NCT72CMTR2G Datasheet, PDF (1/20 Pages) ON Semiconductor – Temperature Monitor with Series Resistance Cancellation

NCT72
+15C Temperature Monitor
with Series Resistance
Cancellation
The NCT72 is a dual-channel digital thermometer and
undertemperature/overtemperature alarm, intended for use in PCs and
thermal management systems. It is pin and register compatible with the
NCT1008 but the NCT72 allows the user to pull the ALERT pin to
1.8 V without increasing the device Idd. A feature of the NCT72 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
NCT72 has a configurable ALERT output and an extended, switchable
temperature measurement range.
The NCT72 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 NCT1008, but it can be switched to a wider measurement range
of −64C to +191C.
The NCT72 communicates over a 2-wire serial interface, compatible
with system management bus (SMBus/I²C) standards. The default
SMBus/I²C address of the NCT72 is 0x4C. An NCT72D is available
with an SMBus/I²C address of 0x4D. This is useful if more than one
NCT72 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
 Pin and Register Compatible with NCT1008
 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
 These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
 Smart Phones
 Desktop and Notebook Computers
 Smart Batteries
 Automotive
 Embedded Systems
 Semiconductor Components Industries, LLC, 2012
1
August, 2012 − Rev. 4
http://onsemi.com
WDFN8
CASE 511AT
DFN8
CASE 506BJ
PIN ASSIGNMENT
V_DD 1
D+ 2
D− 3
THERM 4
8 SCLK
7 SDATA
6 ^ALERT/
THERM2
5 GND
(Top View)
MARKING DIAGRAMS
1
7xMG
G
WDFN8
7x = Device Code (Where x = C or D)
M = Date Code
G = Pb-Free Package
(Note: Microdot may be in either location)
1 _NCT 8
72x
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.
Publication Order Number:
NCT72/D