ADT7476 datasheet(7/72 Pages) AD

Part #	ADT7476

Description	dBCool Remote Thermal Controller and Voltage Monitor

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ADT7476

Rev. A | Page 7 of 72

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

20

19

18

17

16

15

14

13

+5VIN

VID4/GPIO4

D1+

D1–

24

23

22

21

PWM1/XTO

VCCP

+2.5VIN/THERM

+12VIN/VID5

D2+

D2–

PWM3/ADDREN

TACH4/THERM/SMBALERT/GPIO6/ADDR SELECT

5

6

7

8

9

10

11

12

VID0/GPIO0

VID1/GPIO1

VID2/GPIO2

VID3/GPIO3

TACH1

TACH2

TACH3

PWM2/SMBALERT

1

2

3

4

SDA

SCL

GND

VCC

ADT7476

TOP VIEW

(Not to Scale)

Figure 3. Pin Configuration

Table 4. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

SDA

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

2

SCL

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

3

GND

Ground Pin.

4

VCC

Power Supply. Powered by 3.3 V standby, if monitoring in low power states is required. VCC is also monitored

through this pin.

5

VID0

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

GPIO0

General-Purpose Open-Drain Digital I/O.

6

VID1

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

GPIO1

General-Purpose Open-Drain Digital I/O.

7

VID2

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

GPIO2

General-Purpose Open-Drain Digital I/O.

8

VID3

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

GPIO3

General-Purpose Open-Drain Digital I/O.

9

TACH3

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

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.

12

TACH2

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

13

PWM3

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

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

ADDREN

If pulled low on power-up, the ADT7476 enters address select mode, and the state of Pin 14 (ADDR SELECT)

determines the ADT7476 slave address.

14

TACH4

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

THERM

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

the THERM input. For example, can be connected to the PROCHOT output of an Intel Pentium 4 processor or to

the output of a trip point temperature sensor. 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.

GPIO6

General-Purpose Open-Drain Digital I/O.

ADDR SELECT

If in address select mode, the logic state of this pin defines the SMBus device address.

15

D2–

Cathode Connection to Second Thermal Diode.

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