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X9421YSI Datasheet(PDF) 4 Page - Xicor Inc. |
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X9421YSI Datasheet(HTML) 4 Page - Xicor Inc. |
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4 / 21 page  X9421 REV 1.1.6 8/1/02 Characteristics subject to change without notice. 4 of 21 www.xicor.com PIN DESCRIPTIONS Host Interface Pins Serial Output (SO) SO is a push/pull serial data output pin. During a read cycle, data is shifted out on this pin. Data is clocked out by the falling edge of the serial clock. Serial Input SI is the serial data input pin. All opcodes, byte addresses and data to be written to the potentiometer and pot register are input on this pin. Data is latched by the rising edge of the serial clock. Serial Clock (SCK) The SCK input is used to clock data into and out of the X9421. Chip Select (CS) When CS is HIGH, the X9421 is deselected and the SO pin is at high impedance, and (unless an internal write cycle is underway) the device will be in the standby state. CS LOW enables the X9421, placing it in the active power mode. It should be noted that after a power-up, a HIGH to LOW transition on CS is required prior to the start of any operation. Hold (HOLD) HOLD is used in conjunction with the CS pin to select the device. Once the part is selected and a serial sequence is underway, HOLD may be used to pause the serial communication with the controller without resetting the serial sequence. To pause, HOLD must be brought LOW while SCK is LOW. To resume communication, HOLD is brought HIGH, again while SCK is LOW. If the pause feature is not used, HOLD should be held HIGH at all times. Device Address (A0) The address input is used to set the least significant bit of the 8-bit slave address. A match in the slave address serial data stream must be made with the address input in order to initiate communication with the X9421. A maximum of 2 devices may occupy the SPI serial bus. Potentiometer Pins VH/RH, VL/RL The VH/RH and VL/RL inputs are equivalent to the terminal connections on either end of a mechanical potentiometer. VW/RW The wiper output is equivalent to the wiper output of a mechanical potentiometer. Hardware Write Protect Input (WP) The WP pin when LOW prevents nonvolatile writes to the Data Registers. Writing to the Wiper Counter Register is not restricted. System/Digital Supply (VCC) VCC is the supply voltage for the system/digital section. VSS is the system ground. PRINCIPLES OF OPERATION The X9421 is a highly integrated microcircuit incorporating a resistor array and associated registers and counter and the serial interface logic providing direct communication between the host and the XDCP potentiometer. Serial Interface The X9421 supports the SPI interface hardware conventions. The device is accessed via the SI input with data clocked in on the rising SCK. CS must be LOW and the HOLD and WP pins must be HIGH during the entire operation. The SO and SI pins can be connected together, since they have three state outputs. This can help to reduce system pin count. Array Description The X9421 is comprised of one resistor array containing 63 discrete resistive segments that are connected in series. The physical ends of each array are equivalent to the fixed terminals of a mechanical potentiometer (VH/RH and VL/RL inputs). |
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