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ADT7483A Datasheet(PDF) 1 Page - Analog Devices

Part No. ADT7483A
Description  Dual Channel Temperature Sensor and Over Temperature Alarm
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADT7483A Datasheet(HTML) 1 Page - Analog Devices

 
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Dual Channel Temperature Sensor
and Over Temperature Alarm
ADT7483A
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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.
FEATURES
1 local and 2 remote temperature sensors
0.25°C resolution/1°C accuracy on remote channels
1°C resolution/1°C accuracy on local channel
Extended, switchable temperature measurement range
0°C to 127°C (default) or –64°C to +191°C
2-wire SMBus serial interface with SMBus alert support
Programmable over/under temperature limits
Offset registers for system calibration
Up to 2 overtemperature fail-safe THERM outputs
Small 16-lead QSOP package
240 μA operating current, 5 μA standby current
APPLICATIONS
Desktop and notebook computers
Industrial controllers
Smart batteries
Automotive
Embedded systems
Burn-in applications
Instrumentation
GENERAL DESCRIPTION
The ADT7483A1 is a three-channel digital thermometer and
under/over temperature alarm, intended for use in PCs and
thermal management systems. It can measure the temperature
in two remote locations, for example, the remote thermal diode
in a CPU or GPU, or a discrete diode connected transistor. It can
also measure its own ambient temperature. The temperature of the
remote thermal diode and ambient temperature can be accurately
measured to ±1°C. The temperature measurement range defaults to
0°C to 127°C, compatible with ADM1032, but can be switched
to a wider measurement range, from −64°C to +191°C.
The ADT7483A communicates over a 2-wire serial interface
compatible with system management bus (SMBus) standards.
The SMBus address is set by the ADD0 and ADD1 pins. As
many as nine different SMBus addresses are possible.
An ALERT output signals when the on-chip or remote
temperature is outside the programmed limits. The THERM
output is a comparator output that allows, for example, on/off
control of a cooling fan. The ALERT output can be reconfigured
as a second THERM output, if required.
FUNCTIONAL BLOCK DIAGRAM
11-BIT A-TO-D
CONVERTER
RUN/STANDBY
BUSY
REMOTE 1 AND 2 TEMP
OFFSET REGISTERS
STATUS REGISTERS
INTERRUPT
MASKING
CONFIGURATION
REGISTERS
REMOTE 1 AND 2 TEMP
HIGH LIMIT REGISTERS
REMOTE 1 AND 2 TEMP
LOW LIMIT REGISTERS
REMOTE 1 AND 2 TEMP
THERM LIMIT REGISTER
LOCAL TEMPERATURE
HIGH LIMIT REGISTER
LOCAL TEMPERATURE
LOW LIMIT REGISTER
LOCAL TEMPERATURE
THERM LIMIT REGISTER
ONE-SHOT
REGISTER
ADDRESS POINTER
REGISTER
CONVERSION RATE
REGISTER
REMOTE 1 AND 2 TEMP
VALUE REGISTERS
LOCAL TEMPERATURE
VALUE REGISTER
ON-CHIP TEMP
SENSOR
ANALOG
MUX
EXTERNAL DIODES OPEN-CIRCUIT
SMBus INTERFACE
ADT7483A
12
11
4
3
15
5
2
6
14
VDD
GND
SDATA SCLK
THERM
13
D1+
D1–
D2+
D2–
ALERT/THERM2
1
16
ADD0
ADD1
Figure 1.
1 Protected 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.


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