ADT7473 datasheet(5/74 Pages) ONSEMI

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ADT7473

http://onsemi.com

PIN ASSIGNMENT

Pin No.

Mnemonic

Description

SCL

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

GND

Ground Pin.

VCC

Power Supply. Powered by 3.3 V.

TACH3

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3.

ADDR SELECT

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

PWM2

Digital Output (Open Drain). ADT7473 default pin function is PWM2. Requires 10 kW typical pullup.

Pulse−width modulated output to control Fan 2 speed. Can be configured as a high or low frequency

drive.

SMBALERT

On the ADT7473, this pin can be reconfigured as an SMBALERT interrupt output to signal out−of−limit

conditions.

THERM_LATCH

ADT7473−1 default pin function. THERM_LATCH is a thermal event alert signal when an

overtemperature condition occurs.

TACH1

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

TACH2

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

PWM3

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.

ADDREN

If pulled low on powerup, the ADT7473−1 enters address select mode, and the state of Pin 4

(ADDR SELECT) determines the ADT7473−1 slave address.

TACH4

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4.

GPIO

General Purpose Open Drain Digital I/O.

THERM

Bidirectional THERM pin. Can be used to time and monitor assertions on the THERM input as well as

to assert when an ADT7473 THERM overtemperature limit is exceeded. For example, the pin can be

connected to the PROCHOT output of an IntelR PentiumR 4 processor or to the output of a trip point

temperature sensor. Can be used as an output to signal overtemperature conditions.

SMBALERT

Digital Output (Open Drain). This pin can be reconfigured as an SMBALERT interrupt output to signal

out−of−limit 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.

VCCP

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

PWM1

XTO

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

typical pullup.

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

SDA

Digital I/O (Open Drain). SMBus bidirectional serial data. Requires 10 kW typical pullup.

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