out-of-limit conditions.

23

VCCP

Analog Input. Monitors processor core voltage (0 V–3 V).

24

PWM1/XTO

Digital Output (Open Drain). Pulsewidth modulated output to control Fan 1 speed. Requires 10 k

Ω typical pull-up.

Also functions as the output from the XOR tree in XOR Test Mode.

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