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ADM1021AARQZ-R Datasheet(PDF) 1 Page - ON Semiconductor

Part No. ADM1021AARQZ-R
Description  Low Cost Microprocessor System Temperature Monitor Microcomputer
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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ADM1021AARQZ-R Datasheet(HTML) 1 Page - ON Semiconductor

 
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© Semiconductor Components Industries, LLC, 2010
June, 2010 − Rev. 8
1
Publication Order Number:
ADM1021A/D
ADM1021A
Low Cost Microprocessor
System Temperature
Monitor Microcomputer
The ADM1021A is a two−channel digital thermometer and
under/overtemperature alarm, intended for use in personal computers
and other systems requiring thermal monitoring and management. The
device can measure the temperature of a microprocessor using a
diode−connected PNP transistor, which can be provided on−chip with
the Pentium
® III or similar processors, or can be a low cost discrete
NPN/PNP device, such as the 2N3904/2N3906. A novel measurement
technique cancels out the absolute value of the transistor’s base emitter
voltage so that no calibration is required. The second measurement
channel measures the output of an on−chip temperature sensor to
monitor the temperature of the device and its environment.
The ADM1021A communicates over a two−wire serial interface
compatible with SMBus standards. Under/overtemperature limits can
be programmed into the device over the serial bus, and an ALERT
output signals when the on−chip or remote temperature is out of range.
This output can be used as an interrupt or as an SMBus alert.
FEATURES
Alternative to the ADM1021
On−Chip and Remote Temperature Sensing
No Calibration Necessary
1°C Accuracy for On−Chip Sensor
3°C Accuracy for Remote Sensor
Programmable Over/Undertemperature Limits
Programmable Conversion rate
2−Wire SMBus Serial Interface
Supports System Management Bus (SMBus) Alert
200 mA Max Operating Current
1 mA Standby Current
3.0 V to 5.5 V Supply
Small 16−Lead QSOP Package
APPLICATIONS
Desktop Computers
Notebook Computers
Smart Batteries
Industrial Controllers
Telecom Equipment
Instrumentation
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
ORDERING INFORMATION
xxx
= Device Code
#
= Pb−Free Package
YYWW = Date Code
MARKING DIAGRAM
1
QSOP−16
CASE 492
1021AA
RQZ
#YYWW
1
2
3
4
5
6
7
8
ADM1021A
TOP VIEW
14
13
12
11
10
9
VDD
D+
D–
GND
ADD1
NC
NC
ADD0
GND
NC
ALERT
SDATA
NC
16
15
NC
STBY
SCLK
PIN ASSIGNMENT


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