The ADT7483A 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.

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 A Operating Current, 5 A Standby Current
 This Device is Pb-Free, Halogen Free and is RoHS Compliant

Applications
 Desktop and Notebook Computers
 Industrial Controllers
 Smart Batteries
 Automotive
 Embedded Systems
 Burn-in Applications
 Instrumentation