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X9271TV14Z-2.7 Datasheet(PDF) 5 Page - Intersil Corporation |
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X9271TV14Z-2.7 Datasheet(HTML) 5 Page - Intersil Corporation |
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5 / 22 page  5 FN8174.3 June 23, 2011 PIN DESCRIPTIONS Bus Interface Pins SERIAL OUTPUT (SO) The Serial Output (SO) is the 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) The Serial Input (SI) is the serial data input pin. All operational codes, byte addresses, and data to be written to the potentiometers and potentiometer registers are input on this pin. Data is latched by the rising edge of the serial clock. SERIAL CLOCK (SCK) The Serial Clock (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 under way, 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 Device Address (A1 - A0) 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 in order to initiate communication with the X9271. CHIP SELECT (CS) When Chip Select (CS) is HIGH, the X9271 is deselected, the SO pin is at high impedance, and (unless an internal write cycle is under way) the device is in 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 (RW) is equivalent to the wiper terminal of a mechanical potentiometer. Supply Pins SYSTEM SUPPLY VOLTAGE (VCC) AND SUPPLY GROUND (VSS) The System Supply Voltage (VCC) pin is the system supply voltage. The Supply Ground (VSS) pin is the system ground. Other Pins HARDWARE WRITE PROTECT INPUT (WP) The Hardware Write Protect Input (WP) pin, when LOW, prevents nonvolatile writes to the data registers. NO CONNECT No Connect pins should be left floating. These pins are used for Intersil manufacturing and testing purposes. X9271 |
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