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X9118 Datasheet(PDF) 3 Page - Intersil Corporation |
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X9118 Datasheet(HTML) 3 Page - Intersil Corporation |
3 / 17 page 3 FN8161.4 December 4, 2009 Pin Configuration X9118 (14 LD TSSOP) TOP VIEW 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 a 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 X9118. DEVICE ADDRESS (A1–A0) 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 X9118. A maximum of 4 XDCP devices may occupy the 2-wire serial bus. 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 or digital 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. These pins are used for Intersil manufacturing and testing purposes. Principles of Operation The X9118 is an integrated microcircuit incorporating a resistor array and its registers and counters and the serial interface logic providing direct communication between the host and the digitally controlled potentiometer. This section provides a detailed description of the following: • Resistor Array Description • Serial Interface Description • Instruction and Register Description Resistor Array Description The X9118 is comprised of a resistor array. The array contains 1023, in effect, discrete resistive segments that are connected in series (see Figure 1). The physical ends of each array are equivalent to the fixed terminals of a mechanical potentiometer (RH and RL inputs). Pin Assignments PIN (TSSOP) SYMBOL FUNCTION 1 V+ Analog Supply Voltage 2 NC No Connect 3 A0 Device Address for 2-wire bus 4 SCL Serial Clock for 2-wire bus 5WP Hardware Write Protect 6 SDA Serial Data Input/Output for 2-wire bus 7VSS System Ground 8 V- Analog Supply Voltage 9 A1 Device Address for 2-wire bus 10 NC No Connect 11 RW Wiper terminal of the Potentiometer 12 RH High terminal of the Potentiometer 13 RL Low terminal of the Potentiometer 14 VCC System Supply Voltage VCC RL VSS 1 2 3 4 5 6 7 8 14 13 12 11 10 9 A0 RW SCL A1 RH NC V+ SDA NC WP V- X9118 |
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