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

2.65V to 5.5V

LM71

CS

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM71, LM71-Q1

SNIS125E – MARCH 2004 – REVISED AUGUST 2018

LM71/LM71-Q1 SPI/MICROWIRE 13-Bit Plus Sign Temperature Sensor

1

1 Features

1

•

LM71Q is AEC-Q100 Grade 0 Qualified and is

Manufactured on an Automotive Grade Flow

•

5-Pin SOT-23 Package or 6-Pin No-Pull-Back

WSON Package

•

Operates Over a Full

−40°C to +150°C Range

•

SPI and MICROWIRE Bus Interface

•

Key Specifications:

–

Supply Voltage: 2.65V to 5.5V

–

Supply Current

–

Operating: 300 µA (typ)

–

550 µA (max)

–

Temperature Accuracy

–

−10°C to +65°C: ±1.5°C (max)

–

−40°C to 150°C: +3/− 2°C (max)

–

Temperature Resolution: 31.25 m°C

2 Applications

•

System Thermal Management

•

Personal Computers

•

Portable Electronic Devices

•

Disk Drives

•

Office Electronics

•

Electronic Test Equipment

•

Vending Machines

•

Automotive

3 Description

The LM71 is a low-power, high-resolution digital

temperature sensor with an SPI and MICROWIRE

compatible interface, available in the 5-pin SOT-23 or

the 6-pin WSON (no pull back) package. The host

can query the LM71 at any time to read temperature.

Its low operating current is useful in systems where

low power consumption is critical.

The LM71 has 13-bit plus sign temperature resolution

(0.03125°C

per

LSB)

while

operating

over

a

temperature range of

−40°C to +150°C.

The LM71’s 2.65V to 5.5V supply voltage range, fast

conversion rate, low supply current, and simple SPI

interface

make

it

ideal

for

a

wide

range

of

applications. The LM71Q is available in the 5-lead

SOT-23 package only.

Simplified Block Diagram