REV. E

a

AD7814

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10-Bit Digital Temperature Sensor

in 6-Lead SOT-23

FUNCTIONAL BLOCK DIAGRAM

SERIAL

BUS

INTERFACE

AD7814

CS

SCLK

DIN

DOUT

GND

TEMPERATURE

VALUE

REGISTER

10-BIT

ANALOG/DIGITAL

CONVERTER

BAND GAP

TEMPERATURE

SENSOR

FEATURES

10-Bit Temperature-to-Digital Converter

–55 C to +125 C Operating Temperature Range

2 C Accuracy

SPI- and DSP-Compatible Serial Interface

Shutdown Mode

Space-Saving SOT-23 Package

APPLICATIONS

Hard Disk Drives

Personal Computers

Electronic Test Equipment

Office Equipment

Domestic Appliances

Process Control

GENERAL DESCRIPTION

The AD7814 is a complete temperature monitoring system in a

SOT-23 package or 8-lead MSOP package. It contains a band

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

the temperature reading to a resolution of 0.25

°C.

The AD7814 has a flexible serial interface that allows easy inter-

facing to most microcontrollers. The interface is compatible

with SPI

compatible with DSPs. The part features a standby mode that is

controlled via the serial interface.

The AD7814’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,

and domestic appliances.

Purchase of licensed I

Associated Companies conveys a license for the purchaser under the Philips I

Patent Rights to use these components in an I

conforms to the I

PRODUCT HIGHLIGHTS

1. The AD7814 has an on-chip temperature sensor that allows

an accurate measurement of the ambient temperature. The

measurable temperature range is –55

°C to +125°C, with a

±2°C temperature accuracy.

2. Supply voltage of 2.7 V to 5.5 V

3. Space-saving 6-lead SOT-23 package and 8-lead MSOP

package

4. 10-bit temperature reading to 0.25

°C resolution

5. Standby mode that reduces the current consumption to 1

µA