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-Q1

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SNIS207 – DECEMBER 2018

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8 Detailed Description

8.1 Overview

The LM95071-Q1 temperature sensor incorporates a temperature sensor and 13-bit-plus-sign ΔΣ ADC (Delta-

Sigma Analog-to-Digital Converter). Compatibility of the LM95071-Q1'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-Q1 as a Texas Instruments product.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Power Up and Power Down

The LM95071-Q1 always powers up in a known state and in the continuous conversion mode. Immediately after

power up, the LM95071-Q1 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-Q1 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