ADT7490ARQZ-R7 datasheet(6/75 Pages) ONSEMI

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ADT7490

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PIN ASSIGNMENT

Pin No.

Mnemonic

Type

Description

SDA

Digital I/O

SMBus Bidirectional Serial Data. Open drain, requires SMBus pullup.

SCL

Digital Input

SMBus Serial Clock Input. Open drain, requires SMBus pullup.

GND

Ground

Ground Pin.

VCC

Power Supply

3.3 V ± 10%.

GPIO1

Digital Input/Output

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

switching load line resistors into VR load line circuitry or for switching LEDs

using external FETs.

GPIO2

Digital Input/Output

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

switching load line resistors into VR load line circuitry or for switching LEDs

using external FETs.

PECI

Digital Input/Output

PECI Input to Report CPU Thermal Information. PECI voltage level is

referenced on the VTT input.

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.

TACH3

Digital Input

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

PWM2/SMBALERT

Digital Output

Pulse−Width Modulated Output to Control Fan 2 Speed. Open drain requires

10 kW typical pullup. Digital Output (Open Drain). This pin can be

reconfigured as an SMBALERT interrupt output to signal out−of−limit

conditions.

TACH1

Digital Input

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

TACH2

Digital Input

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

PWM3/

ADDREN

Digital Output

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

10 kW typical pullup. If pulled low on powerup, the ADT7490 enters address

select mode, and the state of Pin 14 (ADDR SELECT) determines the

ADT7490 slave address.

TACH4/THERM/

SMBALERT/

ADDR SELECT

Digital Input/Output

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

May be reconfigured as a bidirectional THERM pin. Can be connected to the

PROCHOT output of the processor, to time and monitor PROCHOT assertions.

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

modulation purposes. 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. Can also be used at device powerup to assign

SMBus address.

D2−

Analog Input

Negative Connection for Remote Temperature Sensor 2.

D2+

Analog Input

Positive Connection to Remote Temperature Sensor 2.

D1−

Analog Input

Negative Connection for Remote Temperature Sensor 1.

D1+

Analog Input

Positive Connection to Remote Temperature Sensor 1.

IMON

Analog Input

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

controllers.

+5 VIN

Analog Input

Monitors 5.0 V Supply Using Internal Resistor Dividers.

+12 VIN

Analog Input

Monitors 12 V Supply Using Internal Resistor Dividers.

+2.5 VIN/THERM

Analog Input

Monitors 2.5 V Supply Using Internal Resistor Dividers. Alternatively, this pin

can be reconfigured as a bidirectional THERM pin. Can be connected to the

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

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

modulation purposes.

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

the ADC channel.

PWM1/XTO

Digital Output

Pulse−Width Modulated Output to Control Fan 1 Speed. Open drain requires

10 kW typical pullup. Also functions as the output for the XNOR tree test

enable mode.

ADT7490ARQZ-R7 Datasheet(PDF) 6 Page - ON Semiconductor

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