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AD5171BRJ5-R2 데이터시트(PDF) 1 Page - Analog Devices |
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AD5171BRJ5-R2 데이터시트(HTML) 1 Page - Analog Devices |
1 / 20 page 64-Position OTP Digital Potentiometer AD5171 FEATURES 64 positions OTP (one-time programmable)1 set-and-forget resistance setting—low cost alternative over EEMEM Unlimited adjustments prior to OTP activation 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ end-to-end resistance Low tempco 5 ppm/oC in potentiometer mode Rev. PrC Low tempco 35 ppm/°C in rheostat mode Compact standard SOT-23-8 package Low power, IDD = 8 µA max Fast settling time, ts = 5 µs typ in power-up I2C compatible digital interface Computer software replaces µc in factory programming applications Full read/write of wiper register Extra I2C device address pin Power-on preset to midscale 6 V one-time programming voltage Low operating voltage, 2.7 V to 5.5 V OTP validation check function Automotive temperature range −40°C to +125°C APPLICATIONS Systems calibrations Electronics level settings Mechanical potentiometers and trimmers® replacements Automotive electronics adjustments Gain control and offset adjustments Transducer circuits adjustments Programmable filters up to 1.5 MHz BW GENERAL DESCRIPTION The AD5171 is a 64-position, one-time programmable (OTP) digital potentiometer2, which employs fuse link technology to achieve the memory retention of resistance setting function. OTP is a cost-effective alternative over the EEMEM approach for users who do not need to reprogram new memory setting in the digital potentiometer. This device performs the same electronic adjustment function like most mechanical trimmers and variable resistors do. The AD5171 is programmed using a 2-wire I2C compatible digital control. It allows unlimited adjustments before permanently setting the resistance value. During the OTP activation, a permanent fuse blown command is sent after the final value is determined; therefore freezing the wiper position at a given setting (analogous to placing epoxy on a mechanical trimmer). When this permanent setting is achieved, the value will not change regardless of supply variations or environmental stresses under normal operating conditions. To verify the success of permanent programming, Analog Devices patterned the OTP validation such that the fuse status can be discerned from two validation bits in read mode. For applications that program AD5171 in the factories, Analog Devices offers a device programming software, which operates across Windows® 95 to XP® platforms including Windows NT®. This software application effectively replaces the need for external I2C controllers or host processors and therefore significantly reduces users’ development time. An AD5171 evaluation kit is available, which includes the software, connector, and cable that can be converted for the factory programming applications. The AD5171 is available in a compact SOT-23-8 package. All parts are guaranteed to operate over the automotive temperature range of −40°C to +125°C. Besides its unique OTP feature, the AD5171 lends itself well to other general-purpose digital potentiometer applications due to its temperature performance, small form factor, and low cost. GND I2C INTERFACE AND CONTROL LOGIC A W B WIPER REGISTER FUSE LINK VDD AD0 SDA SCL AD5171 Figure 1. Functional Block Diagram TOP VIEW (Not to Scale) 8 7 6 5 1 2 3 4 W VDD GND SCL A B AD0 SDA AD5171 Figure 2. Pin Configuration 1One-time programmable (OTP) - Unlimited adjustments before permanent setting. 2The terms digital potentiometer and RDAC are used interchangeably. 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. Specifications subject to change without notice. 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. 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 © 2003 Analog Devices, Inc. All rights reserved. Preliminary Technical Data |
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