64-Position OTP Digital Potentiometer AD5171 APPLICATIONS For applications that program the AD5171 in factories, Analog Devices offers device programming software that operates across Windows(R) 95 to XP(R) platforms including Windows NT(R). 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 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 -40C to +125C. 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. Systems calibrations Electronics level settings Mechanical potentiometers and trimmers(R) replacements Automotive electronics adjustments Gain control and offset adjustments Transducer circuits adjustments Programmable filters up to 1.5 MHz BW SCL SDA W AD0 B WIPER REGISTER VDD GENERAL DESCRIPTION GND The AD5171 is a 64-position, one-time programmable (OTP) digital potentiometer2 that uses fuse link technology to achieve the memory retention of the resistance setting function. OTP is a cost-effective alternative over the EEMEM approach for users who do not need to reprogram new memory settings in the digital potentiometer. This device performs the same electronic adjustment function as most mechanical trimmers and variable resistors. 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 A I2C INTERFACE AND CONTROL LOGIC FUSE LINK AD5171 03437-0-001 64 positions OTP (one-time programmable)1 set-and-forget resistance setting--low cost alternative over EEMEM Unlimited adjustments prior to OTP activation 5 k, 10 k, 50 k, 100 k end-to-end resistance Low tempco 5 ppm/oC in potentiometer mode Low tempco 35 ppm/C in rheostat mode Compact standard SOT-23-8 package Low power, IDD = 10 A max Fast settling time, ts = 5 s typ in power-up I2C compatible digital interface Computer software replaces C 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 -40C to +125C mechanical trimmer). When this permanent setting is achieved, the value does 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. Figure 1. Functional Block Diagram W 1 VDD 2 AD5171 8 A 7 B TOP VIEW 6 AD0 (Not to Scale) 5 SDA SCL 4 GND 3 03437-0-002 FEATURES Figure 2. Pin Configuration 1 One-time programmable (OTP)--Unlimited adjustments before permanent setting. 2 The terms digital potentiometer and RDAC are used interchangeably. 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. 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 (c) 2004 Analog Devices, Inc. All rights reserved. AD5171 OUTLINE DIMENSIONS 2.90 BSC 8 7 6 5 1 2 3 4 1.60 BSC 2.80 BSC PIN 1 0.65 BSC 1.30 1.15 0.90 1.95 BSC 1.45 MAX 0.15 MAX 0.38 0.22 0.22 0.08 SEATING PLANE 0.60 0.45 0.30 8 4 0 COMPLIANT TO JEDEC STANDARDS MO-178BA Figure 51. 8-Lead Small Outline Transistor Package [SOT-23] (RJ-8) Dimensions shown in millimeters ORDERING GUIDE Model AD5171BRJ5-R2 AD5171BRJ5-RL7 AD5171BRJZ5-R21 AD5171BRJZ5-R71 AD5171BRJ10-R2 AD5171BRJ10-RL7 AD5171BRJZ10-R21 AD5171BRJZ10-R71 AD5171BRJ50-R2 AD5171BRJ50-RL7 AD5171BRJZ50-R21 AD5171BRJZ50-R71 AD5171BRJ100-R2 AD5171BRJ100-RL7 AD5171BRJZ100-R21 AD5171BRJZ100-R71 AD5171EVAL2 1 2 RAB (k) 5 5 5 5 10 10 10 10 50 50 50 50 100 100 100 100 10 Package Code RJ-8 RJ-8 RJ-8 RJ-8 RJ-8 RJ-8 RJ-8 RJ-8 RJ-8 RJ-8 RJ-8 RJ-8 RJ-8 RJ-8 RJ-8 RJ-8 Package Description SOT-23-8 SOT-23-8 SOT-23-8 SOT-23-8 SOT-23-8 SOT-23-8 SOT-23-8 SOT-23-8 SOT-23-8 SOT-23-8 SOT-23-8 SOT-23-8 SOT-23-8 SOT-23-8 SOT-23-8 SOT-23-8 Evaluation Board Full Container Quantity 250 3000 250 3000 250 3000 250 3000 250 3000 250 3000 250 3000 250 3000 1 Branding D12 D12 D12 D12 D13 D13 D13 D13 D14 D14 D14 D14 D15 D15 D15 D15 Z = Pb-free part. The evaluation board is shipped with three pieces of 10 k parts. Users should order extra samples or different resistance options if needed. Purchase of licensed I2C components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. (c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D03437-0-1/04(0) Rev. 0 | Page 20 of 20