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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) 40 Page - Microchip Technology |
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MCP4021 датащи(HTML) 40 Page - Microchip Technology |
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40 / 64 page  MCP4021/2/3/4 DS21945E-page 40 © 2006 Microchip Technology Inc. 5.2.11 WRITE WIPER SETTING TO EEPROM AND ENABLE WiperLock TECHNOLOGY This mode is achieved by initializing the U/D and CS pins to a high state (VIH) prior to the CS pin being driven to VIHH (from VIH). Set the U/D pin to a low state (VIL) prior to forcing the CS pin to VIH (from VIHH). This begins a write cycle and enables the WiperLock Technology feature (See Figure 5-11). To ensure that “unexpected” transitions on the U/D pin do not cause the wiper setting to increment, force the CS pin to VIH as soon as possible (within device specifications) after the U/D pin is forced to VIL. After the CS pin is driven to VIH (from VIHH), all other serial commands are ignored until the EEPROM write cycle (tWC) completes. FIGURE 5-11: Write Wiper Setting to EEPROM and Enable WiperLock™ Technology. EEPROM U/D CS Wiper WiperLock™ Technology X+4 X X+4 WiperLock Technology Enable WiperLock Technology Disable VIHH VIH VIH VIH VIL tWC |
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