ADT7468 datasheet(6/81 Pages) ONSEMI

Part #	ADT7468

Description	dBCool짰 Remote Thermal Controller and Voltage Monitor

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Manufacturer	ONSEMI [ON Semiconductor]

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ADT7468

Rev. 3 | Page 6 of 81 | www.onsemi.com

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

5

6

7

8

9

10

11

12

20

19

18

17

16

15

14

13

VID0

VID1

VID2

VID3

TACH1

TACH2

+5VIN/THERM

VID4

D1+

TACH3

PWM2/SMBALERT

D1–

1

2

3

4

24

23

22

21

SDA

SCL

GND

VCC

PWM1/XTO

VCCP

+2.5VIN

+12VIN/VID5

D2+

D2–

PWM3

TACH4/GPIO/THERM/SMBALERT

ADT7468

TOP VIEW

(NOT TO SCALE)

Figure 3. Pin Configuration

Table 3. Pin Function Descriptions

No.

Mnemonic

Description

1

SDA

Digital I/O (Open Drain). SMBus bidirectional serial data. Requires pull-up resistor.

2

SCL

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

3

GND

Ground Pin.

4

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 ADT7468 can also be powered from a 5 V supply. Setting Bit 7 of Configuration Register 1

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

5

VID0

Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).

6

VID1

Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).

7

VID2

Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).

8

VID3

Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).

9

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.

10

PWM2

Digital Output (Open Drain). Requires 10 kΩ typical pull-up. 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.

11

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.

12

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.

13

PWM3

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

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

14

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.

GPIO

General Purpose Open Drain Digital I/O.

THERM

Alternatively, the pin can be reconfigured as a bidirectional THERM pin. Can be used to time and monitor assertions

on the THERM input. For example, this 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 also 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.

15

D2–

Cathode Connection to Second Thermal Diode.

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