ADT7475 データシートの表示（PDF） - ON Semiconductor

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ADT7475

dBCOOL® Remote Thermal Monitor and Fan Controller

ON Semiconductor 

PIN ASSIGNMENT

Pin No.

Mnemonic

1

SCL

2

GND

3

VCCB

4

TACH3

5

PWM2

SMBALERT

6

TACH1

7

TACH2

8

PWM3

9

TACH4

THERM

GPIO

SMBALERT

10

D2−

11

D2+

12

D1−

13

D1+

14

VCCPB

15

PWM1

XTO

16

SDA

ADT7475

Description

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

Ground Pin.

Power Supply. VCC is also monitored through this pin.

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

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.

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

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

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.

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.

Cathode Connection to Second Thermal Diode.

Anode Connection to Second Thermal Diode.

Cathode Connection to First Thermal Diode.

Anode Connection to First Thermal Diode.

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

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.

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

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