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X9C103SI Datasheet(PDF) 8 Page - Intersil Corporation |
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X9C103SI Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 11 page 8 FN8222.1 September 19, 2005 INSTRUCTIONS AND PROGRAMMING The INC, U/D and CS inputs control the movement of the wiper along the resistor array. 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 seven-bit counter. The output of this counter is decoded to select one of one-hundred wiper positions along the resistive 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 X9Cxxx, move the wiper, and deselect the device without having to store the lat- est wiper position in nonvolatile memory. After the wiper 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 wiper position will be maintained until changed by the sys- tem or until a power-down/up cycle recalled the previ- ously 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 could be made. The adjustments might be based on user pref- erence: system parameter changes due to tempera- ture 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 wiper up and down until the proper trim is attained. MODE SELECTION SYMBOL TABLE CS INC U/D Mode L H Wiper Up L L Wiper Down H X Store Wiper Position H X X Standby Current L X No Store, Return to Standby L H Wiper Up (not recommended) L L Wiper Down (not recommended) WAVEFORM INPUTS OUTPUTS Must be steady Will be steady May change from Low to High Will change from Low to High May change from High to Low Will change from High to Low Don’t Care: Changes Allowed Changing: State Not Known N/A Center Line is High Impedance X9C102, X9C103, X9C104, X9C503 |
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