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X9111TV14-2.7 Datasheet(PDF) 4 Page - Xicor Inc. |
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X9111TV14-2.7 Datasheet(HTML) 4 Page - Xicor Inc. |
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4 / 21 page  X9111 – Preliminary Information Characteristics subject to change without notice. 4 of 21 REV 1.1.15 5/9/03 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) 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 X9111. 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, A1) The address inputs are used to set the 8-bit slave address. A match in the slave address serial data stream must be made with the address input (A1–A0) in order to initiate communication with the X9111. CHIP SELECT (CS) When CS is HIGH, the X9111 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 X9111, 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 Data Registers. Potentiometer Pins RH, RL The RH and RL pins are equivalent to the terminal connections on a mechanical potentiometer. RW The wiper pin is equivalent to the wiper terminal of a mechanical potentiometer. Bias 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 NO CONNECT (NC) Pin should be left open. This pin is used for Xicor manufacturing and test purposes. PRINCIPLES OF OPERATION DEVICE DESCRIPTION Serial Interface The X9111 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 X9111 is comprised of a resistor array (see Figure 1). The array contains the equivalent of 1023 discrete resistive segments that are connected in series. The physical ends of each array are equivalent to the fixed terminals of a mechanical potentiometer (RH and RL inputs). At both ends of each array and between each resistor segment is a CMOS switch connected to the wiper (RW) output. Within the individual array only one switch may be turned on at a time. |
Similar Part No. - X9111TV14-2.7 |
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Similar Description - X9111TV14-2.7 |
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