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X9511WSIZ Datasheet(PDF) 3 Page - Intersil Corporation |
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X9511WSIZ Datasheet(HTML) 3 Page - Intersil Corporation |
3 / 9 page 3 FN8205.3 February 2, 2007 PIN DESCRIPTIONS VH/RH and VL/RL The high (VH/RH) and low (VL/RL) terminals of the X9511 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is - 5V and the maximum is +5V. It should be noted that the terminology of VL/RL and VH/RH are in reference to the relative position of the terminal in relation to wiper movement direction selected by the PU and PD inputs, and not the voltage potential on the terminal. PU The debounced PU input is for incrementing the wiper position. An on-chip pull-up holds the PU input HIGH. A switch closure to ground or a LOW logic level will, after a debounce time, move the wiper to the next adjacent higher tap position. PD The debounced PD input is for decrementing the wiper position. An on-chip pull-up holds the PD input HIGH. A switch closure to ground or a LOW logic level will, after a debounce time, move the wiper to the next adjacent lower tap position. ASE The debounced ASE (AUTOSTORE enable) pin can be in one of two states: VIL - AUTOSTORE is enabled. When VCC powers down, an automatic store cycle takes place. VIH - AUTOSTORE is disabled. A LOW to HIGH will initiate a manual store operation. This is for the user who wishes to connect a push button switch to this pin. For every valid push, the X9511 will store the current wiper position to the EEPROM. PIN CONFIGURATION PIN NAMES DEVICE OPERATION There are three sections of the X9511: the input control, counter and decode section; the EEPROM memory; and the resistor array. The input control section oper- ates 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 out- put. Under the proper conditions the contents of the counter can be stored in EEPROM 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 elec- tronic switch that transfers the potential at that point to the wiper. The X9511 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 posi- tions 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 switching 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/dec- rement or continuously for a multiple increments/dec- rements. The number 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 go into the fast scan mode. As soon as the button is released the X9511 will return to a standby condition. VH VCC PU PD 1 2 3 4 8 7 6 5 X9511 DIP/SOIC VSS ASE VL VW SYMBOL DESCRIPTION VH/RH High Terminal VW/RW Wiper Terminal VL/RL Low Terminal VSS Ground VCC Supply Voltage PU Push Up Input PD Push Down Input ASE AUTOSTORE Enable Input X9511 |
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