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ADM1027ARQ-REEL7

dBCOOL™ Remote Thermal Controller and Voltage Monitor

ON Semiconductor 

dBCOOL™ Remote Thermal

Controller and Voltage Monitor

ADM1027*

FEATURES

Monitors up to 5 Supply Voltages

Controls and Monitors up to 4 Fan Speeds

1 On-Chip and 2 Remote Temperature Sensors

Monitors up to 5 Processor VID Bits

Automatic Fan Speed Control Mode Controls System

Cooling Based on Measured Temperature

Enhanced Acoustic Mode Dramatically Reduces User

Perception of Changing Fan Speeds

2-Wire and 3-Wire Fan Speed Measurement

Limit Comparison of All Monitored Values

Meets SMBus 2.0 Electrical Specifications

(Fully SMBus 1.1 Compliant)

APPLICATIONS

Low Acoustic Noise PCs

Networking and Telecommunications Equipment

GENERAL DESCRIPTION

The ADM1027 dBCOOL controller is a complete systems

monitor and multiple PWM fan controller for noise sensitive

applications requiring active system cooling. It can monitor

12 V, 5 V, 2.5 V CPU supply voltage, plus its own supply volt-

age. It can monitor the temperature of up to two remote sensor

diodes, plus its own internal temperature. It can measure and

control the speed of up to four fans so that they operate at the

lowest possible speed for minimum acoustic noise. The auto-

matic fan speed control loop optimizes fan speed for a given

temperature. Once the control loop parameters are programmed,

the ADM1027 can vary fan speed without CPU intervention.

FUNCTIONAL BLOCK DIAGRAM

ADDR

SELECT ADDR EN SCL SDA SMBALERT

VID4

VID3

VID2

VID1

VID0

PWM1

PWM2

PWM3

TACH1

TACH2

TACH3

TACH4

VCC

D1+

D1–

D2+

D2–

+5VIN

+12VIN

+2.5VIN

VCCP

PWM

REGISTERS

AND

CONTROLLERS

VID

REGISTER

ACOUSTIC

ENHANCEMENT

CONTROL

SMBUS

ADDRESS

SELECTION

SERIAL BUS

INTERFACE

ADDRESS

POINTER

REGISTER

AUTOMATIC

FAN SPEED

CONTROL

PWM

CONFIGURATION

REGISTERS

VCC TO ADM1027

FAN SPEED

COUNTER

BAND GAP

TEMP. SENSOR

INPUT

SIGNAL

CONDITIONING

AND

ANALOG

MULTIPLEXER

ADM1027

10-BIT

ADC

BAND GAP

REFERENCE

INTERRUPT

MASKING

INTERRUPT

STATUS

REGISTERS

LIMIT

COMPARATORS

VALUE AND

LIMIT

REGISTERS

GND

*Protected by U.S. Patent Nos. 6,188,189; 6,169,442; 6,097,239; 5,982,221;

and 5,867,012. Other patents pending.

©2010 SCILLC. All rights reserved.

May 2010 - Rev. 3

Publication Order Number:

ADM1027/D

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