MCP4011-103ESLASHMS datasheet(33/60 Pages) MICROCHIP

33 / 60 page

DS21978C-page 33

MCP4011/2/3/4

5.2.4

DECREMENT (FOR MCP402X

COMPATIBILITY)

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

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

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

decrement the wiper setting toward terminal B. This is

shown in Figure 5-4.

After the wiper is decremented to the desired position,

the U/D pin should remain high (VIH), and 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.

When the device voltage falls below the RAM retention

voltage of the device, the wiper state may be corrupted.

When the device returns to the operating range, the

wiper will be loaded with the default POR wiper setting.

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

serial command may immediately be entered.

FIGURE 5-4:

Decrement (For MCP402X Compatibility).

Note:

This command allows compatibility with

the MCP402X family, which supports

updating of the non-volatile wiper setting.

Note:

The wiper value will not underflow. That is,

once the wiper value equals 0x00,

subsequent decrement commands are

ignored.

U/D

Wiper

X-1

X-2

X-3

X-4

VIH

VIL

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