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ADM1023 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADM1023
Description  ACPI-Compliant High-Accuracy Microprocessor System Temperature Monitor
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM1023 Datasheet(HTML) 1 Page - Analog Devices

 
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REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
ADM1023*
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
FUNCTIONAL BLOCK DIAGRAM
ACPI-Compliant
High-Accuracy Microprocessor
System Temperature Monitor
FEATURES
Next Generation Upgrade to ADM1021
On-Chip and Remote Temperature Sensing
Offset Registers for System Calibration
1 C Accuracy and Resolution on Local Channel
0.125 C Resolution/1 C Accuracy on Remote Channel
Programmable Over/Under Temperature Limits
Programmable Conversion Rate
Supports System Management Bus (SMBus) Alert
2-Wire SMBus Serial Interface
200
A Max Operating Current (0.25 Conversions/
Seconds)
1
A Standby Current
3 V to 5.5 V Supply
Small 16-Lead QSOP Package
APPLICATIONS
Desktop Computers
Notebook Computers
Smart Batteries
Industrial Controllers
Telecomms Equipment
Instrumentation
PRODUCT DESCRIPTION
The ADM1023 is a two-channel digital thermometer and under/
over temperature alarm, intended for use in personal computers
and other systems requiring thermal monitoring and management.
Optimized for the Pentium
® III; the higher accuracy offered
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-con-
nected PNP transistor, which may be provided on-chip in the
case of 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 tem-
perature of the device and its environment.
The ADM1023 communicates over a 2-wire serial interface
compatible with SMBus standards. Under and over tempera-
ture 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.
*Patents pending.
Pentium is a registered trademark of Intel Corporation.
ON-CHIP
TEMPERATURE
SENSOR
A-TO-D
CONVERTER
BUSY
RUN/STANDBY
EXTERNAL DIODE OPEN-CIRCUIT
ADDRESS POINTER
REGISTER
ONE-SHOT
REGISTER
CONVERSION RATE
REGISTER
OFFSET
REGISTERS
REMOTE TEMPERATURE
HIGH-LIMIT REGISTERS
CONFIGURATION
REGISTER
INTERRUPT
MASKING
SMBUS INTERFACE
LOCAL TEMPERATURE
LOW-LIMIT COMPARATOR
LOCAL TEMPERATURE
HIGH-LIMIT COMPARATOR
REMOTE TEMPERATURE
LOW-LIMIT COMPARATOR
REMOTE TEMPERATURE
HIGH-LIMIT COMPARATOR
REMOTE TEMPERATURE
VALUE REGISTERS
LOCAL TEMPERATURE
VALUE REGISTER
STATUS REGISTER
NC
VDD
GND
NC
GND
NC
NC
NC
SDATA
SCLK
ADD0
ADD1
ALERT
STBY
D+
D–
REMOTE TEMPERATURE
LOW-LIMIT REGISTERS
LOCAL TEMPERATURE
HIGH-LIMIT REGISTER
LOCAL TEMPERATURE
LOW-LIMIT REGISTER
ANALOG
MUX
NC = NO CONNECT
ADM1023


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