a
10-Bit Digital Temperature Sensor
in 6-Lead SOT-23
AD7814
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
FUNCTIONAL BLOCK DIAGRAM
BAND GAP
TEMPERATURE
SENSOR
10-BIT
ANALOG/DIGITAL
CONVERTER
GND
VDD
TEMPERATURE
VALUE
REGISTER
AD7814
SERIAL
BUS
INTERFACE
CS
SCLK
DIN
DOUT
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
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.
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 interfacing 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
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.
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
Purchase of licensed I 2C components of Analog Devices or one of its sublicensed
Associated Companies conveys a license for the purchaser under the Philips I 2C
Patent Rights to use these components in an I 2C system, provided that the system
conforms to the I 2C Standard Specification as defined by Philips.
REV. E
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
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© 2004 Analog Devices, Inc. All rights reserved.
