10-Bit Digital Temperature Sensor
in 6-Lead SOT-23
a
AD7814
FEATURES
FUNCTIONAL BLOCK DIAGRAM
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
BANDGAP
TEMPERATURE
SENSOR
10-BIT
ANALOG/DIGITAL
CONVERTER
GND
V
DD
Space-Saving SOT-23 Package
TEMPERATURE
VALUE
REGISTER
AD7814
APPLICATIONS
Hard Disk Drives
Personal Computers
Electronic Test Equipment
Office Equipment
Domestic Appliances
Process Control
CS
SERIAL
SCLK
DIN
BUS
INTERFACE
DOUT
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
The AD7814 is a complete temperature monitoring system in
an SOT-23 package or 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.
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.
The AD7814 has a flexible serial interface that allows easy inter-
facing to most microcontrollers. The interface is compatible
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.
2. Supply voltage of +2.7 V to +5.5 V.
3. Space-saving 6-lead SOT-23 package and 8-lead µSOIC
package.
4. 10-bit temperature reading to +0.25°C resolution.
5. The AD7814 features a standby mode that reduces the
The AD7814’s wide supply voltage range, low supply current
and SPI-compatible interface, make it ideal for a variety of ap-
plications, including personal computers, office equipment, and
domestic appliances.
current consumption to 1 µA.
SPI is a trademark of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor, Inc.
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
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