Intersil’s non-volatile 3-wire “Up/Down” interface DCPs recall the wiper position from internal EEPROM on power up. To change the wiper position and to store a new default wiper setting, they use INC, U/D, and CS pins. The INC and CS signals are also NORed together, internally, to generate an enable signal for the internal wiper decoder as shown in Figure 1. Casual treatment of the INC and CS control signals on power-up can lead to inadvertent store operations,“walking wipers” and other unexpected results.
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