ADM1027 データシートの表示（PDF） - Analog Devices

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ADM1027

dBCOOL™ Remote Thermal Controller and Voltage Monitor

Analog Devices 

ADM1027

PIN FUNCTION DESCRIPTIONS

Pin 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 for the ADM1027.

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 ADM1027 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

10 PWM2/SMBALERT

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.

Digital Output (Open-Drain). Requires 10 kW typical pull-up. Pulsewidth modulated output

to control Fan 2 speed. This pin may 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/ADDRESS ENABLE Digital I/O (Open-Drain). Pulsewidth modulated output to control Fan 3 speed. Requires

10 kW typical pull-up. If pulled low on power-up, this places the ADM1027 into address

select mode, and the state of Pin 14 will determine the ADM1027’s slave address.

14 TACH4/ADDRESS SELECT 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. If in address select mode,

this pin determines the SMBus device address.

15 D2–

Cathode Connection to Second Thermal Diode.

16 D2+

Anode Connection to Second Thermal Diode.

17 D1–

Cathode Connection to First Thermal Diode.

18 D1+

Anode Connection to First Thermal Diode.

19 VID4

Digital Input (Open-Drain). Voltage supply readouts from CPU. This value is read into the

VID register (Reg. 0x43).

20 5VIN

21 12VIN

22 2.5VIN

23

VCCP

24 PWM1/XTO

Analog Input. Monitors 5 V power supply.

Analog Input. Monitors 12 V power supply.

Analog Input. Monitors 2.5 V supply, typically a chipset voltage.

Analog Input. Monitors processor core voltage (0 V to 3 V).

Digital Output (Open-Drain). Pulsewidth modulated output to control Fan 1 speed. Requires

10 kW typical pull-up. Also functions as the output from the XOR tree in XOR test mode.

REV. A

–5–

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