ANALOG DEVICES ADT7301 Service Manual

±1°C Accurate, 13-Bit,

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
Power dissipation of 0.631 mW at V
SPI- and DSP-compatible serial interface
Shutdown mode
Space-saving SOT-23 and MSOP packages
Compatible with AD7814

APPLICATIONS

Medical equipment
Automotive
Environmental controls
Oil temperature
Hydraulic systems
Cellular phones
Hard disk drives
Personal computers
Electronic test equipment
Office equipment
Domestic appliances
Process control

GENERAL DESCRIPTION

= 3.3 V

DD

Digital Temperature Sensor

ADT7301

FUNCTIONAL BLOCK DIAGRAM

BAND GAP

TEMPERATURE

SENSOR

GND

ADT7301

INTERFACE

PRODUCT HIGHLIGHTS

13-BIT

ANALOG/DIGITAL

CONVERTER

TEMPERATURE

VALUE

REGISTER

SERIAL

BUS

Figure 1.

V

DD

CS
SCLK
DIN
DOUT

02884-0-001

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 compati-

ble 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. Exposure beyond this
limit affects device reliability.

Rev. B

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1. On-chip temperature sensor that allows an accurate

measurement of the ambient temperature. The measurable
temperature range is −40°C to +150°C.

2. Supply voltage of 2.7 V to 5.25 V.

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

4. Typical temperature accuracy of ±0.5°C.

5. 13-bit temperature reading to 0.03125°C resolution.

6. Shutdown mode that reduces the power consumption to

4.88 μW with V

= 3.3 V @ 1 SPS.

DD

7. Compatible with AD7814.

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