AD7814 Analog Devices, Inc., AD7814 Datasheet

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AD7814

Manufacturer Part Number
AD7814
Description
10-bit Digital Temperature Sensor In 6-lead Sot-23
Manufacturer
Analog Devices, Inc.
Datasheet

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a
Purchase of licensed I
Associated Companies conveys a license for the purchaser under the Philips I
Patent Rights to use these components in an I
conforms to the I
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.
GENERAL DESCRIPTION
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.
The AD7814 has a flexible serial interface that allows easy inter-
facing to most microcontrollers. The interface is compatible
with SPI
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.
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
®
, QSPI™, and MICROWIRE™ protocol, and is also
2
C Standard Specification as defined by Philips.
2
C components of Analog Devices or one of its sublicensed
2
C system, provided that the system
2
C
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 MSOP
4. 10-bit temperature reading to 0.25°C resolution
5. Standby mode that reduces the current consumption to 1 µA
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
GND
FUNCTIONAL BLOCK DIAGRAM
TEMPERATURE
AD7814
BAND GAP
SENSOR
© 2004 Analog Devices, Inc. All rights reserved.
INTERFACE
SERIAL
in 6-Lead SOT-23
BUS
ANALOG/DIGITAL
TEMPERATURE
CONVERTER
REGISTER
VALUE
10-BIT
AD7814
www.analog.com
V
SCLK
DIN
DOUT
CS
DD

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AD7814 Summary of contents

Page 1

... 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. The AD7814 has a flexible serial interface that allows easy inter- facing to most microcontrollers. The interface is compatible ® with SPI , QSPI™ ...

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 1 sps 10 sps 100 sps 3 DIGITAL INPUT Input High Voltage, V ...

Page 3

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD7814 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 4

... Positive Supply Voltage, 2 5.5 V Serial Clock Input. This is the clock input for the serial port. The serial clock is used to clock data out of the temperature value register of the AD7814 and to clock data into the control register on the part. Chip Select Input. Logic input. The device is selected when this input is low. ...

Page 5

... To ensure that no lock- out signal is set, bring the CS low at a greater or less time than 350 µs (± 30%). This will mean that the AD7814 is not inter- rupted during a conversion process. The AD7814 can be placed in a shutdown mode, via the control register, in which case the on-chip oscillator is shut down and no further conversions are initiated until the AD7814 is taken out of shutdown mode ...

Page 6

... At the end of the read operation, the DOUT line remains in the state of the last bit of data clocked out of the AD7814 until CS returns high, at which time the DOUT line goes into three-state. ...

Page 7

... Care should be taken to ensure that this is in good thermal contact with the surface being measured. SDI As with any IC, the AD7814 and its associated wiring and cir- RA1 cuits must be kept free from moisture to prevent leakage and corrosion, particularly in cold conditions where condensation is more likely to occur ...

Page 8

... AD7814 INDICATOR 0.15 MAX Revision History Location 8/04—Data Sheet Changed from REV REV. E. Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Changes to CONVERTER DETAILS section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Changes to Read Operation section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5/02—Data Sheet Changed from REV REV. D. Updates to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 OUTLINE DIMENSIONS 6-Lead Small Outline Transistor Package [SOT-23] ...

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