ADT7490 datasheet(7/76 Pages) AD

Numer części	ADT7490

Szczegółowy opis	dBCool Remote Thermal Monitor and Fan Controller with PECI Interface

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ADT7490

Rev. 0 | Page 7 of 76

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

D1–

D2+

D2–

TACH4/THERM/SMBALERT/ADDR SELECT

+5VIN

+12VIN

+2.5VIN/THERM

VCCP

IMON

D1+

16

9

15

10

14

11

13

12

TACH1

TACH2

PWM3/ADDREN

20

5

19

6

18

7

17

8

GND

VCC

GPIO1

TACH3

VTT

PECI

GPIO2

21

4

22

3

23

2

SCL

PWM1/XTO

24

1

SDA

PWM2/SMBALERT

ADT7490

TOP VIEW

(Not to Scale)

Figure 3.Pin Configuration

Table 4. Pin Function Descriptions

Pin No.

Mnemonic

Type

Description

1

SDA

Digital I/O

SMBus Bidirectional Serial Data. Open drain, requires SMBus pull-up.

2

SCL

Digital Input

SMBus Serial Clock Input. Open drain, requires SMBus pull-up.

3

GND

Ground

Ground Pin.

4

VCC

Power Supply

3.3 V ± 10%.

5

GPIO1

Digital Input/Output

General-Purpose Open-Drain Digital Input/Output. Frequently used for switching

loadline resistors into VR loadline circuitry or for switching LEDs using external FETs.

6

GPIO2

Digital Input/Output

General-Purpose Open-Drain Digital Input/Output. Frequently used for switching

loadline resistors into VR loadline circuitry or for switching LEDs using external FETs.

7

PECI

Digital Input

PECI Input to Report CPU Thermal Information. PECI voltage level is referenced on the

VTT input

8

VTT

Analog Input

Voltage Reference for PECI. This is the supply voltage for the PECI interface and must be

present to measure temperature over the PECI interface. This voltage is also monitored

and presented in register 0x1E.

9

TACH3

Digital Input

Fan Tachometer Input to Measure Speed of FAN 3 (Open-Drain Digital Input).

10

PWM2/

Digital Output

Pulse Width Modulated Output to Control FAN 2 Speed. Open drain requires 10 kΩ

typical pull-up.

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

Fan Tachometer Input to Measure Speed Of Fan 1 (Open-Drain Digital Input.).

12

TACH2

Digital Input

Fan Tachometer Input To Measure Speed Of Fan 2 (Open-Drain Digital Input.).

13

PWM3/

Digital Output

Pulse Width Modulated Output to Control Fan 3 Speed. Open drain requires 10kΩ

typical pull-up.

ADDREN

If pulled low on power-up, the ADT7490 enters address select mode, and the state of

Pin 14 (ADDR SELECT) determines the ADT7490’s slave address.

14

TACH4/

Digital Input/Output

Fan Tachometer Input to Measure Speed of Fan 4 (Open-Drain Digital Input).

THERM/

May 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.

SMBALERT/

Active Low Digital Output. The SMBALERT Pin is used to signal out-of-limit comparisons

of temperature, voltage, and fan speed. This is compatible with SMBus alert.

ADDR SELECT

Can also be used at device power-up to assign SMBus address.

15

D2−

Analog Input

Negative Connection for Remote Temperature Sensor 2.

16

D2+

Analog Input

Positive Connection to Remote Temperature Sensor 2.

17

D1−

Analog Input

Negative Connection for Remote Temperature Sensor 1.

18

D1+

Analog Input

Positive Connection to Remote Temperature Sensor 1.

19

IMON

Analog Input

Monitors Current Output of Analog Devices ADP319x family of VRD10/VRD11

controllers.

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