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FEATURES
FUNCTIONAL BLOCK DIAGRAM
13-bit temperature-to-digital converter
−40°C to +150°C operating temperature range
0.5°C typical accuracy
BAND GAP
TEMPERATURE
SENSOR
13-BIT
ANALOG/DIGITAL
CONVERTER
0.03125°C temperature resolution
Shutdown current of 1 μA
Power dissipation of 0.631 mW at VDD = 3.3 V
SPI- and DSP-compatible serial interface
Shutdown mode
GND
V
DD
TEMPERATURE
VALUE
REGISTER
ADT7301
CS
SERIAL
BUS
INTERFACE
SCLK
DIN
Space-saving SOT-23 and MSOP packages
Compatible with AD7814
DOUT
APPLICATIONS
Medical equipment
Automotive
Figure 1.
Environmental controls
Oil temperature
Hydraulic systems
Cellular phones
Hard disk drives
Personal computers
Electronic test equipment
Office equipment
Domestic appliances
Process control
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
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.
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.
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.
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 VDD = 3.3 V @ 1 SPS.
7. Compatible with AD7814.
Rev. 0
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