Datasheet > NCT7491

NCT7491

更新时间： 2024-11-08 01:10:27

品牌	Logo	应用领域
安森美 - ONSEMI		/
页数	文件大小	规格书
80页	791K
描述
Remote Thermal Monitor and Fan Controller

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NCT7491 数据手册

NCT7491

Remote Thermal Monitor

and Fan Controller with

PECI 3.0 Interface and

SMBus Compatible Master

www.onsemi.com

The NCT7491 is a two−wire serially programmable hardware

monitor. It can monitor 2 remote temperature zones and its own

ambient temperature. A PECI 3.0 single wire interface allows the

NCT7491 to monitor CPU temperatures. The NCT7491 also

implements an SMBus compatible master, allowing it to read

automatically from thermal sensors on the SMBus. The NCT7491 can

automatically control the speed of 3 fans using PWM control, and

monitor the speed of 4 fans. There are 4 analog inputs, used for

measuring 12 V, 5 V, 2.5 V and Vccp channels. The NCT7491 supply

QFN24

MN SUFFIX

CASE 485L

QSOP24

RQ SUFFIX

CASE 492B

voltage and PECI V

voltage are also monitored. Each of the

measured temperature, voltage and fan speed values are compared

with programmable limits and if any channel is outside the

programmed limit an interrupt is generated via the ALERT output pin.

A THERM output is also available for fail−safe thermal control. Up to

3 GPIO pins are available for digital control or signalling.

MARKING DIAGRAMS

NCT

7491

ALYWG

Communication with the NCT7491 is accomplished via the

(Top View)

SMBus/I C interface which is compatible with industry standard

protocols. The SMBus address is set by 2 address selection pins.

The NCT7491 is available in a 24−lead QFN or QSOP package and

operates over a supply range of 3.0 V to 3.6 V.

= Assembly Location

= Wafer Lot

= Year

= Work Week

= Pb−Free Package

Features

(Note: Microdot may be in either location)

• PECI 3.0 Master for CPU Monitoring

• SMBus Compatible Master

• On−chip Temperature Sensor

NCT7491

YYWWG

• 2 Remote Sensor Channels

• Series Resistance Cancellation on Remote Sensors

• 3 PWM Fan Control Outputs

• 4 Tach Monitoring Input

(Top View)

(Bottom View)

NCT7491 = Specific Device Code

= Assembly Location

= Year

= Work Week

• PWM Automatic Fan Speed Control

• 4 Analog Inputs for Voltage Monitoring

• Vdd Supply Voltage Monitoring

= Pb−Free Package

• PECI V Voltage Monitoring

• Overtemperature Outputs

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 79 of this data sheet.

• Limit Comparison of Monitored Channels

• SMBus Address Selection Allows up to 3 Devices

• Meets SMBus 2.0 Electrical Specifications (fully SMBus 1.1

compliant)

• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS

Compliant

Publication Order Number:

June, 2016 − Rev. 3

NCT7491/D

12 3 4 5 6 7...80

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