MCP4021 datasheet(39/64 Pages) MICROCHIP

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39 / 64 page

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

Wiper

WiperLock™ Technology

X+4

WiperLock Technology Enable

WiperLock Technology Disable

VIHH

VIH

VIL

VIH

tWC

MCP4021 bảng dữ liệu(PDF) 39 Page - Microchip Technology