ADT7467ARQZ-R7 datasheet(6/77 Pages) ONSEMI

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ADT7467

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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

ADT7467

TOP VIEW

(Not to Scale)

SCL

GND

VCC

TACH3

PWM2/SMBALERT

TACH1

TACH2

PWM3

SDA

PWM1/XTO

VCCP

D1+

D1–

D2+

TACH4/GPIO/THERM/SMBALERT

D2–

Figure 3. Pin Configuration

Table 3. Pin Function Descriptions

Pin No.

Mnemonic

Description

SCL

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

GND

Ground Pin for the ADT7467.

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 ADT7467 can also be powered from a 5 V supply. Setting Bit 7 of Configuration Register 1

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

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 (low frequency mode only).

PWM2

Digital Output (Open Drain). Requires 10 kΩ typical pull-up. Pulse width modulated output to control the speed of

Fan 2. 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.

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 (low frequency mode only).

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 (low frequency mode only).

PWM3

Digital I/O (Open Drain). Pulse width modulated output to control the speed of Fan 3 and Fan 4. Requires 10 kΩ

typical pull-up. Can be configured as a high or low frequency drive.

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 (low frequency mode only).

GPIO

General-Purpose Open-Drain Digital I/O.

THERM

Alternatively, the pin can be reconfigured as a bidirectional THERM pin, which 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.

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 V).

PWM1

Digital Output (Open Drain). Pulse width modulated output to control the speed of Fan 1. Requires 10 kΩ typical

pull-up.

XTO

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 kΩ typical pull-up.

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