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MCP4021 датащи(PDF) 36 Page - Microchip Technology |
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MCP4021 датащи(HTML) 36 Page - Microchip Technology |
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36 / 64 page ![]() MCP4021/2/3/4 DS21945E-page 36 © 2006 Microchip Technology Inc. 5.2.7 HIGH-VOLTAGE INCREMENT AND ENABLE WiperLock TECHNOLOGY This mode is achieved by initializing the U/D pin to a high state (VIH) prior to the CS pin being driven to VIHH. Subsequent rising edges of the U/D pin increment the wiper setting toward terminal A. Set the U/D pin to the low state (VIL) prior to forcing the CS pin to VIH. This begins a write cycle and enables the WiperLock Technology feature (See Figure 5-7). After the CS pin is driven to VIH (from VIHH), all other serial commands are ignored until the EEPROM write cycle (tWC) completes. FIGURE 5-7: High-Voltage Increment and Enable WiperLock™ Technology. Note: The wiper value will not overflow. That is, once the wiper value equals 0x3F, subsequent increment commands are ignored. EEPROM U/D CS Wiper 1 2 3 4 WiperLock™ Technology WiperLock Technology Enable WiperLock Technology Disable X+1 X X+2 X+3 X+4 X XX X X X+4 VIHH VIH VIH 5 6 VIL VIH VIL tWC |
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