Datasheet > LM85

LM85

更新时间： 2024-10-31 22:47:03

品牌	Logo	应用领域
美国国家半导体 - NSC		风扇光电二极管监控
页数	文件大小	规格书
26页	258K
描述
Hardware Monitor with Integrated Fan Control

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数据手册

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LM85 数据手册

March 2003

LM85

Hardware Monitor with Integrated Fan Control

n Noise filtering of temperature reading for fan control

General Description

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

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

n XOR-tree test mode

– the V_CCP, 2.5V, 3.3VSBY, 5.0V, and 12V supplies (inter-

nal scaling resistors).

Key Specifications

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.

n Voltage Measurement Accuracy

n Resolution

2% FS (max)

8-bits, 1˚C

3˚C (max)

n Temperature Sensor Accuracy

n Temperature Range

— LM85 Operational

— Remote Temp Accuracy

0˚C to +85˚C

0˚C to +125˚C

n Power Supply Voltage

n Power Supply Current

+3.0V to +3.6V

0.53 mA

Features

n 2-wire, SMBus 2.0 compliant, serial digital interface

n 8-bit Σ∆ ADC

Applications

n Monitors V_CCP, 2.5V, 3.3 VSBY, 5.0V, and 12V

motherboard/processor supplies

n Desktop PC

n Microprocessor based equipment

n Monitors 2 remote thermal diodes

n Programmable autonomous fan control based on

temperature readings

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

Block Diagram

20035301

DS200353

www.national.com

12 3 4 5 6 7...26

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