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X9429WS16IZ-2.7 Datasheet(PDF) 4 Page - Intersil Corporation |
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X9429WS16IZ-2.7 Datasheet(HTML) 4 Page - Intersil Corporation |
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4 / 20 page  4 FN8248.3 October 13, 2008 Pinouts X9429 (14 LD TSSOP) TOP VIEW X9429 (16 LD SOIC) TOP VIEW Pin Assignments Pin Descriptions Host Interface Pins SERIAL CLOCK (SCL) The SCL input is used to clock data into and out of the X9429. SERIAL DATA (SDA) SDA is a bidirectional pin used to transfer data into and out of the device. 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. DEVICE ADDRESS (A0, A2, A3) 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 X9429. A maximum of 8 devices may occupy the 2-wire serial bus. Potentiometer Pins RH/VH, RL/VL The RH/VH and RL/VL inputs are equivalent to the terminal connections on either end of a mechanical potentiometer. RW/VW The wiper outputs are equivalent to the wiper output of a mechanical potentiometer. HARDWARE WRITE PROTECT INPUT WP The WP pin when low prevents nonvolatile writes to the Data Registers. Principals of Operation The X9429 is a highly integrated microcircuit incorporating a resistor array and its associated registers and counters and the serial interface logic providing direct communication between the host and the XDCP potentiometers. Serial Interface The X9429 supports a bidirectional bus oriented protocol. The protocol defines any device that sends data onto the VCC RL/VL VSS 1 2 3 4 5 6 7 8 14 13 12 11 10 9 NC RW/VW SCL A2 RH/VH X9429 NC NC SDA A3 WP A0 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 X9429 VCC RL/VL RW/VW RH/VH A3 WP A0 NC VSS SCL A2 NC SDA NC NC NC TSSOP PIN SOIC PIN SYMBOL BRIEF DESCRIPTION 1, 2, 3 12, 3, 7, 15 NC No Connect 4 4 A2 Device Address for 2-wire bus. 5 5 SCL Serial Clock for 2-wire bus. 6 6 SDA Serial Data Input/Output for 2-wire bus. 78 VSS System Ground 89 WP Hardware Write Protect 9 10 A0 Device Address for 2-wire bus. 10 11 A3 Device Address for 2-wire bus. 11 12 RW/VW Wiper Terminal of the Potentiometer. 12 13 RH/VH High Terminal of the Potentiometer. 13 14 RL/VL Low Terminal of the Potentiometer. 14 16 VCC System Supply Voltage X9429 |
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