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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP4021 датащи(PDF) 26 Page - Microchip Technology |
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MCP4021 датащи(HTML) 26 Page - Microchip Technology |
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26 / 64 page  MCP4021/2/3/4 DS21945E-page 26 © 2006 Microchip Technology Inc. 3.6 Chip Select (CS) The CS pin is the chip select input. Forcing the CS pin to VIL enables the serial commands. These commands can increment and decrement the wiper. Depending on the command, the wiper may (or may not) be saved to non-volatile memeory (EEPROM). Forcing the CS pin to VIHH enables the high-voltage serial commands. These commands can increment and decrement the wiper and enable or disable the WiperLock technology. The wiper is saved to non-volatile memory (EEPROM). The CS pin has an internal pull-up resistor. The resistor will become “disabled” when the voltage on the CS pin is below the VIH level. This means that when the CS pin is “floating”, the CS pin will be pulled to the VIH level (serial communication (the U/D pin) is ignored). And when the CS pin is driven low (VIL), the resistance becomes very large to reduce the device current consumption when serial commands are occurring. See Figure 2-4 for additional information. 3.7 Increment/Decrement (U/D) The U/D pin input is used to increment or decrement the wiper on the digital potentiometer. An increment moves the wiper one step toward terminal A, while a decrement moves the wiper one step toward terminal B. |
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