ADT7475_13 datasheet(3/58 Pages) ONSEMI

Part #	ADT7475

Description	Remote Thermal Monitor and Fan Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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ADT7475

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Table 3. PIN ASSIGNMENT

Pin No.

Mnemonic

Description

1

SCL

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

2

GND

Ground Pin.

3

VCC

B

Power Supply. VCC is also monitored through this pin.

4

TACH3

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

5

PWM2

SMBALERT

PWM2: 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.

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

output to signal out-of-limit conditions.

6

TACH1

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

7

TACH2

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

8

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.

9

TACH4

THERM

GPIO

SMBALERT

TACH4: Digital Input (Open Drain). Fan tachometer input to measure the speed of Fan 4.

THERM: Digital I/O (Open Drain). Alternatively, this pin can be reconfigured as a bidirectional THERM

pin that can be used to time and monitor assertions on the THERM input. For example, the pin can be

connected to the PROCHOT output of an Intel® Pentium® 4 processor or to the output of a trip point

temperature sensor. This pin can be used as an output to signal overtemperature conditions.

GPIO: General-Purpose Open Drain Digital I/O.

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

output to signal out-of-limit conditions.

10

D2−

Cathode Connection to Second Thermal Diode.

11

D2+

Anode Connection to Second Thermal Diode.

12

D1−

Cathode Connection to First Thermal Diode.

13

D1+

Anode Connection to First Thermal Diode.

14

VCCP

B

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

15

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.

16

SDA

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

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