AD7814ART Analog Devices, AD7814ART Datasheet

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AD7814ART

Manufacturer Part Number
AD7814ART
Description
Manufacturer
Analog Devices
Datasheet

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a
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.
REV. D
GENERAL DESCRIPTION
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.
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.
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.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor, Inc.
FEATURES
10-Bit Temperature-to-Digital Converter
–55 C to +125 C Operating Temperature Range
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
2 C Accuracy
10-Bit Digital Temperature Sensor
PRODUCT HIGHLIGHTS
1. The AD7814 has an on-chip temperature sensor that allows
2. Supply voltage of 2.7 V to 5.5 V
3. Space-saving 6-lead SOT-23 package and 8-lead µSOIC
4. 10-bit temperature reading to 0.25°C resolution
5. The AD7814 features a standby mode that reduces the
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
an accurate measurement of the ambient temperature. The
measurable temperature range is –55°C to +125°C, with a
± 2°C temperature accuracy.
package
current consumption to 1 µA.
GND
FUNCTIONAL BLOCK DIAGRAM
TEMPERATURE
AD7814
BAND GAP
SENSOR
INTERFACE
SERIAL
in 6-Lead SOT-23
BUS
ANALOG/DIGITAL
TEMPERATURE
CONVERTER
REGISTER
VALUE
10-BIT
© Analog Devices, Inc., 2002
AD7814
www.analog.com
V
SCLK
DIN
DOUT
CS
DD

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AD7814ART Summary of contents

Page 1

... SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor, Inc. REV. D 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 ...

Page 2

AD7814–SPECIFICATIONS Parameter TEMPERATURE SENSOR AND ADC Accuracy Resolution Update Rate Temperature Conversion Time SUPPLIES Supply Voltage Supply Current Normal Mode Shutdown Mode ( Shutdown Mode ( Power Dissipation Power Dissipation ...

Page 3

... Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Temperature Model Range AD7814ART –55°C to +125°C AD7814ARM –55°C to +125°C *Temperature error is over 0°C to 85°C temperature range. CAUTION ESD (electrostatic discharge) sensitive device ...

Page 4

AD7814 Pin SOT-23 SOIC Mnemonic Pin No. Pin No. GND 1 7 DIN SCLK DOUT SOT-23 GND 1 AD7814 DIN 2 TOP VIEW (Not ...

Page 5

CIRCUIT INFORMATION The AD7814 is a 10-bit digital temperature sensor. The part houses an on-chip temperature sensor, a 10-bit A/D converter, a reference, and serial interface logic functions in an SOT-23 package. The A/D converter section consists of a conventional ...

Page 6

AD7814 SCLK LEADING DOUT ZERO DON'T DIN CARE Read Operation Figure 2 shows the timing diagram for a serial read from the AD7814. The CS line enables the SCLK input. Ten bits of ...

Page 7

In the example shown, the AD7814 is connected to the serial port of the 8051. Because the serial interface of the 8xC51 con- tains only one data line, the DIN line of the AD7814 is tied low in the interface ...

Page 8

AD7814 0.071 (1.80) 0.059 (1.50) 0.051 (1.30) 0.035 (0.90) Revision History Location Data Sheet changed from REV REV. D. Updates to SPECIFICATIONS . . . . . . . . . . . . . . . . ...

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