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  ON Semiconductor Electronic Components Datasheet  

ADT7421 Datasheet

Temperature Sensor W/ Beta Correction

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ADT7421 pdf
ADT7421
Precision Temperature
Sensor with Beta
Compensationwww.datasheet4u.com
(for <45nm geometries)
The ADT7421 is a dualchannel digital thermometer and
undertemperature/overtemperature alarm, intended for use in PCs and
thermal management systems. It is pinand registercompatible with
the ADM1032, ADT7461 and ADT7461A.
The ADT7421 includes Beta Cancellation Technology. This enables
accurate measurement of temperature from very small geometry
(45nm) processes. Significant variations in the Beta factor can be
observed when different currents are applied to transistors embedded
in small geometry CPU’s. This leads to large temperature errors. The
ADT7421 automatically cancels the effects of error induced by beta
variations.
Features
OnChip and Remote Temperature Sensor
0.25°C Resolution on Remote Channel
1°C Resolution on Local Channel
Automatically Cancels the Effect of Beta Variation in Thermal
Transistors on Small Geometry CPU’s
Automatically Cancels Up to 50 W (Typical) of Resistance in Series
with Remote Transistor
Extended, Switchable Temperature Measurement Range
0°C to +125°C (default) or 40°C to +125°C
Pinand RegisterCompatible with ADM1032, ADT7461,
ADT7461A, EMC1402, and aSC7525
2Wire SMBus Serial Interface with SMBus Alert Support
Programmable Over/Undertemperature Limits
Offset Registers for System Calibration
Up to Two Overtemperature FailSafe THERM Outputs
Small 8lead MSOP and SOP Packages
Applications
Desktop and Notebook Computers
Industrial Controllers
Smart Batteries
Automotive
Embedded Systems
BurnIn Applications
Instrumentation
http://onsemi.com
MARKING
DIAGRAMS
8
1 SOIC8
CASE 751
8
T7421
ALYWR
#
1
1 MSOP8
CASE 846AB
8
L
xx
1
(Top)
#YWW
ZZZZ
(Bottom)
xx = 75 or 76
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
ZZ = Assembly Lot Information
# = PbFree Package
PIN ASSIGNMENT
VDD
D+
D–
1
2
3
THERM 4
8 SCLK
7 SDATA
6 ALERT/THERM2
5 GND
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 20 of this data sheet.
© Semiconductor Components Industries, LLC, 2008
November, 2008 Rev. 1
1
Publication Order Number:
ADT7421/D


  ON Semiconductor Electronic Components Datasheet  

ADT7421 Datasheet

Temperature Sensor W/ Beta Correction

No Preview Available !

ADT7421 pdf
ADT7421
Another feature of the ADT7421 is Series Resistance
Cancellation, where up to 50 W (typical) of resistance in
series with the temperaturemonitoring transistor can be
automatically cancelled from the temperature result,
allowing noise filtering.
The combination of Beta cancellation and series
resistance cancellation provides critical high accuracy
www.datatesmhepeet4raut.ucoremsensing on 45nm CPU’s and GPU’s.
The ADT7421 can measure the temperature of a remote
thermal transistor accurate to ±1°C and the ambient
temperature accurate to ±1°C. The temperature measurement
range defaults to 0°C to +125°C, compatible with the
ADM1032, but it can be switched to a wider measurement
range of 40°C to +125°C.
The ADT7421 has a configurable ALERT output and an
extended, switchable temperature measurement range.
The ADT7421 communicates over a 2wire serial
interface, compatible with system management bus
(SMBus) standards. The default SMBus address of the
ADT7421 is 0x4C. An ADT74212 is available with a
SMBus address of 0x4D. This is useful if more than one
ADT7421 is used on the same SMBus.
An ALERT output signals when the onchip 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.
ONCHIP
TEMPERATURE
SENSOR
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
VALUE REGISTER
D+ 2
D– 3
ANALOG
MUX
ATOD
CONVERTER
BUSY
RUN/STANDBY
REMOTE TEMPERATURE
VALUE REGISTER
REMOTE OFFSET
REGISTER
EXTERNAL DIODE OPENCIRCUIT
ADT7421
1
VDD
5
GND
STATUS REGISTER
ADDRESS POINTER
REGISTER
LOCAL TEMPERATURE
LOWLIMIT REGISTER
LOCAL TEMPERATURE
HIGHLIMIT REGISTER
REMOTE TEMPERATURE
LOWLIMIT REGISTER
REMOTE TEMPERATURE
HIGHLIMIT REGISTER
LOCAL THERM LIMIT
REGISTERS
EXTERNAL THERM LIMIT
REGISTERS
CONFIGURATION
REGISTERS
INTERRUPT
MASKING
SMBus INTERFACE
7
SDATA
8
SCLK
Figure 1. Block Diagram
6 ALERT/THERM2
4 THERM
http://onsemi.com
2


Part Number ADT7421
Description Temperature Sensor W/ Beta Correction
Maker ON Semiconductor
Total Page 22 Pages
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