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AD5170EVAL Datasheet(PDF) 1 Page - Analog Devices |
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AD5170EVAL Datasheet(HTML) 1 Page - Analog Devices |
1 / 24 page 256-Position Two-Time Programmable I2C Digital Potentiometer AD5170 Rev. A 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 © 2004 Analog Devices, Inc. All rights reserved. FEATURES 256-position TTP (two-time programmable) set-and-forget resistance setting allows second-chance permanent programming Unlimited adjustments prior to OTP (one-time programming) activation OTP overwrite allows dynamic adjustments with user defined preset End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ Compact MSOP-10 (3 mm × 4.9 mm) package Fast settling time: tS = 5 µs typ in power-up Full read/write of wiper register Power-on preset to midscale Extra package address decode pins AD0 and AD1 Single-supply 2.7 V to 5.5 V Low temperature coefficient: 35 ppm/°C Low power, IDD = 6 µA maximum Wide operating temperature: –40°C to +125°C Evaluation board and software are available Software replaces µC in factory programming applications APPLICATIONS Systems calibration Electronics level setting Mechanical Trimmers® replacement in new designs Permanent factory PCB setting Transducer adjustment of pressure, temperature, position, chemical, and optical sensors RF amplifier biasing Automotive electronics adjustment Gain control and offset adjustment GENERAL OVERVIEW The AD5170 is a 256-position, two-time programmable (TTP) digital potentiometer1 that employs fuse link technology to enable two opportunities at permanently programming the resistance setting. OTP is a cost-effective alternative to EEMEM for users who do not need to program the digital potentiometer setting in memory more than once. This device performs the same electronic adjustment function as mechanical potentiometers or variable resistors with enhanced resolution, solid-state reliability, and superior low temperature coefficient performance. FUNCTIONAL BLOCK DIAGRAM VDD GND SDA SCL AD0 AD1 W RDAC REGISTER ADDRESS DECODE SERIAL INPUT REGISTER B A FUSE LINKS 12 / 8 Figure 1. The AD5170 is programmed using a 2-wire, I2C® compatible digital interface. Unlimited adjustments are allowed before permanently (there are actually two opportunities) setting the resistance value. During OTP activation, a permanent blow fuse command freezes the wiper position (analogous to placing epoxy on a mechanical trimmer). Unlike traditional OTP digital potentiometers, the AD5170 has a unique temporary OTP overwrite feature that allows for new adjustments even after the fuse has been blown. However, the OTP setting is restored during subsequent power-up conditions. This feature allows users to treat these digital potentiometers as volatile potentiometers with a programmable preset. For applications that program the AD5170 at the factory, Analog Devices offers device programming software running on Windows NT®, 2000, and XP® operating systems. This software effectively replaces any external I2C controllers, thus enhancing the time-to-market of the user’s systems. 1 The terms digital potentiometer, VR, and RDAC are used interchangeably. |
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