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X9C103P Datasheet(PDF) 6 Page - Intersil Corporation |
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X9C103P Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 10 page 6 FN8222.3 July 20, 2009 AC Timing Diagram Pin Descriptions RH/VH and RL/VL The high (VH/RH) and low (V L /R L ) terminals of the ISLX9C102, X9C103, X9C104, X9C503 are equivalent to the fixed terminals of a mechanical potentiometer. The minimum voltage is -5V and the maximum is +5V. The terminology of VH/RH and V L /R L references the relative position of the terminal in relation to wiper movement direction selected by the U/D input and not the voltage potential on the terminal. RW/VW VW/RW is the wiper terminal, and is equivalent to the movable terminal of a mechanical potentiometer. The position of the wiper within the array is determined by the control inputs. The wiper terminal series resistance is typically 40 Ω. Up/Down (U/D) The U/D input controls the direction of the wiper movement and whether the counter is incremented or decremented. Increment (INC) The INC input is negative-edge triggered. Toggling INC will move the wiper and either increment or decrement the counter in the direction indicated by the logic level on the U/D input. Chip Select (CS) The device is selected when the CS input is LOW. The current counter value is stored in non-volatile memory when CS is returned HIGH while the INC input is also HIGH. After the store operation is complete the ISLX9C102, X9C103, X9C104, X9C503 device will be placed in the low power standby mode until the device is selected once again. Principles of Operation There are three sections of the X9C102, X9C103, ISL9C104 and ISL9C503: the input control, counter and decode section; the non-volatile 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 non-volatile memory and retained for future use. The resistor array is comprised of 99 individual resistors connected in series. At either end of the array and between each resistor is an electronic switch that transfers the potential at that point to the wiper. 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. The electronic switches on the device operate in a “make-before-break” mode when the wiper changes tap positions. If the wiper is moved several positions, multiple taps are connected to the wiper for tIW (INC to VW/RW change). The RTOTAL value for the device can temporarily be reduced by a significant amount if the wiper is moved several positions. When the device is powered-down, the last wiper position stored will be maintained in the non-volatile memory. When power is restored, the contents of the memory are recalled and the wiper is reset to the value last stored. The internal charge pump allows a wide range of voltages (from -5V to 5V) applied to XDCP terminals yet given a convenience of single power supply. The typical charge pump noise of 20mV at 850kHz should be taken in consideration when designing an application circuit. CS INC U/D VW tCI tIL tIH tCYC tID tDI tIW MI tIC tCPH tF tR 10% 90% 90% (NOTE) NOTE: MI REFERS TO THE MINIMUM INCREMENTAL CHANGE IN THE VW OUTPUT DUE TO A CHANGE IN THE WIPER POSITION. X9C102, X9C103, X9C104, X9C503 |
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