LM85 datasheet(1/26 Pages) NSC

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LM85

Hardware Monitor with Integrated Fan Control

General Description

The LM85, hardware monitor, has a two wire digital interface

compatible with SMBus 2.0. Using an 8-bit

Σ∆ ADC, the

LM85 measures:

– the temperature of two remote diode connected transis-

tors as well as its own die

– the V

CCP, 2.5V, 3.3VSBY, 5.0V, and 12V supplies (inter-

nal scaling resistors).

To set fan speed, the LM85 has three PWM outputs that are

each controlled by one of three temperature zones. The

LM85 includes a digital filter that can be invoked to smooth

temperature readings for better control of fan speed. The

LM85 has four tachometer inputs to measure fan speed.

Limit and status registers for all measured values are in-

cluded.

Features

n

2-wire, SMBus 2.0 compliant, serial digital interface

n

8-bit

Σ∆ ADC

n

Monitors V

CCP, 2.5V, 3.3 VSBY, 5.0V, and 12V

motherboard/processor supplies

n

Monitors 2 remote thermal diodes

n

Programmable autonomous fan control based on

temperature readings

n

Noise filtering of temperature reading for fan control

n

1.0˚C digital temperature sensor resolution

n

3 PWM fan speed control outputs

n

4 fan tachometer inputs

n

Monitors 5 VID control lines

n

24-pin QSOP package

n

XOR-tree test mode

Key Specifications

n

Voltage Measurement Accuracy

±2% FS (max)

n

Resolution

8-bits, 1˚C

n

Temperature Sensor Accuracy

±3˚C (max)

n

Temperature Range

— LM85 Operational

0˚C to +85˚C

— Remote Temp Accuracy

0˚C to +125˚C

n

Power Supply Voltage

+3.0V to +3.6V

n

Power Supply Current

0.53 mA

Applications

n

Desktop PC

n

Microprocessor based equipment

(e.g. Base-stations, Routers, ATMs, Point of Sales)

Block Diagram

20035301

March 2003

DS200353

www.national.com

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