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X9252 Datasheet(PDF) 9 Page - Xicor Inc. |
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X9252 Datasheet(HTML) 9 Page - Xicor Inc. |
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9 / 21 page  9 of 21 REV 1.4.1 7/29/03 www.xicor.com X9252 PIN DESCRIPTIONS Bus Interface Pins SERIAL DATA INPUT/OUTPUT (SDA) The SDA is a bidirectional serial data input/output pin for the 2-wire interface. It receives device address, operation code, wiper register address and data from a 2-wire external master device at the rising edge of the serial clock SCL, and it shifts out data after each falling edge of the serial clock SCL. SDA requires an external pull-up resistor, since it’s an open drain output. SERIAL CLOCK (SCL) This input is the serial clock of the 2-wire and Up/Down interface. DEVICE ADDRESS (A2–A0) The Address inputs are used to set the least significant 3 bits of the 8-bit 2-wire interface slave address. A match in the slave address serial data stream must be made with the Address input pins in order to initiate communication with the X9252. A maximum of 8 devices may occupy the 2-wire serial bus. CHIP SELECT (CS) When the CS pin is low, increment or decrement operations are possible using the SCL and U/D pins. The 2-wire interface is disabled at this time. When CS is high, the 2-wire interface is enabled. UP OR DOWN CONTROL (U/D) The U/D input pin is held HIGH during increment oper- ations and held LOW during decrement operations. DCP SELECT (DS1-DS0) The DS1-DS0 select one of the four DCPs for an Up/ Down interface operation. HARDWARE WRITE PROTECT INPUT (WP) When the WP pin is set low, “write” operations to non volatile DCP Data Registers are disabled. This includes both 2-wire interface non-volatile “Write”, and Up/Down interface “Store” operations. DCP Pins RH0, RL0, RH1, RL1, RH2, RL2, RH3, AND RL3 These pins are equivalent to the terminal connections on mechanical potentiometers. Since there are 4 DCPs, there is one set of RH and RL for each DCP. RW0, RW1, RW2, AND RW3 The wiper pins are equivalent to the wiper terminal of mechanical potentiometers. Since there are four DCPs, there are 4 RW pins. |
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