MCP4021 datasheet(40/64 Pages) MICROCHIP

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MCP4021/2/3/4

DS21945E-page 40

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

Wiper

WiperLock™ Technology

X+4

WiperLock Technology Enable

WiperLock Technology Disable

VIHH

VIH

VIL

tWC

MCP4021 bảng dữ liệu(PDF) 40 Page - Microchip Technology