ADT7490ARQZ datasheet(8/76 Pages) AD

Part #	ADT7490ARQZ

Description	dBCool Remote Thermal Monitor and Fan Controller with PECI Interface

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ADT7490

Rev. 0 | Page 8 of 76

Pin No.

Mnemonic

Type

Description

20

+5VIN

Analog Input

Monitors 5 V Supply Using Internal Resistor Dividers.

21

+12VIN

Analog Input

Monitors 12 V Supply Using Internal Resistor Dividers.

22

+2.5VIN/

Analog Input

Monitors 2.5 V Supply Using Internal Resistor Dividers.

THERM

Alternatively, this pin can be reconfigured as a bidirectional THERM pin. Can be

connected to PROCHOT output of processor to time and monitor PROCHOT assertions.

Can be used as an output to signal overtemperature conditions or for clock modulation

purposes.

23

VCCP

Analog Input

Monitors CPU VCC Voltage (to maximum of 3.0 V). All voltage inputs can have their

resistor dividers removed allowing for full-scale input of 2.25 V of ADC channel.

24

PWM1/

Digital Output

Pulse Width Modulated Output to Control FAN 1 Speed. Open drain requires 10 kΩ

typical pull-up.

XTO

Also functions as the output for the XNOR tree test enable mode.

Table 5. Comparison of ADT7490 and ADT7476A Configurations

Pin Number

ADT7490

ADT7476A

1

SDA

2

SCL

3

GND

4

VCC

5

GPIO1

VID0/GPIO0

6

GPIO2

VID1/GPIO1

7

PECI

VID2/GPIO2

8

VTT

VID3/GPIO3

9

TACH3

10

PWM2/SMBALERT

11

TACH1

12

TACH2

13

PWM3/ADDREN

14

TACH4/THERM/SMBALERT/ADDR SELECT

TACH4/THERM/SMBALERT/GPIO6/ADDR SELECT

15

D2−

16

D2+

17

D1−

18

D1+

19

IMON

VID4/GPIO4

20

+5VIN

21

+12VIN

+12VIN/VID5

22

+2.5VIN/THERM

23

VCCP

24

PWM1/XTO

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