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WMS7140010M Datasheet(PDF) 7 Page - Winbond |
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WMS7140010M Datasheet(HTML) 7 Page - Winbond |
7 / 23 page WMS7140/1 Publication Release Date: April 21, 2005 - 7 - Revision 1.1 7. FUNCTIONAL DESCRIPTION The WMS7140/1, a nonvolatile digitally programmable potentiometers with 16 taps, with or without output buffer, is designed to operate as both a potentiometer or a variable resistor depending upon the output configuration selected. The chip can store up to one 8-bit word in a nonvolatile memory (NVMEM0) in order to set the tap register value when the device is powered up. The WMS7140/1 is controlled by a serial Up-Down (3-wire) interface that allows setting the tap register value as well as storing data in the nonvolatile memory. 7.1. POTENTIOMETER AND RHEOSTAT MODES The WMS7140/1 can operate as either a rheostat or as a potentiometer (voltage divider). When in the potentiometer configuration there are two possible modes. One is done using WMS7140 Winpot device without the output buffer and the other mode is done with WMS7141 WinPot device with the output buffer. 7.1.1. Rheostat Configuration The WMS7140/1 acts as a two terminal resistive element in the rheostat configuration where one terminal can be connected to either the end point pins of the resistor (VA and VB) and the other terminal is the wiper (VW) pin. This configuration controls the resistance between the two terminals and the resistance can be adjusted by sending the corresponding tap register setting to the WMS7140/1 or can also be set by loading a pre-set tap register value from nonvolatile memory NVMEM0 upon power up. 7.1.2. Potentiometer Configuration In potentiometer configuration an input voltage is applied to either one of the end point pins (VA or VB). The voltage on the wiper pin will be proportional to the voltage difference between VA and VB and the wiper setting. The resistance cannot be directly measured in this configuration. 7.2. NON-VOLATILE MEMORY (NVMEM) The WMS7140/1 has one NVMEM position available for storing the potentiometer setting. The NVMEM position can be directly written via the Up/Down interface. The potentiometer is loaded with the value stored in the NVMEM0 on power up. |
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