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X9511 Datasheet(PDF) 4 Page - Intersil Corporation |
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X9511 Datasheet(HTML) 4 Page - Intersil Corporation |
4 / 9 page 4 FN8205.1 September 6, 2005 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- ory whenever the chip senses a power-down of VCC 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 hard wired to VSS. If ASE is held HIGH during power- 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. RTOTAL with VCC Removed The end to end resistance of the array will fluctuate once VCC is removed. Figure 1. Typical circuit with ASE store pin controlled by push button switch Figure 2. Typical circuit with ASE store pin used in AUTOSTORE mode 3 5 6 8 1 2 7 VCC 2k Ω VCC PU PD ASE VH VW VL VSS 4 3 5 8 1 2 7 VCC VCC PU PD ASE VSS VH VW VL 3.3µF 6 X9511 |
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