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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
http://onsemi.com
QSOP 16
CASE 492
PIN ASSIGNMENT
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.
NC
V DD
D+
1
2
3
16
15
14
NC
STBY
SCLK
Features
D ?
4
ADM1021A
13
NC
?
?
?
?
?
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
NC
ADD1
GND
GND
5
6
7
8
(Top View)
12
11
10
9
SDATA
ALERT
ADD0
NC
?
?
?
?
?
?
?
?
?
Programmable Over/Undertemperature Limits
Programmable Conversion rate
2-wire SMBus Serial Interface
Supports System Management Bus (SMBus) Alert
200 m A Max Operating Current
1 m A Standby Current
3.0 V to 5.5 V Supply
Small 16-lead QSOP Package
This Device is Pb-Free, Halogen Free and is RoHS Compliant
NC = No Connect
MARKING DIAGRAM
1021AA
RQZ
YYWWG
Applications
1021AARQZ
= Specific Device Code
?
?
?
Desktop Computers
Notebook Computers
Smart Batteries
YY
WW
G
= Year
= Work Week
= Pb-Free Package
?
?
?
Industrial Controllers
Telecom Equipment
Instrumentation
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
? Semiconductor Components Industries, LLC, 2012
July, 2012 ? Rev. 9
1
Publication Order Number:
ADM1021A/D
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