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X9271TB-2.7 Datasheet(PDF) 4 Page - Xicor Inc. |
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X9271TB-2.7 Datasheet(HTML) 4 Page - Xicor Inc. |
4 / 23 page X9271 Characteristics subject to change without notice. 4 of 23 REV 1.1.7 2/6/03 www.xicor.com PIN DESCRIPTIONS Bus Interface Pins SERIAL OUTPUT (SO) SO is a 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 pots and pot registers 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 X9271. 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. CMOS level input. DEVICE ADDRESS (A1 - A0) The address inputs are used to set the 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 X9271. CHIP SELECT (CS) When CS is HIGH, the X9271 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 X9271, 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. Potentiometer Pins RH, RL The RH and RL pins are equivalent to the terminal connections on a mechanical potentiometer. RW The wiper pin are equivalent to the wiper terminal of a mechanical potentiometer. Supply Pins SYSTEM SUPPLY VOLTAGE (VCC) AND SUPPLY GROUND (VSS) The VCC pin is the system supply voltage. The VSS pin is the system ground. Other Pins HARDWARE WRITE PROTECT INPUT (WP) The WP pin when LOW prevents nonvolatile writes to the Data Registers. NO CONNECT. No connect pins should be left floating. This pins are used for Xicor manufacturing and testing purposes. |
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