Temperature

Sensor

Circuitry

Control

Logic

Temperature

Register

Manufacturer's

ID Register

Three-Wire

Serial Interface

14-Bit

Delta-Sigma

A/D Converter

SI/O

SC

VDD

LM95071/

LM95071-Q1

CS

9

LM95071

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SNIS137G – AUGUST 2004 – REVISED AUGUST 2019

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8 Detailed Description

8.1 Overview

The LM95071 temperature sensor incorporates a temperature sensor and 13-bit-plus-sign ΔΣ ADC (Delta-Sigma

Analog-to-Digital Converter). Compatibility of the LM95071's three-wire serial interface with SPI and

MICROWIRE allows simple communications with common microcontrollers and processors. Shutdown mode can

be used to optimize current drain for different applications. A Manufacturer/Device ID register identifies the

LM95071 as a Texas Instruments product.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Power Up and Power Down

The LM95071 always powers up in a known state and in the continuous conversion mode. Immediately after

power up, the LM95071 will output an erroneous code until the first temperature conversion has completed.

When the supply voltage is less than about 1.6V (typical), the LM95071 is considered powered down. As the

supply voltage rises above the nominal 1.6-V power up threshold, the internal registers are reset to the power up

default state described above.

8.3.2 Temperature Data Format

Temperature data is represented by a 14-bit, two's complement word with an LSB (Least Significant Bit) equal to

0.03125°C:

Table 1. Digital Output for Temperature Data

Temperature

Digital Output

Binary

Hex

+150°C

0100 1011 0000 0011

4B03

+125°C

0011 1110 1000 0011

3E83

+25°C

0000 1100 1000 0011

0C83

+0.03125°C

0000 0000 0000 0111

0007

0°C

0000 0000 0000 0011

0003