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X9241 데이터시트(PDF) 2 Page - Xicor Inc. |
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X9241 데이터시트(HTML) 2 Page - Xicor Inc. |
2 / 16 page 2 X9241 PIN DESCRIPTIONS Host Interface Pins Serial Clock (SCL) The SCL input is used to clock data into and out of the X9241. 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 X9241. Potentiometer Pins VH (VH0 – VH3), VL (VL0 – VL3) The VH and VL inputs are equivalent to the terminal connections on either end of a mechanical potentiom- eter. VW (VW0 – VW3) The wiper outputs are equivalent to the wiper output of a mechanical potentiometer. PIN CONFIGURATION PIN NAMES Symbol Description SCL Serial Clock SDA Serial Data A0–A3 Address VH0–VH3, VL0–VL3 Potentiometers (terminal equivalent) VW0–VW3 Potentiometers (wiper equivalent) 3864 PGM T01 PRINCIPLES OF OPERATION The X9241 is a highly integrated microcircuit incorporat- ing four resistor arrays, their associated registers and counters and the serial interface logic providing direct communication between the host and the E2POT poten- tiometers. Serial Interface The X9241 supports a bidirectional bus oriented proto- col. The protocol defines any device that sends data onto the bus as a transmitter and the receiving device as the receiver. The device controlling the transfer is a master and the device being controlled is the slave. The master will always initiate data transfers and provide the clock for both transmit and receive operations. There- fore, the X9241 will be considered a slave device in all applications. Clock and Data Conventions Data states on the SDA line can change only during SCL LOW periods (tLOW). SDA state changes during SCL HIGH are reserved for indicating start and stop conditions. Start Condition All commands to the X9241 are preceded by the start condition, which is a HIGH to LOW transition of SDA while SCL is HIGH (tHIGH). The X9241 continuously monitors the SDA and SCL lines for the start condition and will not respond to any command until this condition is met. Stop Condition All communications must be terminated by a stop con- dition, which is a LOW to HIGH transition of SDA while SCL is HIGH. 3864 ILL F01A.2 VW0 VL0 VH0 A0 A2 VW1 VL1 VH1 SDA VSS 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC VW3 VL3 VH3 A1 A3 SCL VW2 VL2 VH2 DIP/SOIC/TSSOP X9241 |
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