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AD5222 Fiches technique(PDF) 1 Page - Analog Devices |
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AD5222 Fiches technique(HTML) 1 Page - Analog Devices |
1 / 20 page 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. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD5232 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 © Analog Devices, Inc., 2001 * 8-Bit Dual Nonvolatile Memory Digital Potentiometer FEATURES Nonvolatile Memory Preset Maintains Wiper Settings Dual Channel, 256-Position Resolution Full Monotonic Operation DNL < 1 LSB 10 k , 50 k , 100 k Terminal Resistance Linear or Log Taper Settings Push-Button Increment/Decrement Compatible SPI-Compatible Serial Data Input with Readback Function 3 V to 5 V Single Supply or 2.5 V Dual Supply Operation 14 Bytes of User EEMEM Nonvolatile Memory for Constant Storage Permanent Memory Write Protection 100-Year Typical Data Retention TA = 55 C APPLICATIONS Mechanical Potentiometer Replacement Instrumentation: Gain, Offset Adjustment Programmable Voltage-to-Current Conversion Programmable Filters, Delays, Time Constants Line Impedance Matching Power Supply Adjustment DIP Switch Setting GENERAL DESCRIPTION The AD5232 device provides a nonvolatile, dual-channel, digitally controlled variable resistor (VR) with 256-position resolution. These devices perform the same electronic adjust- ment function as a potentiometer or variable resistor. The AD5232’s versatile programming via a microcontroller allows multiple modes of operation and adjustment. In the direct program mode a predetermined setting of the RDAC register can be loaded directly from the microcontroller. Another key mode of operation allows the RDAC register to be refreshed with the setting previously stored in the EEMEM register. When changes are made to the RDAC register to estab- lish a new wiper position, the value of the setting can be saved into the EEMEM by executing an EEMEM save operation. Once the settings are saved in the EEMEM register these values will be automatically transferred to the RDAC register to set the wiper position at system power ON. Such operation is enabled by the internal preset strobe and the preset can also be accessed externally. All internal register contents can be read out of the serial data output (SDO). This includes the RDAC1 and RDAC2 registers, the corresponding nonvolatile EEMEM1 and EEMEM2 regis- ters, and the 14 spare USER EEMEM registers available for constant storage. *Patent pending. FUNCTIONAL BLOCK DIAGRAM RDAC1 REGISTER EEMEM1 RDAC2 REGISTER EEMEM CONTROL 14 BYTES USER EEMEM EEMEM2 AD5232 RDAC1 RDAC2 CS CLK WP PR SDI GND SDO RDY SDO SERIAL INTERFACE ADDR DECODE VDD VSS A1 W1 B1 A2 W2 B2 SDI The basic mode of adjustment is the increment and decrement command controlling the present setting of the Wiper position setting (RDAC) register. An internal scratch pad RDAC register can be moved UP or DOWN one step of the nominal terminal resistance between terminals A and B. This linearly changes the wiper to B terminal resistance (RWB) by one position segment of the devices’ end-to-end resistance (RAB). For exponential/loga- rithmic changes in wiper setting, a left/right shift command adjusts levels in ±6 dB steps, which can be useful for audio and light alarm applications. The AD5232 is available in a thin TSSOP-16 package. All parts are guaranteed to operate over the extended industrial tempera- ture range of –40 °C to +85°C. An evaluation board is available, Part Number: AD5232EVAL. CODE – Decimal 100 75 0 0 256 64 128 192 50 25 RWB RWA Figure 1. Symmetrical RDAC Operation |
Numéro de pièce similaire - AD5222 |
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Description similaire - AD5222 |
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