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X90100MI Datasheet(PDF) 7 Page - Xicor Inc. |
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X90100MI Datasheet(HTML) 7 Page - Xicor Inc. |
7 / 10 page 7 of 10 REV 1.4.7 9/8/03 www.xicor.com X90100 PIN CONFIGURATION DETAILED PIN DESCRIPTIONS Cp and Cm The high (Cp) and low (Cm) terminals of the X90100 are equivalent to the fixed terminals of a mechanical trimmable capacitor. The minimum dc voltage is VSS and the maximum is VCC. The value of capacitance across the terminals is determined by digital inputs INC, U/D, and CS. Up/Down (U/D) The U/D input controls the direction of the trimmed capacitor value and whether the counter is incre- mented or decremented. This pin has an active current source pullup. Increment (INC) The INC input is negative-edge triggered. Toggling INC will move the capacitance value and either increment or decrement the counter in the direction indicated by the logic level on the U/D input. This pin has an active current source pullup. Chip Select (CS) The device is selected when the CS input is LOW. The current counter value is stored in nonvolatile memory when CS is returned HIGH while the INC input is also HIGH. After the store operation is complete the X90100 will be placed in the low power standby mode until the device is selected once again. This pin has active circuit source pullup. N/C - This pin should be left floating. PIN NAMES PRINCIPLES OF OPERATION There are three sections of the X90100: the input con- trol, counter and decode section; the nonvolatile mem- ory; and the capacitor array. The input control section operates just like an up/down counter. The output of this counter is decoded to turn on electronic switches connecting internal units to the sum capacitor. Under the proper conditions the contents of the counter can be stored in nonvolatile memory and retained for future use. The capacitor array is comprised of 31 individual capacitors connected in parallel. At one end of each element is an electronic switch that connects it to the sum. The capacitor, when at either end of the range, 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 counter changes positions. If the counter is moved several positions, multiple units are connected to the total for tIW (INC to CTOTAL change). The CTOTAL value for the device can temporarily be increased by a significant amount if the counter is moved several positions. VCC CS INC U/D 1 2 3 4 8 7 6 5 X90100 MSOP N/C (leave floating) Cm Vss Cp Symbol Default Description Cp output Positive capacitor terminal Cm output Negative capacitor terminal VSS supply Ground VCC supply Positive supply voltage U/D pull up Up/Down control input INC pull up Increment control input CS pull up Chip Select control input |
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