ad7314 Analog Devices, Inc., ad7314 Datasheet

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ad7314

Manufacturer Part Number
ad7314
Description
Low-voltage, 10-bit Digital Temperature Sensor In 8-lead Usoic
Manufacturer
Analog Devices, Inc.
Datasheet

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a
GENERAL DESCRIPTION
The AD7314 is a complete temperature monitoring system in
an 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 AD7314 has a flexible serial interface that allows easy
interfacing to most microcontrollers. The interface is compat-
ible with SPI, QSPI™, and MICROWIRE™ protocols and is
also compatible with DSPs. The part features a standby mode
that is controlled via the serial interface.
The AD7314’s low supply current and SPI compatible interface
make it ideal for a variety of applications, including personal
computers, office equipment, and domestic appliances.
REV. 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. Trademarks and
registered trademarks are the property of their respective owners.
FEATURES
10-Bit Temperature-to-Digital Converter
–35 C to +85 C Operating Temperature Range
SPI
Shutdown Mode
Space-Saving MSOP Package
APPLICATIONS
Hard Disk Drives
Personal Computers
Electronic Test Equipment
Office Equipment
Domestic Appliances
Process Control
Mobile Phones
2 C Accuracy
®
and DSP Compatible Serial Interface
Low Voltage, 10-Bit Digital Temperature
PRODUCT HIGHLIGHTS
1. The AD7314 has an on-chip temperature sensor that allows
2. Supply voltage of 2.65 V to 5.5 V.
3. Space-saving 8-lead MSOP package.
4. 10-bit temperature reading to 0.25∞C resolution.
5. The AD7314 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 –35∞C to +85∞C, with a
± 2∞C temperature accuracy.
current consumption to 1 mA max.
GND
FUNCTIONAL BLOCK DIAGRAM
TEMPERATURE
BAND GAP
AD7314
SENSOR
Sensor in 8-Lead MSOP
© 2003 Analog Devices, Inc. All rights reserved.
INTERFACE
ANALOG-TO-DIGITAL
SERIAL
TEMPERATURE
BUS
CONVERTER
REGISTER
VALUE
10-BIT
AD7314
www.analog.com
CE
SCLK
SDI
SDO
ID
V
DD

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ad7314 Summary of contents

Page 1

... Supply voltage Space-saving 8-lead MSOP package. 4. 10-bit temperature reading to 0.25∞C resolution. 5. The AD7314 features a standby mode that reduces the current consumption max. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 Fax: 781/326-8703 ...

Page 2

... AD7314–SPECIFICATIONS Parameter TEMPERATURE SENSOR AND ADC Accuracy Resolution Update Rate Temperature Conversion Time SUPPLIES Supply Voltage Supply Current Normal Mode (Inactive) Normal Mode (Active) Shutdown Mode Power Dissipation Power Dissipation 1 SPS 10 SPS 100 SPS 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 AD7314 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

... SDI Serial Data Input. Serial data to be loaded to the parts’s control register is provided on this input Identification. This pin can be used by a master device to identify the AD7314 in an SPI bus system. This pin has an internal pull-down resistor Positive Supply Voltage, 2. 5.5 V. ...

Page 5

... At the end of the read operation, the SDO line remains in the state of the last bit of data clocked out of the AD7314 until CE returns low, at which time the SDO line goes into three-state. –5– ...

Page 6

... SCLK. Only the third bit in the data stream provides a user-controlled function. This third bit is the power- down bit which, when set puts the AD7314 into shutdown mode. The first two bits of the data stream are don’t cares while all other bits in the data stream other than the power-down bit should ensure correct operation of the AD7314 ...

Page 7

... SUPPLY DECOUPLING The AD7314 should at least be decoupled with a 0.1 mF ceramic capacitor between V and GND. This is particularly important DD if the AD7314 is mounted remote from the power supply. TYPICAL TEMPERATURE ERROR GRAPHS Figure 6 shows a typical temperature error plot for one device with V at 2.65 V. ...

Page 8

... AD7314 Revision History Location 10/03—Data Sheet changed from REV REV. A. Change to PRODUCT HIGHLIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Changes to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Change to PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Change to CIRCUIT INFORMATION section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 OUTLINE DIMENSIONS 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 3 ...

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