ADM1032

Manufacturer Part NumberADM1032
ManufacturerON Semiconductor
ADM1032 datasheet
 
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FEATURES
On-chip and remote temperature sensing
Offset registers for system calibration
0.125°C resolution/1°C accuracy on remote channel
1°C resolution/3°C accuracy on local channel
Fast (up to 64 measurements per second)
2-wire SMBus serial interface
Supports SMBus alert
Programmable under/overtemperature limits
Programmable fault queue
Overtemperature fail-safe THERM output
Programmable THERM limits
Programmable THERM hysteresis
170 μA operating current
5.5 μA standby current
3 V to 5.5 V supply
Small 8-lead SOIC and MSOP packages
APPLICATIONS
Desktop and notebook computers
Smart batteries
Industrial controllers
Telecommunications equipment
Instrumentation
Embedded systems
ON-CHIP
TEMPERATURE
SENSOR
LOCAL TEMPERATURE
VALUE REGISTER
D+
ANALOG
A/D
MUX
CONVERTER
D–
BUSY
RUN/STANDBY
EXTERNAL DIODE OPEN-CIRCUIT
ADM1032
V
GND
DD
©2008 SCILLC. All rights reserved.
January 2008 – Rev. 6
±1°C Remote and Local System
GENERAL DESCRIPTION
The ADM1032
under/overtemperature alarm intended for use in PCs and
thermal management systems. The device can measure the
temperature of a remote thermal diode, which can be located
on the processor die or can be a discrete device (2N3904/06),
accurate to 1°C. A novel measurement technique cancels out
the absolute value of the transistor’s base emitter voltage so that
no calibration is required. The ADM1032 also measures its
ambient temperature.
The ADM1032 communicates over a 2-wire serial interface
compatible with system management bus (SMBus) standards.
Under/overtemperature limits can be programmed into the
device over the SMBus, and an ALERT output signals when the
on-chip or remote temperature measurement is out of range.
This output can be used as an interrupt or as a SMBus alert. The
THERM output is a comparator output that allows CPU clock
throttling or on/off control of a cooling fan. An ADM1032-1 and
ADM1032-2 are available. The difference between the
ADM1032 and theADM1032-1 is the default value of the
external THERM limit. The ADM1032-2 has a different
SMBus address. The SMBus address of theADM1032-2 is 0x4D.
1
Patents 5,982,221; 6,097,239; 6,133,753; 6,169,442; 5,867,012.
FUNCTIONAL BLOCK DIAGRAM
LIMIT
COMPARATOR
REMOTE TEMPERATURE
VALUE REGISTER
REMOTE OFFSET
REGISTER
STATUS REGISTER
SMBUS INTERFACE
Figure 1.
Temperature Monitor
ADM1032
1
is a dual-channel digital thermometer and
ADDRESS POINTER
REGISTER
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
LOW LIMIT REGISTER
LOCAL TEMPERATURE
HIGH LIMIT REGISTER
REMOTE TEMPERATURE
LOW LIMIT REGISTER
REMOTE TEMPERATURE
HIGH LIMIT REGISTER
LOCAL THERM LIMIT
REGISTER
EXTERNAL THERM LIMIT
REGISTER
CONFIGURATION
REGISTER
INTERRUPT
ALERT
MASKING
THERM
SDATA
SCLK
Publication Order Number:
ADM1032/D

ADM1032 Summary of contents