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.