MCP4021 datasheet(34/64 Pages) MICROCHIP

34 / 64 page

MCP4021/2/3/4

DS21945E-page 34

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

Wiper

WiperLock™ Technology

WiperLock Technology Enable

WiperLock Technology Disable

X+4

VIH

VIL

tWC

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