ADM1031

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2

Figure 1. Functional Block Diagram

SLAVE

ADDRESS

REGISTER

SERIAL BUS

INTERFACE

ADDRESS

POINTER

REGISTER

INTERRUPT

STATUS

REGISTERS

VALUE AND LIMIT

REGISTERS

OFFSET

REGISTERS

CONFIGURATION

REGISTERS

LIMIT

COMPARATOR

FAN FILTER

REGISTER

FAN

CHARACTERISTICS

REGISTER

ADD

SDA

SCL

GND

ADM1031

INT (SMBALERT)

THERM

FAN_FAULT

PWM_OUT1

D1+

D1–

ADC

FAN SPEED

CONFIG

REGISTER

FAN SPEED

COUNTER

ANALOG

MULTIPLEXER

PWM

CONTROLLERS

TACH SIGNAL

CONDITIONING

BANDGAP

TEMPERATURE

SENSOR

2.5V

BANDGAP

REFERENCE

TACH2/AIN2

TACH1/AIN1

PWM_OUT2

D2+

D2–

1

3

4

2

9

10

12

11

6

13

15

16

14

7

8

5

ABSOLUTE MAXIMUM RATINGS

Parameter

Rating

Unit

6.5

V

Voltage on Any Input or Output Pin

−0.3 to +6.5

V

Input Current at Any Pin

±5

mA

Package Input Current

±20

mA

150

°C

Storage Temperature Range

−65 to +150

°C

Lead Temperature, Soldering

Vapor Phase (60 sec)

Infrared (15 sec)

215

200

°C

ESD Rating − All Pins

2000

V

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

NOTE: This device is ESD sensitive. Use standard ESD precautions when handling.

THERMAL CHARACTERISTICS

Package Type

Unit

16−lead QSOP

105

39

°C/W