ADT7463ARQZ-R7 datasheet(5/52 Pages) ONSEMI

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REV. C

ADT7463

–5–

PIN FUNCTION DESCRIPTIONS

Pin No.

Mnemonic

Description

SDA

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

SCL

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

GND

Ground Pin for the ADT7463.

4VCC

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 Configura-

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

VID0

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

VID1

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

VID2

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

VID3

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

TACH3

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3. Can be reconfigured as an analog

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

PWM2

Digital Output (Open Drain). Requires 10 k

Ω typical pull-up. Pulse-width 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.

TACH1

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1. Can be reconfigured as an analog

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

TACH2

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

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

PWM3

Digital I/O (Open Drain). Pulse-width modulated output to control Fan 3/Fan 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.

TACH4

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

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

ADDRESS

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

SELECT

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.

D2–

Cathode Connection to Second Thermal Diode.

D2+

Anode Connection to Second Thermal Diode.

D1–

Cathode Connection to First Thermal Diode.

D1+

Anode Connection to First Thermal Diode.

VID4

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

+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.

+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.

+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.

VCCP

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

PWM1/

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

Ω typical pull-up.

XTO

Also functions as the output from the XOR tree in XOR test mode.

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