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X9241AUV Datasheet(PDF) 2 Page - Xicor Inc. |
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X9241AUV Datasheet(HTML) 2 Page - Xicor Inc. |
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2 / 18 page  X9241A Characteristics subject to change without notice. 2 of 18 REV 1.1.13 12/09/02 www.xicor.com PIN DESCRIPTIONS Host Interface Pins Serial Clock (SCL) The SCL input is used to clock data into and out of the X9241A. 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. Address The Address inputs are used to set the least significant 4 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 X9241A. Potentiometer Pins VH/RH(VH0/RH0—VH3/RH3), VL/RL (VL0/RL0—VL3/RL3) The RH and RL inputs are equivalent to the terminal connections on either end of a mechanical potentiometer. VW/RW (VW0/RW0—VW3/RW3) The wiper outputs are equivalent to the wiper output of a mechanical potentiometer. PIN CONFIGURATION PIN NAMES PRINCIPLES OF OPERATION The X9241A is a highly integrated microcircuit incorporating four resistor arrays, their associated registers and counters and the serial interface logic providing direct communication between the host and the XDCP potentiometers. Symbol Description SCL Serial Clock SDA Serial Data A0–A3 Address VH0/RH0–VH3/RH3, VL0/RL0–VL3/RL3 Potentiometer Pins (terminal equivalent) VW0/RW0–VW3/RW3 Potentiometer Pins (wiper equivalent) VW0/RW0 A0 A2 VH1/RH1 SDA VSS 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC A1 A3 SCL DIP/SOIC/TSSOP X9241A VL0/RL0 VH0/RH0 VW1/RW1 VL1/RL1 VW3/RW3 VL3/RL3 VH3/RH3 VW2/RW2 VL2/RL2 VH2/RH2 |
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