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X9221 데이터시트(PDF) 2 Page - Xicor Inc. |
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X9221 데이터시트(HTML) 2 Page - Xicor Inc. |
2 / 14 page 2 X9221 PIN DESCRIPTIONS Host Interface Pins Serial Clock (SCL) The SCL input is used to clock data into and out of the X9221. 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 X9221 Potentiometer Pins VH (VH0 – VH1), VL (VL0 – VL1) The VH and VL inputs are equivalent to the terminal connections on either end of a mechanical potentiom- eter. VW (VW0 – VW1) 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–VH1, VL0–VL1 Potentiometers (terminal equivalent) VW0–VW1 Potentiometers (wiper equivalent) RES Reserved (Do not connect) 3079 PGM T01 PRINCIPLES OF OPERATION The X9221 is a highly integrated microcircuit incorporat- ing two 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 X9221 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 X9221 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).SDAstatechangesduringSCLHIGH are reserved for indicating start and stop conditions. Start Condition All commands to the X9221 are preceded by the start condition, which is a HIGH to LOW transition of SDA while SCL is HIGH (tHIGH). The X9221 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. 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 RES RES RES A1 A3 SCL RES RES RES DIP/SOIC X9221 3079 ILL F01.1 |
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