256-Position, Two-Time Programmable, 2 I C Digital Potentiometer AD5170 FEATURES FUNCTIONAL BLOCK DIAGRAM A W B 256-position digital potentiometer Two-time programmable (TTP) set-and-forget resistance setting allows second-chance permanent programming Unlimited adjustments prior to one-time programming (OTP) activation FUSE V DD OTP overwrite allows dynamic adjustments with user- LINKS 12 defined preset RDAC End-to-end resistance: 2.5 k, 10 k, 50 k, 100 k GND REGISTER Compact 10-lead MSOP: 3 mm 4.9 mm package Fast settling time: t = 5 s typical in power-up S AD0 ADDRESS 8 Full read/write of wiper register DECODE AD1 Power-on preset to midscale SDA Extra package address decode pins: AD0 and AD1 SERIAL INPUT REGISTER SCL Single supply: 2.7 V to 5.5 V Low temperature coefficient: 35 ppm/C Figure 1. Low power: I = 6 A maximum DD Wide operating temperature: 40C to +125C Evaluation board and software are available Software replaces MicroConverter in factory programming applications APPLICATIONS Systems calibration Electronics level setting Mechanical trimmers replacement in new designs Permanent factory PCB settings Transducer adjustment of pressure, temperature, position, chemical, and optical sensors RF amplifier biasing Automotive electronics adjustments Gain control and offset adjustments GENERAL DESCRIPTION activation, a permanent blow fuse command freezes the wiper The AD5170 is a 256-position, two-time programmable, digital 1 position (analogous to placing epoxy on a mechanical trimmer). potentiometer that employs fuse link technology, giving users two opportunities to permanently program the resistance setting. Unlike traditional OTP digital potentiometers, the AD5170 has For users who do not need to program the digital potentiometer a unique temporary OTP overwrite feature that allows for new setting in memory more than once, the OTP feature is a cost- adjustments even after the fuse is blown. However, the OTP setting effective alternative to EEMEM. The AD5170 performs the same is restored during subsequent power-up conditions. This feature electronic adjustment function as mechanical potentiometers or allows users to treat these digital potentiometers as volatile poten- variable resistors with enhanced resolution, solid-state reliability, tiometers with a programmable preset. and superior low temperature coefficient performance. For applications that program the AD5170 at the factory, Analog 2 The AD5170 is programmed using a 2-wire, I C-compatible Devices, Inc., offers device programming software that runs on digital interface. Unlimited adjustments are allowed before Windows NT, Windows 2000, and Windows XP operating permanently setting the resistance value, and there are two 2 systems. This software effectively replaces any external I C con- opportunities for permanent programming. During OTP trollers, thus enhancing the time-to-market of the users systems. 1 The terms digital potentiometer, VR, and RDAC are used interchangeably. Rev. G 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20032011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 04104-0-001AD5170 TABLE OF CONTENTS Features .............................................................................................. 1 Programming the Potentiometer DividerVoltage Output Operation .................................................................................... 16 Applications....................................................................................... 1 ESD Protection ........................................................................... 17 Functional Block Diagram .............................................................. 1 Terminal Voltage Operating Range ......................................... 17 General Description ......................................................................... 1 Power-Up Sequence ................................................................... 17 Revision History ............................................................................... 2 Power Supply Considerations................................................... 17 Specifications..................................................................................... 4 Layout Considerations............................................................... 18 Electrical Characteristics: 2.5 k ............................................... 4 Controlling the AD5170................................................................ 19 Electrical Characteristics: 10 k, 50 k, and 100 k ............. 5 Software Programming ............................................................. 19 Timing Characteristics: 2.5 k, 10 k, 50 k, and 100 k... 7 Device Programming................................................................. 19 Absolute Maximum Ratings............................................................ 8 2 I C Controller Programming.................................................... 21 ESD Caution.................................................................................. 8 2 I C-Compatible, 2-Wire Serial Bus.......................................... 21 Pin Configuration and Function Descriptions............................. 9 Level Shifting for Different Voltage Operation ...................... 22 Typical Performance Characteristics ........................................... 10 Outline Dimensions....................................................................... 23 Test Circuits..................................................................................... 14 Ordering Guide .......................................................................... 23 Theory of Operation ...................................................................... 15 One-Time Programming (OTP) .............................................. 15 Programming the Variable Resistor and VoltageRheostat Operation..................................................................................... 15 REVISION HISTORY 1/08Rev. B to Rev. C 5/11Rev. F to Rev. G Changes to Equation 1 and Equation 2 ....................................... 16 Updated Format..................................................................Universal Updated Outline Dimensions ....................................................... 23 Changes to Table 1.............................................................................3 Changes to Ordering Guide .......................................................... 23 Changes to Table 2.............................................................................4 2 Changes to I C Notice.................................................................... 24 Changes to Table 3.............................................................................6 Changes to Table 5.............................................................................8 5/09Rev. E to Rev. F Inserted Figure 25........................................................................... 12 Changes to Resistor Integral Nonlinearity, Table 1...................... 3 Changes to One-Time Programming (OTP) Section................ 14 Changes to Full-Scale Error, Table 1 .............................................. 3 Changes to Power Supply Considerations Section .................... 16 Changes to Zero-Scale Error, Table 1............................................. 3 Deleted Figure 38 and Figure 39 .................................................. 17 Changes to Table 10........................................................................ 19 Updated Outline Dimensions....................................................... 21 Changes to Figure 46...................................................................... 20 Changes to Ordering Guide .......................................................... 21 12/08Rev. D to Rev. E 5/05Rev. A to Rev. B Changes to Resistor Integral Nonlinearity, Table 1...................... 3 Changes to Table 1.............................................................................3 Changes to OTP Supply Voltage Parameter, Table 1.................... 3 Changes to Table 2.............................................................................5 Changes to OTP Voltage Parameter, Table 2 ................................ 5 Changes to Pin Function Descriptions...........................................9 Changes to Table 5............................................................................ 8 Changes to Figure 28...................................................................... 14 Changes to One-Time Programming (OTP) Section................ 14 Changes to Power Supply Considerations Section .................... 17 Changes to Power Supply Considerations Section..................... 16 Changes to I2C-Compatible 2-Wire Serial Bus Section............ 21 Change to Caption, Figure 49 ....................................................... 22 Added Level Shifting for Different Voltage Operation Changes to Ordering Guide .......................................................... 22 Section.............................................................................................. 23 Added Figure 48 ............................................................................. 23 Updated Outline Dimensions....................................................... 24 7/08Rev. C to Rev. D Changes to Power Supplies Parameter in Table 1 and Table 2 ... 3 Changes to Ordering Guide .......................................................... 24 Updated Fuse Blow Condition to 400 ms Throughout ............... 5 Rev. G Page 2 of 24