MCP4021 datasheet(30/64 Pages) MICROCHIP

30 / 64 page

MCP4021/2/3/4

DS21945E-page 30

5.2.1

INCREMENT WITHOUT WRITING

WIPER SETTING TO EEPROM

This mode is achieved by initializing the U/D pin to a

high state (VIH) prior to achieving a low state (VIL) on the

CS pin. Subsequent rising edges of the U/D pin

increment the wiper setting toward terminal A. This is

shown in Figure 5-1.

After the wiper is incremented to the desired position,

the CS pin should be forced to VIH to ensure that

“unexpected” transitions (on the U/D pin do not cause

the wiper setting to increment. Driving the CS pin to VIH

should occur as soon as possible (within device

specifications) after the last desired increment occurs.

The EEPROM value has not been updated to this new

wiper value, so 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 the wiper setting in the EEPROM.

After the CS pin is driven to VIH (from VIL), any other

serial command may immediately be entered. This is

since an EEPROM write cycle (twc) is not active.

FIGURE 5-1:

Increment without Writing Wiper Setting to EEPROM.

Note:

The wiper value will not overflow. That is,

once the wiper value equals 0x3F,

subsequent increment commands are

ignored.

EEPROM

U/D

Wiper

WiperLock™ Technology

WiperLock Technology Enable

WiperLock Technology Disable

X+1

X+2

X+3

X+4

Note: If WiperLock technology enabled, wiper will not move.

VIH

VIL

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