1 Features
1• ±1°C Remote Diode Sensor
• ±3°C Local Temperature Sensor
• Series Resistance Cancellation
• THERM Flag Output
• ALERT/THERM2 Flag Output
• Programmable Over- and Undertemperature
Limits
• Programmable Resolution: 9- to 12-Bit
• Diode Fault Detection
• SMBus-Compatible

2 Applications
• Servers and Workstations
• Desktop and Notebook Computers
• Telecom and Network Infrastructure
• Set Top Boxes

3 Description
The TMP401 is a remote temperature sensor monitor
with a built-in local temperature sensor. The remote sensor is capable of monitoring the temperature of
any external PN junction. Typical sense elements
include low-cost NPN- or PNP-type transistors and
diodes, or accessible thermal diodes integrated within microcontrollers, microprocessors, or field-
programmable gate arrays (FPGAs).
The accuracy of the remote sensor is ±1°C for multiple IC manufacturers, with no calibration needed.
The two-wire serial interface accepts SMBus write
byte, read byte, send byte, and receive byte
commands to program alarm thresholds and to read
temperature data.
Features included in the TMP401 are series
resistance cancellation, wide remote temperature measurement range (up to +150°C), diode fault
detection, and temperature alert functions.