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ON Semiconductor |
ADM1023
ACPI‐Compliant, High
Accuracy Microprocessor
System Temperature Monitor
The ADM1023 is a 2-channel digital thermometer and
under/overtemperature alarm for use in personal computers and other
systems requiring thermal monitoring and management. Optimized
for the Pentium III, the higher accuracy allows systems designers to
safely reduce temperature guard banding and increase system
performance. The device can measure the temperature of a
microprocessor using a diode-connected PNP transistor, which may be
provided on-chip with the Pentium III or similar processors; or it 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 ADM1023 communicates over a 2-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
Next Generation Upgrade of ADM1021
On-Chip and Remote Temperature Sensing
Offset Registers for System Calibration
1C Accuracy and Resolution on Local Channel
0.125C Resolution/1C Accuracy on Remote Channel
Programmable Over/Undertemperature Limits
Programmable Conversion Rate
Supports System Management Bus (SMBus) ALERT
2-Wire SMBus Serial Interface
200 mA Max Operating Current (0.25 Conversions/Second)
1 mA Standby Current
3.0 V to 5.5 V Supply
Small 16-Lead QSOP Package
This is a Pb-Free Package*
Applications
Desktop Computers
Notebook Computers
Smart Batteries
Industrial Controllers
Telecomm Equipment
Instrumentation
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
Semiconductor Components Industries, LLC, 2012
April, 2012 − Rev. 10
1
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QSOP 16
CASE 492
PIN ASSIGNMENT
NC 1
VDD 2
D+ 3
D− 4
NC 5
ADD1 6
GND 7
GND 8
16 NC
15 STBY
14 SCLK
13 NC
12 SDATA
11 ALERT
10 ADD0
9 NC
ADM1023
(Top View)
MARKING DIAGRAM
1023A
RQZ
YYWWG
1023ARQZ
YY
WW
G
= Specific Device Code
= Year
= Work Week
= Pb-Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
Publication Order Number:
ADM1023/D
ADM1023
ON−CHIP
TEMPERATURE
SENSOR
LOCAL TEMPERATURE
VALUE REGISTER
D+ 3
D– 4
ANALOG
MUX
A−TO−D
CONVERTER
BUSY
RUN/STANDBY
REMOTE TEMPERATURE
VALUE REGISTERS
EXTERNAL DIODE OPEN−CIRCUIT
ADM1023
LOCAL TEMPERATURE
LOW−LIMIT COMPARATOR
LOCAL TEMPERATURE
HIGH−LIMIT COMPARATOR
REMOTE TEMPERATURE
LOW−LIMIT COMPARATOR
REMOTE TEMPERATURE
HIGH−LIMIT COMPARATOR
STATUS REGISTER
ADDRESS POINTER
REGISTER
ONE−SHOT
REGISTER
CONVERSION RATE
REGISTER
OFFSET
REGISTERS
LOCAL TEMPERATURE
LOW−LIMIT REGISTER
LOCAL TEMPERATURE
HIGH−LIMIT REGISTER
REMOTE TEMPERATURE
LOW−LIMIT REGISTERS
REMOTE TEMPERATURE
HIGH−LIMIT REGISTERS
CONFIGURATION
REGISTER
INTERRUPT
MASKING
SMBus INTERFACE
1257
NC VDD NC GND
NC = NO CONNECT
8
GND
9
NC
13 16
NC NC
12
SDATA
14
SCLK
10
ADD0
Figure 1. Functional Block Diagram
6
ADD1
15 STBY
11 ALERT
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
Positive Supply Voltage (VDD) to GND
D+, ADD0, ADD1
D− to GND
−0.3 to +6.0
−0.3 to VDD + 0.3
−0.3 to +0.6
V
V
SCLK, SDATA, ALERT, STBY
−0.3 to +6.0
V
Input Current
50 mA
Input Current, D−
10 mA
ESD Rating, All Pins (Human Body Model)
2000
V
Continuous Power Dissipation
Up to 70C
Derating Above 70C
650 mW
6.7 mW/C
Operating Temperature Range
−55 to +125
C
Maximum Junction Temperature (TJmax)
Storage Temperature Range
150
−65 to +150
C
C
Lead Temperature, Soldering (10 s)
300 C
IR Reflow Peak Temperature
220 C
IR Reflow Peak Temperature for Pb-Free
260 C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
NOTE: This device is ESD sensitive. Use standard ESD precautions when handling.
Table 2. THERMAL CHARACTERISTICS
Parameter
16-Lead QSOP Package
Rating
qJA = 105C/W, qJC = 39C/W
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