ADM1021A Datasheet PDF - Analog Devices
| Part Number | ADM1021A | |
| Description | System Temperature Monitor Microcomputer | |
| Manufacturers | Analog Devices | |
| Logo |  |
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Low Cost Microprocessor,
System Temperature Monitor Microcomputer
ADM1021A
FEATURES
PRODUCT DESCRIPTION
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 overtemperature/undertemperature
limits
Programmable conversion rate
2-wire SMBus serial interface
Supports system management bus (SMBus) alert
200 μA max operating current
1 μA standby current
3 V to 5.5 V supply
Small 16-lead QSOP package
APPLICATIONS
Desktop computers
Notebook computers
Smart batteries
Industrial controllers
Telecom equipment
Instrumentation
The ADM1021A1 is a two-channel digital thermometer and
undertemperature/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. Undertemperature and
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.
FUNCTIONAL BLOCK DIAGRAM
ON-CHIP
TEMPERATURE
SENSOR
LOCAL TEMPERATURE
VALUE REGISTER
D+ 3
D– 4
ANALOG MUX
A-TO-D
CONVERTER
BUSY
RUN/STANDBY
REMOTE TEMPERATURE
VALUE REGISTER
EXTERNAL DIODE OPEN-CIRCUIT
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
LOCAL TEMPERATURE
LOW LIMIT REGISTER
LOCAL TEMPERATURE
HIGH LIMIT REGISTER
REMOTE TEMPERATURE
LOW LIMIT REGISTER
REMOTE TEMPERATURE
HIGH LIMIT REGISTER
CONFIGURATION
REGISTER
INTERRUPT
MASKING
15 STBY
11 ALERT
ADM1021A
SMBUS INTERFACE
125789
NC VDD NC GND GND NC
13
NC
16
NC
12
SDATA
14
SCLK
10
ADD0
6
ADD1
Figure 1.
1Protected by U.S. Patents 5,195,827; 5,867,012; 5,982,221; 6,097,239; 6,133,753; 6,169,442; other patents pending.
NC = NO CONNECT
Rev. F
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 that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
NC 1
VDD 2
D+ 3
D– 4
NC 5
ADD1 6
GND 7
GND 8
16 NC
15 STBY
ADM1021A
TOP VIEW
(Not to Scale)
14 SCLK
13 NC
12 SDATA
11 ALERT
10 ADD0
9 NC
NC = NO CONNECT
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
1, 5, 9, 13, 16
NC
2 VDD
3 D+
4 D−
6 ADD1
7, 8 GND
10 ADD0
11 ALERT
12 SDATA
14 SCLK
15 STBY
Description
No Connect.
Positive Supply, 3 V to 5.5 V.
Positive Connection to Remote Temperature Sensor.
Negative Connection to Remote Temperature Sensor.
Three-State Logic Input, Higher Bit of Device Address.
Supply 0 V Connection.
Three-State Logic Input, Lower Bit of Device Address.
Open-Drain Logic Output Used as Interrupt or SMBus Alert.
Logic Input/Output, SMBus Serial Data. Open-Drain Output.
Logic Input, SMBus Serial Clock.
Logic Input Selecting Normal Operation (High) or Standby Mode (Low).
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
ADM1021A
SCL
tLOW
tHD;STA
SDA
tBUF
PS
tR tF
tHD;DAT
tHIGH
tSU;DAT
tHD;STA
tSU;STA
S
Figure 3. Diagram for Serial Bus Timing
tSU;STO
P
Rev. F | Page 5 of 20
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| Information | Total 20 Pages | |
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