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ADT7481 Datasheet, PDF (1/20 Pages) Analog Devices – Dual Channel Temperature Sensor and Over Temperature Alarm | |||
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ADT7481
Dual Channel Temperature
Sensor and Overtemperature
Alarm
The ADT7481 is a 3âchannel digital thermometer and under/ over
temperature alarm, intended for use in PCs and thermal management
systems. It can measure its own ambient temperature or the
temperature of two remote thermal diodes. These thermal diodes can
be located in a CPU or GPU, or they can be discrete diode connected
transistors. The ambient temperature, or the temperature of the remote
thermal diode, 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
â64°C to +191°C.
The ADT7481 communicates over a 2âwire serial interface
compatible with System Management Bus (SMBus) standards. The
SMBus address of the ADT7481 is 0x4C. An ADT7481â1 with an
SMBus address of 0x4B is also available.
An ALERT output signals when the onâchip 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.
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 â64°C to +191°C
⢠2âWire SMBus Serial Interface with SMBus ALERT Support
⢠Programmable Over/Undertemperature Limits
⢠Offset Registers for System Calibration
⢠Up to 2 Overtemperature FailâSafe THERM Outputs
⢠Small 10âLead MSOP Package
⢠240 mA Operating Current, 5 mA Standby Current
⢠These are PbâFree Devices
Applications
⢠Desktop and Notebook Computers
⢠Industrial Controllers
⢠Smart Batteries
⢠Automotive
⢠Embedded Systems
⢠BurnâIn Applications
⢠Instrumentation
http://onsemi.com
MSOPâ10
CASE 846AC
1
MARKING DIAGRAM
10
T0x
AYWG
G
1
T0x = Refer to Ordering Info Table
A = Assembly Location
Y = Year
W = Work Week
G = PbâFree Package
(Note: Microdot may be in either location)
PIN ASSIGNMENT
VDD 1
D1+ 2
D1â 3
THERM 4
GND 5
ADT7481
10 SCLK
9 SDATA
8 ALERT/THERM2
7 D2+
6 D2â
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 19 of this data sheet.
© Semiconductor Components Industries, LLC, 2010
1
June, 2010 â Rev. 5
Publication Order Number:
ADT7481/D
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