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Low-Voltage, 10-Bit Digital Temperature Sensor in 8-Lead SOIC AD7314
FUNCTIONAL BLOCK DIAGRAM
BANDGAP TEMPERATURE SENSOR 10-BIT ANALOG/DIGITAL CONVERTER ID GND TEMPERATURE VALUE REGISTER VDD
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
AD7314
SERIAL BUS INTERFACE
CE SCLK SDI SDO
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
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 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 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.
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
AD7314–SPECIFICATIONS1 (T = T
A
MIN
to TMAX, VDD = 2.65 V to 2.9 V, unless otherwise noted.)
Max ± 2.0 Unit °C Bits µs µs V µA mA µA µW µW µW µW V V µA pF V V pF Test Conditions/Comments TA = –35°C to +85°C.
Parameter TEMPERATURE SENSOR AND ADC Accuracy Resolution Update Rate, tR 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, VIH Input Low Voltage, VIL Input Current, IIN Input Capacitance, CIN DIGITAL OUTPUT Output High Voltage, VOH Output Low Voltage, VOL Output Capacitance, COUT
Min
Typ
10 400 25 2.65 .
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