10-Bit Digital Temperature Sensor
in 6-Lead SOT-23
a
AD7814
FUNCTIONAL BLOCK DIAGRAM
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
BAND GAP
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 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 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 MSOP
package
4. 10-bit temperature reading to 0.25°C resolution
5. Standby mode that reduces the current consumption to 1 µA
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 I2C components of Analog Devices or one of its sublicensed
Associated Companies conveys a license for the purchaser under the Philips I2C
Patent Rights to use these components in an I2C system, provided that the system
conforms to the I2C Standard Specification as defined by Philips.
REV. E
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