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X9430WV24 Datasheet(PDF) 2 Page - Xicor Inc. |
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X9430WV24 Datasheet(HTML) 2 Page - Xicor Inc. |
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2 / 21 page  X9430 – Preliminary Information Characteristics subject to change without notice. 2 of 21 REV 1.0 6/20/00 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) SI is the serial data input pin. All opcodes, byte addresses and data to be written to the device 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 X9430. Chip Select (CS) When CS is HIGH, the X9430 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 X9430, 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. Hardware Write Protect Input WP The WP pin when low prevents nonvolatile writes to the wiper counter register. 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 com- munication, 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–A1) The address inputs are used to set the least significant 2 bits 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 X9430. A maximum of 4 devices may occupy the SPI serial bus. Potentiometer Pins1 RH (RH0–RH1), RL (RL0–RL1) The RH and RL inputs are equivalent to the terminal connections on either end of a mechanical potentiom- eter. RW (RW0–RW1) The wiper output is equivalent to the wiper output of a mechanical potentiometer. Amplifier and Device Pins Amplifier Input Voltage VNI(0,1) and VINV(0,1) VNI and VINV are inputs to the noninverting (+) and inverting (-) inputs of the operational amplifiers. Amplifier Output Voltage VOUT(0,1) VOUT is the voltage output pin of the operational ampli- fier. Analog Supplies V+, V- The Analog Supplies V+, V- are the supply voltages for the XDCP analog section and the operational amplifi- ers. System Supply VCC and Ground VSS The system supply VCC and its reference VSS is used to bias the interface and control circuits. 1. Alternate designations for RH, RL, RW are VH, VL, VW |
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