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X9420WSM Datasheet(PDF) 2 Page - Xicor Inc. |
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X9420WSM Datasheet(HTML) 2 Page - Xicor Inc. |
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2 / 20 page  X9420 Characteristics subject to change without notice. 2 of 20 REV 1.1.6 7/30/02 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 X9420. Chip Select (CS) When CS is HIGH, the X9420 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 X9420, 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 inputs 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 X9420. A maximum of 2 devices may occupy the SPI serial bus. Potentiometer Pins VH/RH, VL/RL The VH/RH and VL/RL input 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. Analog Supplies (V+, V-) The analog supplies V+, V- are the supply voltages for the XDCP analog section. System/Digital Supply (VCC) VCC is the supply voltage for the system/digital section. VSS is the system ground. PIN CONFIGURATION VCC CS RL/VL SI WP VSS 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 V+ NC A0 SO HOLD SCK NC V- DIP/SOIC X9420 RH/VH RW/VW TSSOP VCC CS RL/VL SI WP VSS 1 2 3 4 5 6 7 14 13 12 11 10 9 8 V+ A0 SO HOLD SCK V- X9420 RH/VH RW/VW |
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