ADM1031ARQZR7 查看數據表（PDF） - ON Semiconductor

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ADM1031ARQZR7

Intelligent Temperature Monitor and Dual PWM Fan Controller

ON Semiconductor 

ADM1031

PIN ASSIGNMENT

Pin No.

Mnemonic

1

PWM_OUT1

2

TACH1/AIN1

3

PWM_OUT2

4

TACH2/AIN2

5

GND

6

VCC

7

THERM

8

FAN_FAULT

9

D1–

10

D1+

11

D2–

12

D2+

13

ADD

14

INT(SMBALERT)

15

SDA

16

SCL

Description

Digital Output, Open−Drain. Pulse width modulated output to control fan speed. Requires pullup

resistor (10 kW typical).

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

analog input to measure speed of a 2−wire fan via a sense resistor (2 W typical).

Digital Output, Open−Drain. Pulse width modulated output to control FAN2 fan speed. Requires

pullup resistor (10 kW typical).

Digital/Analog Input. Fan tachometer input to measure FAN2 fan speed. Can be reprogrammed as an

analog input to measure speed of a 2−wire fan via a sense resistor (2 W 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 pullup resistor (10 kW).

Digital Output, Open−Drain. Can be used to signal a fan fault. Drives second fan to full speed if one

fan fails. Requires pullup resistor (typically 10 kW).

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 pullup resistor (10 kW typical).

Digital I/O, Serial Bus Bidirectional Data. Open−drain output. Requires pullup resistor (2.2 kW typical).

Digital Input, Serial Bus Clock. Requires pullup resistor (2.2 kW typical).

ELECTRICAL CHARACTERISTICS TA = TMIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted. (Note 1)

Parameter

Test Conditions/Comments

Min

Typ

Max Unit

POWER SUPPLY

Supply Voltage, VCC

Supply Current, ICC

Interface inactive, ADC active

Standby mode

3.0

3.3

3.6

V

1.4

3.0

mA

32

50

mA

TEMPERATURE−TO−DIGITAL CONVERTER

Local Sensor Accuracy

±1.0 ±3.0

°C

Resolution

0.25

°C

Remote Diode1 Sensor Accuracy

Remote Diode2 Sensor Accuracy

Resolution

60°C ≤ TD ≤ 100°C

60°C ≤ TD ≤ 100°C

±0.5 ±1.0

°C

±0.5 ±1.75

°C

0.125

°C

Remote Sensor Source Current

High level

Low level

180

mA

11

OPEN−DRAIN DIGITAL OUTPUTS (THERM, INT, FAN_FAULT, PWM_OUT)

Output Low Voltage, VOL

High−Level Output Leakage Current, IOH

IOUT = –6.0 mA; VCC = 3.0 V

VOUT = VCC; VCC = 3.0 V

0.4

V

0.1

1.0

mA

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