ADT7460ARQZ-REEL datasheet(3/47 Pages) ONSEMI

部件名	ADT7460ARQZ-REEL

功能描述	Remote Thermal Monitor and Fan Controller

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制造商	ONSEMI [ON Semiconductor]

网页	http://www.onsemi.com

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ADT7460

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Table 2. THERMAL CHARACTERISTICS

Package Type

qJA

qJC

Unit

16-lead QSOP

150

39

°C/W

1. qJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages.

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 for the ADT7460.

3

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 ADT7460 can also be powered from a 5.0 V

supply. Setting Bit 7 of Configuration Register 1 (Reg. 0x40) rescales the VCC input attenuators

to correctly measure a 5.0 V supply.

4

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.

5

PWM2

Digital Output (Open-Drain). Requires 10 kW typical pullup. 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.

6

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.

7

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.

8

PWM3

Digital I/O (Open-Drain). Pulse-width modulated output to control Fan 3/4 speed. Requires

10 kW typical pullup.

ADDRESS ENABLE

If pulled low on powerup, this places the ADT7460 into address select mode, and the state of

Pin 9 determines the ADT7460’s slave address.

9

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 SELECT

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

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.

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

+2.5 VIN

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.

15

PWM1/XTO

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

10 kW typical pullup.

16

SDA

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

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