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1 Features

? Supply range: 3 V to 5.5 V

? Wide operating range: –40°C to 125°C

? Remote channel accuracy: 1°C

– Resolution: 0.125°C

? Local channel accuracy: 1°C

– Resolution: 1°C

? Support I2C and SMBus interface

? Low power consumption

? Remote diode fault detection

? Programmable digital filter

? Series resistance cancellation

? Programmable ALERT and T_CRIT limits

– Fault queue for debounce

? Adjustable default power-up limits (high

temperature) for ALERT and T_CRIT

? 1.2-V logic compatible input thresholds

independent of supply

2 Applications

? Standard notebook PC

? Rack server motherboard

? Smart network interface card (NIC)

? Small cell base station

? Baseband unit (BBU)

? Software defined radio

? FPGA Temperature Monitoring

3 Description

The TMP4718 is a high accuracy 1°C temperature

sensor with one local integrated sensor and a remote

temperature sensor input that can be connected to

a diode-connected transistor, such as the popular

MMBT3904 NPN transistor, to replace traditional

thermistors or thermocouples. The remote input

can also be connected to a substrate thermal

transistor or diode integrated inside microprocessors,

microcontrollers, or FPGAs to monitor the die

temperature of the IC.

The TMP4718 supports I2C and SMBus

communication, with 1.2-V logic compatible inputs

that support 0.8-V thresholds regardless of the main

supply. The TMP4718 includes the Series Resistance

Cancellation feature to automatically eliminate

temperature errors caused by series resistance of

up to 1 kΩ, allowing for greater flexibility routing

to thermal diodes. The programmable offset feature

allows the device to report adjusted offset-adjusted

temperature data based on pre-calibrated data in

specific user environments. Measurements can be

done automatically with programmable conversion

period, or with one-shot conversion triggered by an

I2C command.

The TMP4718A and TMP4718B offer the same

function but different SMBus or I2C device addresses.

This allows the system to support more than two

sensors on the same bus.