0.5C Accurate, 10-Bit Digital Temperature Sensors in SOT-23 AD7414/AD7415 FUNCTIONAL BLOCK DIAGRAM FEATURES 10-bit temperature-to-digital converter 10-BIT BAND GAP TEMPERATURE ANALOG-DIGITAL GND Temperature range: 40C to +125C SENSOR CONVERTER Typical accuracy of 0.5C at +40C V DD 2 CONFIGURATION SMBus/I C-compatible serial interface TEMPERATURE REGISTER VALUE 3 A power-down current REGISTER T SETPOINT HIGH REGISTER Temperature conversion time: 29 s typ SETPOINT T SETPOINT ALERT LOW Space-saving 6-lead (AD7414) and 5-lead (AD7415) COMPARATOR REGISTER SOT-23 packages Pin selectable addressing via AS SCL 2 SMBus/I C INTERFACE AS Overtemperature indicator (AD7414 Only) SDA SMBus alert function (AD7414 only) AD7414 2 4 versions allow 8 I C addresses (AD7414) AD7415 2 2 versions allow 6 I C addresses (AD7415) 10-BIT BAND GAP ANALOG-DIGITAL TEMPERATURE GND V DD APPLICATIONS SENSOR CONVERTER Hard disk drives TEMPERATURE Personal computers CONFIGURATION VALUE REGISTER REGISTER Electronic test equipment AS Office equipment SCL 2 Domestic appliances SMBus/I C INTERFACE SDA Process control Cellular phones Figure 1. GENERAL DESCRIPTION limit is exceeded. A configuration register allows programming of The AD7414/AD7415 are complete temperature monitoring the state of the ALERT output (active high or active low). This systems in 6-lead and 5-lead SOT-23 packages. They contain a output can be used as an interrupt or as an SMBus alert. band gap temperature sensor and a 10-bit ADC to monitor and digitize the temperature reading to a resolution of 0.25C. PRODUCT HIGHLIGHTS The AD7414/AD7415 provide a 2-wire serial interface that is 1. On-chip temperature sensor. The sensor allows an accurate 2 compatible with SMBus and I C interfaces. The parts come in four measurement of the ambient temperature to be made. It is versions: the AD7414/AD7415-0, AD7414/AD7415-1, AD7414-2, capable of 0.5C temperature accuracy. and AD7414-3. The AD7414/AD7415-0 and AD7414/AD7415-1 2 2. SMBus/I C-compatible serial interface. The interface offers pin versions provide a choice of three different SMBus addresses for selectable choice of three addresses per version of the each version. All four AD7414 versions give the possibility of eight AD7414/AD7415, eight address options in total for the AD7414, 2 different I C addresses while the two AD7415 versions allow up to and six in total for the AD7415. 2 six I C addresses to be used. 3. Supply voltage of 2.7 V to 5.5 V. The AD7414/AD7415s 2.7 V supply voltage, low supply current, serial interface, and small package size make them ideal for a 4. Space-saving 5-lead and 6-lead SOT-23 packages. variety of applications, including personal computers, office 5. 10-bit temperature reading to 0.25C resolution. equipment, cellular phones, and domestic appliances. 6. Overtemperature indicator. This indicator can be software In the AD7414, on-chip registers can be programmed with high disabled. It is used as an interrupt of SMBus alert. and low temperature limits, and an open-drain overtemperature 7. One-shot and automatic temperature conversion rates. indicator output (ALERT) becomes active when a programmed Rev. F 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Specifications subject to change without notice. No license is granted by implication Tel: 781.329.4700 www.analog.com or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 20012010 Analog Devices, Inc. All rights reserved. 02463-001AD7414/AD7415 TABLE OF CONTENTS Specifications ..................................................................................... 3 Serial Interface ................................................................................. 12 Absolute Maximum Ratings ............................................................ 5 Serial Bus Address ....................................................................... 12 ESD Caution .................................................................................. 5 Write Mode .................................................................................. 12 Pin Configurations and Function Descriptions ............................ 6 Read Mode ................................................................................... 12 Theory of Operation ......................................................................... 7 SMBUS ALERT............................................................................. 13 Circuit Information ...................................................................... 7 Power-On Defaults ..................................................................... 13 Functional Description................................................................. 7 Operating Modes ........................................................................ 13 Measurement Technique .............................................................. 7 Power vs. Throughput ................................................................ 14 Temperature Data Format ............................................................ 8 Mounting the AD7414/AD7415 ............................................... 14 Internal Register Structure ............................................................... 9 Supply Decoupling ...................................................................... 14 Address Pointer Register .............................................................. 9 Temperature Accuracy vs. Supply ............................................. 15 Configuration Register (Address 0X01) ..................................... 9 Typical Temperature Error Graph ............................................ 15 Temperature Value Register (Address 0X00) ........................... 10 Outline Dimensions ........................................................................ 16 AD7414 T Register (Address 0X02) ................................... 10 Ordering Guide ........................................................................... 18 HIGH AD7414 T Register (Address 0X03) .................................... 10 LOW REVISION HISTORY Updated Circuit Information .......................................................... 5 11/10Rev. E to Rev. F Updated Temperature Data Format................................................ 6 Added Data Hold Time, t Parameter, Table 1 .............................. 4 7 Updated Temperature Value Register ............................................. 8 Changes to Figure 2 ........................................................................... 4 Updated Figure 14 ........................................................................... 11 Updated to Outline Dimensions ................................................... 16 Updated Outline Dimensions ........................................................ 12 Changes to Ordering Guide ........................................................... 18 11/02Rev. A to Rev. B. 4/05Rev. D to Rev. E Changes to Absolute Maximum Ratings........................................ 3 Updated Format .................................................................. Universal Changes to Absolute Maximum Ratings ........................................ 6 10/02Rev. 0 to Rev. A. Changes to Figure 6 ........................................................................... 7 Changes to Specifications ................................................................ 2 Changes to Ordering Guide ........................................................... 17 Changes to Pin Function Descriptions .......................................... 3 Changes to Absolute Maximum Ratings........................................ 3 9/04Rev. C to Rev. D. Ordering Guide Updated ................................................................. 4 Changes to Absolute Maximum Ratings ........................................ 3 Change to Figure 2 ............................................................................ 5 Updated Ordering Guide ................................................................. 4 Added to Typical Temperature 8/03Rev. B to Rev. C. Error Graph section ........................................................................ 11 Change to Temperature Range ......................................... Universal Added Figure 15 .............................................................................. 11 Updated Features ............................................................................... 1 Outline Dimensions updated ........................................................ 12 Updated Specifications ..................................................................... 2 7/01Revision 0: Initial Version Updated Absolute Maximum Ratings ............................................ 3 Updated Ordering Guide ................................................................. 4 Rev. F Page 2 of 20