Datasheet > LM86BIMQX

LM86BIMQX

更新时间： 2024-11-03 08:54:23

品牌	Logo	应用领域
美国国家半导体 - NSC		光电二极管
页数	文件大小	规格书
28页	769K
描述
IC SPECIALTY ANALOG CIRCUIT, PDSO24, QSOP-24, Analog IC:Other

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数据手册

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LM86BIMQX 数据手册

OBSOLETE

October 5, 2011

LM85

Hardware Monitor with Integrated Fan Control

Noise filtering of temperature reading for fan control

■

General Description

1.0°C digital temperature sensor resolution

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

compatible with SMBus 2.0. Using an 8-bit ΣΔ ADC, the LM85

measures:

3 PWM fan speed control outputs

4 fan tachometer inputs

Monitors 5 VID control lines

24-pin QSOP package

– 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).

XOR-tree test mode

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 temper-

ature 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 included.

Key Specifications

Voltage Measurement Accuracy

±2% FS (max)

8-bits, 1°C

■

Resolution

Temperature Sensor Accuracy

Temperature Range

■

±3°C (max)

■

LM85 Operational

Remote Temp Accuracy

Power Supply Voltage

Power Supply Current

0°C to +85°C

0°C to +125°C

+3.0V to +3.6V

0.53 mA

—

Features

■

2-wire, SMBus 2.0 compliant, serial digital interface

■

8-bit ΣΔ ADC

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

motherboard/processor supplies

Applications

Desktop PC

■

Monitors 2 remote thermal diodes

■

Microprocessor based equipment

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

Programmable autonomous fan control based on

temperature readings

Block Diagram

20035301

200353

www.national.com

200353 Version 6 Revision 5 Print Date/Time: 2011/10/05 10:28:21

12 3 4 5 6 7...28

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