NCT1008CMT3R2G 查看數據表（PDF） - ON Semiconductor

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NCT1008CMT3R2G

±1°C Temperature Monitor with Series Resistance Cancellation

ON Semiconductor 

NCT1008

+15C Temperature Monitor

with Series Resistance

Cancellation

The NCT1008 is a dual−channel digital thermometer and

undertemperature/overtemperature alarm, intended for use in PCs and

thermal management systems. It is register−compatible with the

ADM1032 and ADT7461. A feature of the NCT1008 is series

resistance cancellation, where up to 1.5 kW (typical) of resistance in

series with the temperature monitoring diode can be automatically

cancelled from the temperature result, allowing noise filtering. The

NCT1008 has a configurable ALERT output and an extended,

switchable temperature measurement range.

The NCT1008 can measure the temperature of a remote thermal

diode accurate to ±1°C and the ambient temperature accurate to ±3°C.

The temperature measurement range defaults to 0°C to +127°C,

compatible with the ADM1032, but it can be switched to a wider

measurement range of −64°C to +191°C.

The NCT1008 communicates over a 2−wire serial interface,

compatible with system management bus (SMBus/I2C) standards. The

default SMBus/I2C address of the NCT1008 is 0x4C. An NCT1008D is

available with an SMBus/I2C address of 0x4D. This is useful if more

than one NCT1008 is used on the same SMBus/I2C.

An ALERT output signals when the on−chip or remote temperature is

out of range. The THERM output is a comparator output that allows

on/off control of a cooling fan. The ALERT output can be reconfigured

as a second THERM output, if required.

Features

• On−Chip and Remote Temperature Sensor

• 0.25°C Resolution/1°C Accuracy on Remote Channel

• 1°C Resolution/1°C Accuracy on Local Channel

• Series Resistance Cancellation Up to 1.5 kW

• Extended, Switchable Temperature Measurement Range

0°C to +127°C (Default) or –64°C to +191°C

• Register−Compatible with ADM1032 and ADT7461

• Remote THERM Limit of 108°C

• 2−Wire SMBus/I2C Serial Interface with SMBus Alert Support

• Programmable Over/Undertemperature Limits

• Offset Registers for System Calibration

• Up to Two Overtemperature Fail−Safe THERM Outputs

• Small 8−Lead DFN

• 240 mA Operating Current, 5 mA Standby Current

• Compatible with 1.8 V Logic

• Pb−Free Packages are Available

Applications

• Smart Phones

• Desktop and Notebook Computers

• Smart Batteries

• Automotive

• Embedded Systems

http://onsemi.com

WDFN8

CASE 511AT

1

DFN8

CASE 506BJ

1

MARKING DIAGRAMS

1

8xMG

G

1 NCT 8

1008x

ALYWG

G

8x = Device Code (Where x = C or D)

M = Date Code

G = Pb−Free Package

x = C or D

A = Assembly Location

L = Wafer Lot

Y = Year

W = Work Week

G = Pb−Free Package

(Note: Microdot may be in either location)

PIN ASSIGNMENT

VCC 1

8 SCLK

D+ 2

7 SDATA

D− 3

6 ALERT/THERM2

THERM 4

5 GND

(Top View)

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 18 of this data sheet.

© Semiconductor Components Industries, LLC, 2010

1

August, 2010 − Rev. 3

Publication Order Number:

NCT1008/D

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