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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) 39 Page - Microchip Technology |
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MCP4021 датащи(HTML) 39 Page - Microchip Technology |
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39 / 64 page  © 2006 Microchip Technology Inc. DS21945E-page 39 MCP4021/2/3/4 5.2.10 WRITE WIPER SETTING TO EEPROM AND DISABLE WiperLock TECHNOLOGY This mode is achieved by keeping the U/D pin static (either at VIL or at VIH), while the CS pin is driven from VIH to VIHH and then returned to VIH. When the falling edge of the CS pin occurs (from VIHH to VIH), the wiper value is written to EEPROM and the WiperLock Technology is disabled (See Figure 5-10). To ensure that “unexpected” transitions on the U/D pin do not cause the wiper setting to change, force the CS pin to VIH as soon as possible (within device specifications) after the CS pin is forced to VIHH. After the CS pin is driven to VIH (from VIHH), all other serial commands are ignored until the EEPROM write cycle (tWC) completes. FIGURE 5-10: Write Wiper Setting to EEPROM and Disable WiperLock™ Technology. EEPROM U/D CS Wiper WiperLock™ Technology X+4 X X+4 WiperLock Technology Enable WiperLock Technology Disable VIHH VIH VIL VIH VIH tWC |
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