4

FN8205.3

February 2, 2007

The wiper, when at either fixed terminal, acts like its

mechanical equivalent and does not move beyond the

last position. That is, the counter does not wrap

around when clocked to either extreme.

AUTOSTORE

The value of the counter is stored in EEPROM mem-

while ASE is enabled (held LOW). When power is

restored, the content of the memory is recalled and the

counter reset to the last value stored.

If AUTOSTORE is to be implemented, ASE is typically

up and then taken LOW, the wiper will not respond to

the PU or PD inputs until ASE is brought HIGH and

held HIGH.

Manual (Push Button) Store

When ASE is not enabled (held HIGH) a push button

switch may be used to pull ASE LOW and released to

perform a manual store of the wiper position.

The end to end resistance of the array will fluctuate

3

5

6

8

1

2

7

2k

Ω

PU

PD

ASE

FIGURE 1. TYPICAL CIRCUIT WITH ASE STORE

CONTROLLED BY PUSH BUTTON SWITCH

4

3

5

8

1

2

7

PU

PD

ASE

3.3µF

6

FIGURE 2. TYPICAL CIRCUIT WITH ASE STORE PIN USED

IN AUTOSTORE MODE

X9511