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X9268US24Z Datasheet(PDF) 5 Page - Intersil Corporation |
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X9268US24Z Datasheet(HTML) 5 Page - Intersil Corporation |
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5 / 22 page  5 FN8172.4 August 29, 2006 PIN DESCRIPTIONS Bus Interface Pins SERIAL DATA INPUT/OUTPUT (SDA) The SDA is a bidirectional serial data input/output pin for a 2-Wire slave device and is used to transfer data into and out of the device. It receives device address, opcode, wiper register address and data sent from an 2-Wire master at the rising edge of the serial clock SCL, and it shifts out data after each falling edge of the serial clock SCL. It is an open drain output and may be wire-ORed with any number of open drain or open collector outputs. An open drain output requires the use of a pull-up resistor. For selecting typical values, refer to the guidelines for calculating typical values on the bus pull-up resistors graph. SERIAL CLOCK (SCL) This input is used by 2-Wire master to supply 2-Wire serial clock to the X9268. DEVICE ADDRESS (A3 - A0) The address inputs are used to set the least significant 3 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 X9268. A maximum of 8 devices may occupy the 2-Wire serial bus. Potentiometer Pins RH, RL The RH and RL pins are equivalent to the terminal connections on a mechanical potentiometer. Since there are 2 potentiometers, there are 2 sets of RH and RL such that RH0 and RL0 are the terminals of POT 0 and so on. RW The wiper pin are equivalent to the wiper terminal of a mechanical potentiometer. Since there are 4 potentiometers, there are 2 sets of RW such that RW0 is the terminal of POT 0 and so on. 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. Analog Supply Voltages (V+ and V -) These supplies are the analog voltage supplies for the potentiometer. The V+ supply is tied to the wiper switches while the V- supply is used to bias the switches and the internal P+ substrate of the integrated circuit. Both of these supplies set the voltage limits of the potentiometer. Other Pins NO CONNECT No connect pins should be left open. This pins are used for Intersil manufacturing and testing purposes. HARDWARE WRITE PROTECT INPUT (WP) The WP pin when LOW prevents nonvolatile writes to the Data Registers. X9268 |
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