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7314 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer 7314
Beschreibung Low-Voltage/ 10-Bit Digital Temperature Sensor in 8-Lead uSOIC
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 8 Seiten
7314 Datasheet, Funktion
a Low-Voltage, 10-Bit Digital Temperature
Sensor in 8-Lead SOIC
AD7314
FEATURES
10-Bit Temperature-to-Digital Converter
–35؇C to +85؇C Operating Temperature Range
؎2؇C Accuracy
SPI™- and DSP-Compatible Serial Interface
Shutdown Mode
Space-Saving SOIC Package
APPLICATIONS
Hard Disk Drives
Personal Computers
Electronic Test Equipment
Office Equipment
Domestic Appliances
Process Control
Mobile Phones
FUNCTIONAL BLOCK DIAGRAM
BANDGAP
TEMPERATURE
SENSOR
GND
AD7314
10-BIT
ANALOG/DIGITAL
CONVERTER
TEMPERATURE
VALUE
REGISTER
SERIAL
BUS
INTERFACE
ID
VDD
CE
SCLK
SDI
SDO
GENERAL DESCRIPTION
The AD7314 is a complete temperature monitoring system in
an 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 AD7314 has a flexible serial interface that allows easy
interfacing to most microcontrollers. The interface is compat-
ible 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 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.
PRODUCT HIGHLIGHTS
1. The AD7314 has an on-chip temperature sensor that allows
an accurate measurement of the ambient temperature. The
measurable temperature range is –35°C to +85°C, with a
± 2°C temperature accuracy.
2. Supply voltage of 2.65 V to 2.9 V.
3. Space-saving 8-lead µSOIC package.
4. 10-bit temperature reading to 0.25°C resolution.
5. The AD7314 features a standby mode that reduces the
current consumption to 1 µA max.
SPI is a trademark of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation.
REV. 0
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001






7314 Datasheet, Funktion
AD7314
CE
SCLK
SDO
SDI
123 4
t4
LEADING
ZERO
DB9
DB8
t6
DON'T
CARE
DON'T
CARE
POWER-
DOWN
DATA-IN IS LOADED INTO
CONTROL REGISTER
ON THIS EDGE
11 12
DB0
Figure 3. Serial Interface Diagram
15 16
Write Operation
Figure 3 also shows the interface diagram for a serial write to
the AD7314. The write operation takes place at the same time
as the read operation. Data is clocked into the Control Register
on the falling edge of 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 to a 1, 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 be 0 to ensure correct operation of the AD7314. Data is
loaded into the Control Register on the fifteenth rising SCLK
edge. The data takes effect at this time i.e., if the part is pro-
grammed to go into shutdown, it does so at this point. If the CE
is brought low before this fifteenth SCLK edge, the Control
Register will not be loaded and the power-down status of the
part will not change.
MICROCONTROLLER INTERFACING
The AD7314 serial interface allows for easy interface to most
microcontrollers and microprocessors. A typical interface circuit
is shown in Figure 4.
AD7314*
SCLK
SDI
SDO
CE
Controller*
SCLK
DOUT
DIN
CE
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 4. Typical Interface
The ID pin of the AD7314 can be used to distinguish the device
if used as a drop-in replacement temperature sensor. Connected
to Pin 7 (ID pin) is a 1 kinternal pull-down resistor. If a pull-
up resistor is used on Pin 7 to aid in identifying a device then we
recommend a pull-up value of 100 kwith VDD at 2.9 V nominal.
Figure 5 shows the recommended pull-up resistor value for the
ID pin. The recommended resistor value in Figure 5 minimizes
the additional power the AD7314 has to dissipate, thus reducing
any negative affects on the temperature sensor measurements.
2.9V
AD7314*
ID
100k
Controller*
1k
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 5. Typical ID Pin Interface
MOUNTING THE AD7314
The AD7314 can be used for surface or air-temperature sensing
applications. If the device is cemented to a surface with thermally
conductive adhesive, the die temperature will be within about
0.1°C of the surface temperature, thanks to the devices low
power consumption. Care should be taken to insulate the back
and leads of the device from the air, if the ambient air tempera-
ture is different from the surface temperature being measured.
The ground pin provides the best thermal path to the die, so the
temperature of the die will be close to that of the printed circuit
ground track. Care should be taken to ensure that this is in good
thermal contact with the surface being measured.
As with any IC, the AD7314 and its associated wiring and cir-
cuits must be kept free from moisture to prevent leakage and
corrosion, particularly in cold conditions where condensation is
more likely to occur. Water-resistant varnishes and conformal
coatings can be used for protection. The small size of the AD7314
package allows it to be mounted inside sealed metal probes,
which provide a safe environment for the device.
–6– REV. 0

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