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NCT1008 Datasheet, PDF (1/20 Pages) ON Semiconductor – ±1˚C Temperature Monitor with Series Resistance Cancellation | |||
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NCT1008
+15C Temperature Monitor
with Series Resistance
Cancellation
The NCT1008 is a dualâchannel digital thermometer and
undertemperature/overtemperature alarm, intended for use in PCs and
thermal management systems. It is registerâcompatible 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 â64°C to +191°C.
The NCT1008 communicates over a 2âwire 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 onâchip 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
⢠OnâChip 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 â64°C to +191°C
⢠RegisterâCompatible with ADM1032 and ADT7461
⢠Remote THERM Limit of 108°C
⢠2âWire SMBus/I2C Serial Interface with SMBus Alert Support
⢠Programmable Over/Undertemperature Limits
⢠Offset Registers for System Calibration
⢠Up to Two Overtemperature FailâSafe THERM Outputs
⢠Small 8âLead DFN
⢠240 mA Operating Current, 5 mA Standby Current
⢠Compatible with 1.8 V Logic
⢠PbâFree 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 = PbâFree Package
x = C or D
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = PbâFree Package
(Note: Microdot may be in either location)
PIN ASSIGNMENT
VCC 1
8 SCLK
D+ 2
7 SDATA
Dâ 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 â Rev. 3
Publication Order Number:
NCT1008/D
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