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PDF ( 数据手册 , 数据表 ) ADM1023

零件编号 ADM1023
描述 ACPI-Compliant High-Accuracy Microprocessor System Temperature Monitor
制造商 Analog Devices
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ADM1023 数据手册, 描述, 功能
a
ACPI-Compliant
High-Accuracy Microprocessor
System Temperature Monitor
ADM1023*
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.
FUNCTIONAL BLOCK DIAGRAM
ON-CHIP
TEMPERATURE
SENSOR
LOCAL TEMPERATURE
VALUE REGISTER
D+
ANALOG
A-TO-D
D–
MUX
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
STBY
ALERT
NC VDD NC GND GND NC
*Patents pending.
Pentium is a registered trademark of Intel Corporation.
REV. A
NC
NC
NC = NO CONNECT
SDATA
SCLK
ADD0
ADD1
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.
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







ADM1023 pdf, 数据表
ADM1023
Table III. List of ADM1023 Registers
READ Address (Hex) WRITE Address (Hex) Name
Power-On Default
Not Applicable
00
01
02
03
04
05
06
07
08
Not Applicable
10
11
12
13
14
19
20
FE
FF
Not Applicable
Not Applicable
Not Applicable
Not Applicable
09
0A
0B
0C
0D
0E
0F1
Not Applicable
11
12
13
14
Not Applicable
21
Not Applicable
Not Applicable
Address Pointer
Local Temperature Value
Remote Temperature Value High Byte
Status
Conguration
Conversion Rate
Local Temperature High Limit
Local Temperature Low Limit
Remote Temperature High Limit High Byte
Remote Temperature Low Limit High Byte
One-Shot
Remote Temperature Value Low Byte
Remote Temperature Offset High Byte
Remote Temperature Offset Low Byte
Remote Temperature High Limit Low Byte
Remote Temperature Low Limit Low Byte
Reserved
Reserved
Manufacturer Device ID
Die Revision Code
Undened
1000 0000 (80h) (128°C)
1000 0000 (80h) (128°C)
Undened
0000 0000 (00h)
0000 0010 (02h)
0111 1111 (7Fh) (+127°C)
1100 1001 (C9h) (55°C)
0111 1111 (7Fh) (+127°C)
1100 1001 (C9h) (55°C)
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
Undened
0100 0001 (41h)
0011 xxxx (3xh)
NOTE
1Writing to address 0F causes the ADM1023 to perform a single measurement. It is not a data register as such and it does not matter what data is written to it.
Table IV.
Offset Registers
11h 12h
Offset
Value
Remote
Remote
Temperature Temperature
(Including (Without
Offset)
Offset)
1111 1100 0000 0000 4°C
14°C
18°C
1111 1111 0000 0000 1°C
17°C
18°C
1111 1111 1110 0000 0.125°C 17.875°C
18°C
0000 0000 0000 0000 0°C
18°C
18°C
0000 0000 0010 0000 +0.125°C 18.125°C
18°C
0000 0001 0000 0000 +1°C 19°C
18°C
0000 0100 0000 0000 +4°C 22°C
18°C
Status Register
Bit 7 of the Status Register indicates that the ADC is busy con-
verting when it is high. Bits 6 to 3 are flags that indicate the
results of the limit comparisons.
If the local and/or remote temperature measurement is above
the corresponding high temperature limit, or below the corre-
sponding low temperature limit, one or more of these flags will be
set. Bit 2 is a flag that is set if the remote temperature sensor
is open-circuit. These ve flags are NORd together, so that if
any of them are high, the ALERT interrupt latch will be set and
the ALERT output will go low. Reading the Status Register will
clear the ve flag bits, provided the error conditions that caused
the flags to be set have gone away. While a limit comparator
is tripped due to a value register containing an out-of-limit
measurement, or the sensor is open-circuit, the corresponding
flag bit cannot be reset. A flag bit can only be reset if the corre-
sponding value register contains an in-limit measurement, or the
sensor is good.
The ALERT interrupt latch is not reset by reading the Status
Register, but will be reset when the ALERT output has been
serviced by the master reading the device address, provided the
error condition has gone away and the Status Register flag bits
have been reset.
Table V. Status Register Bit Assignments
Bit Name
Function
7 BUSY
1 When ADC Converting.
6 LHIGH* 1 When Local High Temp Limit Tripped.
5 LLOW* 1 When Local Low Temp Limit Tripped.
4 RHIGH* 1 When Remote High Temp Limit Tripped.
3 RLOW* 1 When Remote Low Temp Limit Tripped.
2 OPEN* 1 When Remote Sensor Open-Circuit.
10 Reserved.
*These flags stay high until the status register is read or they are reset by POR.
Configuration Register
Two bits of the conguration register are used. If Bit 6 is 0, which
is the power-on default, the device is in operating mode with the
ADC converting. If Bit 6 is set to 1, the device is in standby mode
and the ADC does not convert. Standby mode can also be selected
by taking the STBY pin low. In standby mode the values of remote
and local temperature remain at the value they were before the
part was placed in standby.
Bit 7 of the conguration register is used to mask the ALERT
output. If Bit 7 is 0, which is the power-on default, the ALERT
output is enabled. If Bit 7 is set to 1, the ALERT output is
disabled.
–8– REV. A














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