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a

AD7314

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2001

Low-Voltage, 10-Bit Digital Temperature

Sensor in 8-Lead SOIC

FUNCTIONAL BLOCK DIAGRAM

FEATURES

10-Bit Temperature-to-Digital Converter

–35 C to +85 C Operating Temperature Range

2 C Accuracy

SPI™- and DSP-Compatible Serial Interface

Shutdown Mode

Space-Saving

SOIC Package

APPLICATIONS

Hard Disk Drives

Personal Computers

Electronic Test Equipment

Office Equipment

Domestic Appliances

Process Control

Mobile Phones

GENERAL DESCRIPTION

The AD7314 is a complete temperature monitoring system in

an 8-lead

µSOIC package. It contains a bandgap temperature

sensor and 10-bit ADC to monitor and digitize the temperature

reading to a resolution of 0.25

°C.

The AD7314 has a flexible serial interface that allows easy

interfacing to most microcontrollers. The interface is compat-

ible with SPI, QSPI and MICROWIRE™ protocol and is also

compatible with DSPs. The part features a standby mode that

is controlled via the serial interface.

The AD7314’s low supply current and SPI-compatible interface,

make it ideal for a variety of applications, including personal

computers, office equipment, and domestic appliances.

PRODUCT HIGHLIGHTS

1. The AD7314 has an on-chip temperature sensor that allows

an accurate measurement of the ambient temperature. The

measurable temperature range is –35

°C to +85°C, with a

±2°C temperature accuracy.

2. Supply voltage of 2.65 V to 2.9 V.

3. Space-saving 8-lead

µSOIC package.

4. 10-bit temperature reading to 0.25

°C resolution.

5. The AD7314 features a standby mode that reduces the

current consumption to 1

µA max.

SPI is a trademark of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corporation.

AD7314

BANDGAP

TEMPERATURE

SENSOR

SERIAL

BUS

INTERFACE

GND

ID

CE

SCLK

SDI

SDO

10-BIT

ANALOG/DIGITAL

CONVERTER

TEMPERATURE

VALUE

REGISTER