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AD5232BRUZ100 Datenblatt(PDF) 1 Page - Analog Devices |
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AD5232BRUZ100 Datenblatt(HTML) 1 Page - Analog Devices |
1 / 24 page Nonvolatile Memory, Dual 256-Position Digital Potentiometer Data Sheet AD5232 Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2001–2013 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Dual-channel, 256-position resolution 10 kΩ, 50 kΩ, and 100 kΩ nominal terminal resistance Nonvolatile memory maintenance of wiper settings Predefined linear increment/decrement instructions Predefined ±6 dB step log taper increment/decrement instructions SPI-compatible serial interface Wiper settings and EEMEM readback 3 V to 5 V single-supply operation ±2.5 V dual-supply operation 14 bytes of general-purpose user EEMEM Permanent memory write protection 100-year typical data retention (TA = 55°C) APPLICATIONS Mechanical potentiometer replacement Instrumentation: gain and offset adjustment Programmable voltage-to-current conversion Programmable filters, delays, and time constants Programmable power supply Low resolution DAC replacement Sensor calibration FUNCTIONAL BLOCK DIAGRAM RDAC2 RDAC1 REGISTER EEMEM1 RDAC2 REGISTER EEMEM2 14 BYTES USER EEMEM RDAC1 ADDR DECODE SERIAL INTERFACE POWER-ON RESET EEMEM CONTROL AD5232 VDD VSS GND A1 W1 B1 A2 W2 B2 RDY WP PR SDO SDI CLK CS Figure 1. GENERAL DESCRIPTION The AD5232 device provides a nonvolatile, dual-channel, digitally controlled variable resistor (VR) with 256-position resolution. This device performs the same electronic adjustment function as a mechanical potentiometer with enhanced resolution, solid state reliability, and superior low temperature coefficient performance. The versatile programming of the AD5232, per- ormed via a microcontroller, allows multiple modes of operation and adjustment. In the direct program mode, a predetermined setting of the RDAC registers (RDAC1 and RDAC2) can be loaded directly from the microcontroller. Another important mode of operation allows the RDACx register to be refreshed with the setting previously stored in the corresponding EEMEM register (EEMEM1 and EEMEM2). When changes are made to the RDACx register to establish a new wiper position, the value of the setting can be saved into the EEMEMx register by executing an EEMEM save operation. After the settings are saved in the EEMEMx register, these values are automatically transferred to the RDACx register to set the wiper position at system power-on. Such operation is enabled by the internal preset strobe. The preset strobe can also be accessed externally. All internal register contents can be read via the serial data output (SDO). This includes the RDAC1 and RDAC2 registers, the corresponding nonvolatile EEMEM1 and EEMEM2 registers, and the 14 spare USER EEMEM registers that are available for constant storage. The basic mode of adjustment is the increment and decrement command instructions that control the wiper position setting register (RDACx). An internal scratch pad RDACx register can be moved up or down one step of the nominal resistance between Terminal A and Terminal B. This step adjustment linearly changes the wiper to Terminal B resistance (RWB) by one position segment of the device’s end-to-end resistance (RAB). For exponential/ logarithmic changes in wiper setting, a left/right shift command instruction adjusts the levels in ±6 dB steps, which can be useful for audio and light alarm applications. The AD5232 is available in a thin, 16-lead TSSOP package. All parts are guaranteed to operate over the extended industrial temperature range of −40°C to +85°C. An evaluation board, the EVAL-AD5232-10EBZ, is available. |
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Ähnliche Beschreibung - AD5232BRUZ100 |
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