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X9514WS Datasheet(PDF) 3 Page - Xicor Inc. |
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X9514WS Datasheet(HTML) 3 Page - Xicor Inc. |
3 / 11 page X9514 3 DEVICE OPERATION There are three sections of the X9514: the input control, counter and decode section; the E2PROM memory; and the resistor array. The input control section operates just like an up/down counter. The output of this counter is decoded to turn on a single electronic switch connecting a point on the resistor array to the wiper output. Under the proper conditions the contents of the counter can be stored in E2PROM memory and retained for future use. The resistor array is comprised of 31 individual resistors connected in series. At either end of the array and between each resistor is an electronic switch that trans- fers the potential at that point to the wiper. The X9514 is designed to interface directly to two push button switches for effectively moving the wiper up or down. The PU and PD inputs increment or decrement a 5-bit counter respectively. The output of this counter is decoded to select one of the thirty-two wiper positions along the resistive array. The wiper increment input, PU and the wiper decrement input, PD are both connected to an internal pull-up so that they normally remain HIGH. When pulled LOW by an external push button switch or a logic LOW level input, the wiper will be switched to the next adjacent tap position. Internal debounce circuitry prevents inadvertent switch- ing of the wiper position if PU or PD remain LOW for less than 40ms, typical. Each of the buttons can be pushed either once for a single increment/decrement or continu- ously for a multiple increments/decrements. The num- ber of increments/decrements of the wiper position depend on how long the button is being pushed. When making a continuous push, after the first second, the increment/decrement speed increases. For the first second the device will be in the slow scan mode. Then if the button is held for longer than 1 second the device will be in the fast scan mode. As soon as the button is released the X9514 will return to a standby condition. 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 E2PROM memory whenever the chip senses a powers-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. VCC VCC PU PD ASE VSS VH VW VL 3.3µF 8 1 2 7 4 3 5 6 6487 ILL F05.2 VCC PU PD ASE VH VW VL VSS 8 1 2 7 3 5 6 6487 ILL F05a VCC Typical circuit with ASE store pin controlled by push button switch Typical circuit with ASE store pin used in AUTOSTORE mode |
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