NCT1008_12 Datasheet, PDF (1/20 Pages) ON Semiconductor – Temperature Monitor

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
DFN8
CASE 506BJ
PIN ASSIGNMENT
V_DD 1
8 SCLK
D+ 2
D− 3
THERM 4
7 SDATA
6
ALERT/
THERM2
5 GND
(Top View)
MARKING DIAGRAMS
1
8xMG
G
WDFN8
8x = Device Code (Where x = C or D)
M = Date Code
G = Pb-Free Package
1 _NCT 8
1008x
ALYWG
G
DFN8
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)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
 Semiconductor Components Industries, LLC, 2012
1
July, 2012 − Rev. 6
Publication Order Number:
NCT1008/D