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ADM1031

Intelligent Temperature Monitor and Dual PWM Fan Controller

Analog Devices 

ADM1031

Pin No.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

PIN FUNCTION DESCRIPTIONS

Mnemonic

Description

PWM_OUT1

TACH1/AIN1

PWM_OUT2

TACH2/AIN2

GND

VCC

THERM

FAN_FAULT

D1–

D1+

D2–

D2+

ADD

INT (SMBALERT)

SDA

SCL

Digital Output (Open-Drain). Pulsewidth modulated output to control fan speed. Requires pull-

up resistor (10 kΩ typical).

Digital/Analog Input. Fan tachometer input to measure FAN1 fan speed. May be reprogrammed as

an analog input to measure speed of a 2-wire fan via a sense resistor (2 Ω typical).

Digital Output (Open-Drain). Pulsewidth Modulated output to control FAN2 fan speed.

Requires pull-up resistor (10 kΩ typical).

Digital/Analog Input. Fan tachometer input to measure FAN2 fan speed. May be repro-

grammed as an analog input to measure speed of a 2-wire fan via a sense resistor (2 Ω typical).

System Ground.

Power. Can be powered by 3.3 V Standby power if monitoring in low power states is required.

Digital I/O (Open-Drain). An active low thermal overload output that indicates a violation of a

temperature set point (overtemperature). Also acts as an input to provide external fan control.

When this pin is pulled low by an external signal, a status bit is set, and the fan speed is set to

full-on. Requires pull-up resistor (10 kΩ).

Digital Output (Open-Drain). Can be used to signal a fan fault. Drives second fan to full speed

if one fan fails. Requires pull-up resistor (typically 10 kΩ).

Analog Input. Connected to cathode of first remote temperature-sensing diode. The temperature-

sensing element is either a Pentium III substrate transistor or a general-purpose 2N3904.

Analog Input. Connected to anode of first remote temperature-sensing diode.

Analog Input. Connected to cathode of second remote temperature-sensing diode.

Analog Input. Connected to anode of second remote temperature-sensing diode.

Three-State Logic Input. Sets two lower bits of device SMBus address.

Digital Output (Open-Drain). Can be programmed as an interrupt (SMBus ALERT) output for

temperature/fan speed interrupts. Requires pull-up resistor (10 kΩ typical).

Digital I/O. Serial Bus Bidirectional Data. Open-drain output. Requires pull-up resistor

(2.2 kΩ typical).

Digital Input. Serial Bus Clock. Requires pull-up resistor (2.2 kΩ typical).

PIN CONFIGURATION

PWM_OUT1 1

16 SCL

TACH1/AIN1 2

15 SDA

PWM_OUT2 3 ADM1031 14 INT (SMBALERT)

TACH2/AIN2 4

13 ADD

GND

5

TOP VIEW

(Not to Scale) 12

D2+

VCC 6

11 D2–

THERM 7

10 D1+

FAN_FAULT 8

9 D1–

–4–

REV. 0

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