The ADT74821 is a three-channel digital thermometer and undertemperature/overtemperature alarm for PCs and thermal management systems. It can measure the temperature in two remote locations, such as in the remote thermal diode in a CPU or GPU, or using a discrete diode connected transistor. This device also measures its own ambient temperature.
APPLICATIONS Desktop and notebook computers Industrial controllers Smart batteries Automotive Embedded systems Burn-in applications Instrumentation
Feature
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 Automatically cancels up to 1.5 kΩ (typ) of resistance in series with the remote sensors Extended, switchable temperature measurement range 0°C to +127°C (default) or −55°C to +150°C 2-wire SMBus serial interface with SMBus alert support Programmable overtemperature/undertemperature limits Offset registers for system calibration Up to 2 overtemperature fail-safe THERM outputs Small, 10-lead MSOP package 240 μA operating current, 5 μA standby current
