?Semiconductor Components Industries, LLC, 2012
August, 2012 Rev. 4
1
Publication Order Number:
NCT72/D
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 ?癈 and the ambient temperature accurate to ?癈. The
temperature measurement range defaults to 0癈 to +127癈, compatible
with the NCT1008, but it can be switched to a wider measurement range
of 64癈 to +191癈.
The NCT72 communicates over a 2-wire serial interface, compatible
with system management bus (SMBus/I
2
C) standards. The default
SMBus/I
2
C address of the NCT72 is 0x4C. An NCT72D is available
with an SMBus/I
2
C address of 0x4D. This is useful if more than one
NCT72 is used on the same SMBus/I
2
C.
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
?SPAN class="pst NCT72CMNR2G_2296365_4"> On-chip and Remote Temperature Sensor
?SPAN class="pst NCT72CMNR2G_2296365_4"> 0.25?/SPAN>C Resolution/1?/SPAN>C Accuracy on Remote Channel
?SPAN class="pst NCT72CMNR2G_2296365_4"> 1?/SPAN>C Resolution/1?/SPAN>C Accuracy on Local Channel
?SPAN class="pst NCT72CMNR2G_2296365_4"> Series Resistance Cancellation Up to 1.5 kW
?SPAN class="pst NCT72CMNR2G_2296365_4"> Extended, Switchable Temperature Measurement Range
0癈 to +127癈 (Default) or 64癈 to +191癈
?SPAN class="pst NCT72CMNR2G_2296365_4"> Pin and Register Compatible with NCT1008
?SPAN class="pst NCT72CMNR2G_2296365_4"> Remote THERM
Limit of 108癈
?SPAN class="pst NCT72CMNR2G_2296365_4"> 2-wire SMBus/I
2
C Serial Interface with SMBus Alert Support
?SPAN class="pst NCT72CMNR2G_2296365_4"> Programmable Over/Undertemperature Limits
?SPAN class="pst NCT72CMNR2G_2296365_4"> Offset Registers for System Calibration
?SPAN class="pst NCT72CMNR2G_2296365_4"> Up to Two Overtemperature Fail-safe THERM
Outputs
?SPAN class="pst NCT72CMNR2G_2296365_4"> Small 8-lead DFN
?SPAN class="pst NCT72CMNR2G_2296365_4"> 240 mA Operating Current, 5 mA Standby Current
?SPAN class="pst NCT72CMNR2G_2296365_4"> Compatible with 1.8 V Logic
?SPAN class="pst NCT72CMNR2G_2296365_4"> These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
?SPAN class="pst NCT72CMNR2G_2296365_4"> Smart Phones
?SPAN class="pst NCT72CMNR2G_2296365_4"> Desktop and Notebook Computers
?SPAN class="pst NCT72CMNR2G_2296365_4"> Smart Batteries
?SPAN class="pst NCT72CMNR2G_2296365_4"> Automotive
?SPAN class="pst NCT72CMNR2G_2296365_4"> Embedded Systems
MARKING DIAGRAMS
http://onsemi.com
PIN ASSIGNMENT
(Top View)
DFN8
CASE 506BJ
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
ORDERING INFORMATION
NCT
72x
ALYWG
G
1
8
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)
WDFN8
CASE 511AT
7xMG
G
1
SCLK
V
DD
D+
D
THERM
SDATA
ALERT
/
THERM2
GND
1
2
3
4
8
7
6
5
7x = Device Code (Where x = C or D)
M = Date Code
G
= Pb-Free Package
WDFN8
DFN8
(Note: Microdot may be in either location)
发布紧急采购，3分钟左右您将得到回复。
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