ASC7611 ETC2 [List of Unclassifed Manufacturers], ASC7611 Datasheet

ASC7611

Manufacturer Part Number

ASC7611

Description

HARDWARE MONITOR WITH INTEGRATED FAN CONTROL

Manufacturer

ETC2 [List of Unclassifed Manufacturers]

Datasheet

1.ASC7611.pdf (40 pages)

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Preliminary Specification

Product Description

The aSC7611 has a two wire digital interface compatible

with SMBus 2.0. Using a 10-bit ΣΔ- ADC, the aSC7611

measures the temperature of two remote diode connected

transistors as well as its own die.

Using temperature information from these three zones, an

automatic fan speed control algorithm is employed to

minimize acoustic impact while achieving recommended

CPU temperature under varying operational loads.

To set fan speed, the aSC7611 has three independent

pulse width modulation (PWM) outputs that are controlled

by one, or a combination of three, temperature zones.

Both high- and low-frequency PWM ranges are supported.

The aSC7611 also includes a digital filter that can be

invoked to smooth temperature readings for better control

of fan speed and minimum acoustic impact. The aSC7611

has tachometer inputs to measure fan speed on up to four

fans. Limit and status registers for all measured values are

included to alert the system host that any measurements

are outside of programmed limits via status registers.

System voltages of VCCP, 2.5V, 3.3V, 5.0V, and 12V

motherboard power are monitored efficiently with internal

scaling resistors.

Features

Ordering Information

aSC7611QS24

Ayww – Assembly site, year, workweek

•

Part Number

2-wire, SMBus 2.0 compliant, serial interface

10-bit ΣΔ-ADC

Monitors internal and remote thermal diodes

Monitors VCCP, 2.5V, 3.3V, 5.0V, and 12V

motherboard/processor supplies

Programmable autonomous fan control based on

temperature readings

Noise filtering of temperature reading for fan

control

0.25°C digital temperature sensor resolution

3 PWM fan speed control outputs for 2-, 3- or 4-

wire fans.

Provides high and low PWM frequency ranges

4 fan tachometer inputs

Monitors 5 VID control lines

24-Lead QSOP package

XOR-tree test mode

24-lead QSOP

Package

0°C to +120°C, 3.3V

and Operating Voltage

Temperature Range

www.andigilog.com

- 1 -

SMBDAT

SMBCLK

TACH3

TACH1

TACH2

PWM2

GND

VID0

VID1

VID2

VID3

3.3V

Measurement System

Temperature:

Voltage:

Fan Tachometer:

Limit alarms for all measured values

Applications

Connection Diagram

•

0.25°C resolution, ±2°C accuracy on remote diode

0.25°C resolution, ±3°C accuracy on local sensor

Temperature measurement range on remote

sensor –55°C to +125°C using 2’s complement

coding.

10-bit Resolution, ±2% of Full Scale

16-bit count of 90kHz clock periods

Desktop Computers – Motherboards and Graphics

Cards

Laptop Computers

Microprocessor based equipment (e.g. Base-

stations, Routers, ATMs, Point of Sales)

RODUCT

ITH

aSC7611

Marking

aSC7611

Ayww

NTEGRATED

ARDWARE

2500 units Tape & Reel

PECIFICATION

October 2006 - 70A05007

aSC7611

How Supplied

PWM1/

XTESTOUT

VCCP

2.5V

12V

VID4

REMOTE 1+

REMOTE 1-

REMOTE 2+

REMOTE 2-

TACH4/

AddressSelect

PWM3/

AddressEnable

ONTROL

ONITOR

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