1 Features
1• ±1°C Accuracy for Local and Remote Diode
Sensors
• 0.0625°C Resolution for Local and Remote
Channels
• 1.7-V to 3.6-V Supply and Logic Voltage Range
• 27-μA Operating Current, 3-μA Shutdown Current
• Series Resistance Cancellation
• η-Factor and Offset Correction
• Programmable Digital Filter
• Diode Fault Detection
• Two-Wire and SMBus™ Serial Interface
• 8-Lead WSON (WDFN) Package

2 Applications
• Processor and FPGA Temperature Monitoring
• Smart Phones and Tablets
• Servers, Desktops, and Notebooks
• Telecom Equipment and Storage Area Networks
(SANs)

3 Description
The TMP451 device is a high-accuracy, low-power
remote temperature sensor monitor with a built-in
local temperature sensor. The remote temperature
sensors are typically low-cost discrete NPN or PNP
transistors, or substrate thermal transistors or diodes
that are integral parts of microprocessors,
microcontrollers, or FPGAs. The temperature is
represented as a 12-bit digital code for both the local
and remote sensors, giving a resolution of 0.0625°C.
The temperature accuracy is ±1°C (maximum) in the
typical operating range for the local and the remote
temperature sensors. The two-wire serial interface accepts the SMBus communication protocol.
Advanced features such as series resistance cancellation, programmable nonideality factor (η-
factor), programmable offset, programmable
temperature limits, and a programmable digital filter
are combined to provide a robust thermal monitoring
solution with improved accuracy and noise immunity.
The TMP451 device is ideal for high-accuracy
temperature measurements in multiple locations and in a variety of automotive subsystems. The device is
specified for operation over a supply voltage range of
1.7 V to 3.6 V and a temperature range of –40°C to
125°C.