13-Bit, ±0.5°C Accurate, MicroPower Digital

Temperature Sensor in 6-Lead SOT-23

Preliminary Technical Data

ADT7301

Rev. PrJ

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FEATURES

13-bit temperature-to-digital converter

−40°C to +150°C operating temperature range

±0.5°C typical accuracy

0.03125°C temperature resolution

Shutdown current of 1 µA

SPI- and DSP-compatible serial interface

Shutdown mode

Space-saving SOT-23 and MSOP packages

APPLICATIONS

Medical equipment

Automotive:

Environmental controls

Oil temperature

Hydraulic systems

Cell phones

Hard disk drives

Personal computers

Electronic test equipment

Office equipment

Domestic appliances

Process control

FUNCTIONAL BLOCK DIAGRAM

SERIAL

BUS

INTERFACE

ADT7301

SCLK

DIN

DOUT

GND

13-BIT

ANALOG/DIGITAL

CONVERTER

TEMPERATURE

VALUE

REGISTER

BAND GAP

TEMPERATURE

SENSOR

CS

Figure 1. Functional Block Diagram

GENERAL DESCRIPTION

The ADT7301 is a complete temperature monitoring system

available in SOT-23 and MSOP packages. It contains a band gap

temperature sensor and a 13-bit ADC to monitor and digitize

the temperature reading to a resolution of 0.03125°C.

The ADT7301 has a flexible serial interface that allows easy

interfacing to most microcontrollers. The interface is compat-

ible with SPI®, QSPI™, and MICROWIRE™ protocols as well as

DSPs. The part features a standby mode that is controlled via

the serial interface. The ADT7301’s wide supply voltage range,

low supply current, and SPI compatible interface make it ideal

for a variety of applications, including personal computers,

office equipment, automotive, and domestic appliances. The

ADT7301 is rated for operation over the -40°C to +150°C

temperature range. It is not recommended to operate the device

at temperatures above +125°C for greater than a total of 5%

(5,000 hours) of the lifetime of the device. Any exposure

beyond this limit will affect device reliability.

PRODUCT HIGHLIGHTS

1.

The ADT7301 has an on-chip temperature sensor that

allows an accurate measurement of the ambient tempera-

ture. The measurable temperature range is −40°C to

+150°C.

2.

Supply voltage of 2.7 V to 5.5 V.

3.

Space-saving 6-lead SOT-23 and 8-lead MSOP packages.

4.

Temperature accuracy of ±0.5°C.

5.

13-bit temperature reading to 0.03125°C resolution.

6.

The ADT7301 features a shutdown mode that reduces the