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X9455UV24-2.7 Datasheet(PDF) 9 Page - Intersil Corporation |
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X9455UV24-2.7 Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 18 page 9 FN8202.0 November 10, 2004 Up/Down Interface Operation The SCL, U/D, CS, DS0 and DS1 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 SCL inputs. HIGH to LOW transitions on SCL will increment or decrement (depending on the state of the U/D input) a wiper counter register selected by DS0 and DS1. The output of this counter is decoded to select one of 256 wiper positions along the resistor array. The value of the counter is stored in nonvolatile data register Level 0 of the corresponding WCR whenever CS transitions HIGH while the SCL and WP inputs are HIGH (See Table 1). During a “Store” operation bits WCRSel1 and WCRSel0 in the status register must be both “0”, which is their power up default value. Other combinations are reserved and must not be used. The system may select the X9455, move a wiper, and deselect the device without having to store the latest 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 SCL LOW while taking CS HIGH. The new wiper position is maintained until changed by the system or until a power-down/up 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 could be made. The adjustments might be based on user preference, 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 wiper up and down until the proper trim is attained. The 2-wire interface is disabled while CS remains LOW. *While in Standby, the 2-wire interface is enabled TABLE 1. DCP SELECTION FOR UP/DOWN CONTROL DS1 DS0 SELECTED WIPER CONTROL REGISTER 0 0 Wiper A of DCP0 1 1 Wiper B of DCP0 1 0 Wiper A of DCP1 0 1 Wiper B of DCP1 TABLE 2. MODE SELECTION FOR UP/DOWN CONTROL CS SCL U/D MODE L H Wiper Up L L Wiper Down H X Store Wiper Position to nonvolatile memory if WP pin is high. No store, return to standby, if WP pin is low. H X X Standby* L X No Store, Return to Standby L H Wiper Up (not recommended) L L Wiper Down (not recommended) X9455 |
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