SDA

SCL

A0

A1

A2

V

S

GND

ALERT

I

N x I

Thermal

BJT

ADC

Control Logic

Device

Register Bank

Serial Interface

Oscillator

Voltage Regulator

TMP75C

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SBOS707B – APRIL 2014 – REVISED AUGUST 2014

7 Detailed Description

7.1 Overview

The TMP75C is a digital temperature sensor optimal for thermal management and thermal protection

applications. The TMP75C is two-wire and SMBus interface compatible, and is specified over a temperature

range of –55°C to +125°C.

The temperature sensing device for the TMP75C is the chip itself. A bipolar junction transistor (BJT) inside the

chip is used in a band-gap configuration to produce a voltage proportional to the chip temperature. The voltage is

digitized and converted to a 12-bit temperature result in degrees Celsius, with resolution of 0.0625°C. The

package leads provide the primary thermal path because of the lower thermal resistance of the metal. Thus, the

temperature result is equivalent to the local temperature of the printed circuit board (PCB) where the sensor is

mounted.

7.2 Functional Block Diagram

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