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X9252TV24I-2.7 Datasheet(PDF) 9 Page - Intersil Corporation |
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X9252TV24I-2.7 Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 19 page 9 FN8167.1 September 14, 2005 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 Registers DRi0 whenever CS transitions HIGH while the SCL and WP inputs are HIGH. “i” indicates the DCP number selected with pins DS1 and DS0. During a “Store” operation bits DRSel1 and DRSel0 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 X9252, move the 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 will be 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 temperate 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. Mode Selection for Up/Down Control 2-Wire Serial Interface Protocol Overview The device supports a bidirectional bus oriented protocol. The protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. The device controlling the transfer is called the master and the device being controlled is called the slave. The master always initiates data transfers, and provides the clock for both transmit and receive operations. The X9252 operates as a slave in all applications. All 2-wire interface operations must begin with a START, followed by a Slave Address byte. The Slave Address selects the X9252, and specifies if a Read or Write operation is to be performed. All Communication over the 2-wire interface is conducted by sending the MSB of each byte of data first. Serial Clock and Data Data states on the SDA line can change only while SCL is LOW. SDA state changes while SCL is HIGH are reserved for indicating START and STOP conditions (See Figure 2). On power up of the X9252, the SDA pin is in the input mode. Serial Start Condition All commands are preceded by the START condition, which is a HIGH to LOW transition of SDA while SCL is HIGH. The device continuously monitors the SDA and SCL lines for the START condition and does not respond to any command until this condition has been met (See Figure 2). Serial Stop Condition All communications must be terminated by a STOP condition, which is a LOW to HIGH transition of SDA while SCL is HIGH. The STOP condition is also used to place the device into the Standby power mode after a read sequence. A STOP condition can only be issued after the transmitting device has released the bus (See Figure 2). TABLE 1. DCP SELECTION FOR UP/DOWN CONTROL DS1 DS0 SELECTED DCP 00 DCP0 01 DCP1 10 DCP2 11 DCP3 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) X9252 |
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