ADM1021AARQZ-R View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
ADM1021AARQZ-R Datasheet PDF : 15 Pages
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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
QSOP−16
CASE 492
MARKING DIAGRAM
1
1021AA
RQZ
#YYWW
xxx = Device Code
#
= Pb−Free Package
YYWW = Date Code
PIN ASSIGNMENT
NC 1
VDD 2
D+ 3
D– 4
NC 5
ADD1 6
GND 7
GND 8
16 NC
15 STBY
14 SCLK
ADM1021A 13 NC
TOP VIEW 12 SDATA
11 ALERT
10 ADD0
9 NC
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
© Semiconductor Components Industries, LLC, 2010
1
June, 2010 − Rev. 8
Publication Order Number:
ADM1021A/D
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