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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) 34 Page - Microchip Technology |
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MCP4021 датащи(HTML) 34 Page - Microchip Technology |
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34 / 64 page  MCP4021/2/3/4 DS21945E-page 34 © 2006 Microchip Technology Inc. 5.2.5 WRITE WIPER SETTING TO EEPROM To write the current wiper setting to EEPROM, force both the CS pin and U/D pin to VIH. Then force the CS pin to VIL. Before there is a rising edge on the U/D pin, force the CS pin to VIH. This causes the wiper setting value to be written to EEPROM. When the CS pin is forced to VIH, the wiper value is written to the EEPROM. Therefore, if the device voltage is lowered below the RAM retention voltage of the device, once the device returns to the operating range, the wiper will be loaded with this wiper setting (stored in the EEPROM). 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 VIL), all other serial commands are ignored until the EEPROM write cycle (tWC) completes. FIGURE 5-5: Write Wiper Setting to EEPROM. Note: After the U/D pin is forced to VIL, each rising edge on the U/D pin will cause the wiper to increment. This is the same command as the “Incre- ment with Writing Wiper Setting to EEPROM“ command, but the U/D pin is held at VIL, so the wiper is not incre- mented. EEPROM U/D CS Wiper WiperLock™ Technology WiperLock Technology Enable WiperLock Technology Disable X+4 X X+4 VIH VIH VIH 5 6 VIL VIL tWC |
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