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X90100MI Datasheet(PDF) 8 Page - Xicor Inc. |
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X90100MI Datasheet(HTML) 8 Page - Xicor Inc. |
8 / 10 page X90100 8 of 10 REV 1.4.7 9/8/03 www.xicor.com When the device is powered-down, the last counter position stored will be maintained in the nonvolatile memory. When power is restored, the contents of the memory are recalled and the capacitor is set to the value last stored. INSTRUCTIONS AND PROGRAMMING The INC, U/D and CS inputs control the movement of the capacitor total value. With CS set LOW the device is selected and enabled to respond to the U/D and INC inputs. HIGH to LOW transitions on INC will increment or decrement (depending on the state of the U/D input) a five bit counter. The output of this counter is decoded to select one of thirty two capacitor combinations for the capacitor array. The value of the counter is stored in nonvolatile mem- ory whenever CS transitions HIGH while the INC input is also HIGH. The system may select the X90100, move the capaci- tor value and deselect the device without having to store the latest count total in nonvolatile memory. After the count movement is performed as described above and once the new position is reached, the system must keep INC LOW while taking CS HIGH. The new CTO- TAL value will be maintained until changed by the sys- tem or until a power-up/down cycle recalled the previously stored data. This procedure allows the system to always power-up to a preset value stored in nonvolatile memory; then during system operation minor adjustments can be made. The adjustments might be based on user prefer- ence, system parameter changes due to temperature drift, etc. The state of U/D may be changed while CS remains LOW. This allows the host system to enable the device and then move the counter up and down until the proper trim is attained. MODE SELECTION CS INC U/D Mode L H Cap value Up L L Cap value Down H X Store Cap Position H X X Standby Current L X No Store, Return to Standby L H Cap value Up (not recommended) L L Cap value Down (not recommended) TABLE OF VALUES Single-Ended Mode Differential Mode COUT = Code 31 • 7.0 + 7.5 (pF) 0 ≤ Code ≤ 31 COUT = Code • 0.35 + 1.00 (pF) 0 ≤ Code ≤ 31 Cp Cm X90100 X1 X2 Oscillator Circuit Cp Cm X90100 Oscillator Circuit Cp Cs Example of a single-ended circuit Example of a differential mode circuit |
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