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X9259TV24IZ-2.7 Datasheet(PDF) 4 Page - Intersil Corporation |
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X9259TV24IZ-2.7 Datasheet(HTML) 4 Page - Intersil Corporation |
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4 / 21 page  4 FN8169.2 September 16, 2005 Pin Descriptions Bus Interface Pins SERIAL DATA INPUT/OUTPUT (SDA) The SDA is a bidirectional serial data input/output pin for a 2- Wire slave device and is used to transfer data into and out of the device. It receives device address, opcode, wiper register address and data sent from a 2-Wire master at the rising edge of the serial clock SCL, and it shifts out data after each falling edge of the serial clock SCL. 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. SERIAL CLOCK (SCL) This input is used by 2-Wire master to supply 2-Wire serial clock to the X9259. DEVICE ADDRESS (A3 – A0) 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 X9259. A maximum of 16 devices may occupy the 2-Wire serial bus. Device pins A3-A0 must be tie to a logic level which specify the external address of the device, see Figures 3, 4, and 5. Potentiometer Pins RH, RL The RH and RL pins are equivalent to the terminal connections on a mechanical potentiometer. Since there are 4 potentiometers, there are 4 sets of RH and RL such that RH0 and RL0 are the terminals of DCP0 and so on. RW The wiper pin are equivalent to the wiper terminal of a mechanical potentiometer. Since there are 4 potentiometers, there are 4 sets of RW such that RW0 is the terminal of DCP0 and so on. Bias Supply Pins SYSTEM SUPPLY VOLTAGE (VCC) AND SUPPLY GROUND (VSS) The VCC pin is the system supply voltage. The VSS pin is the system ground. Other Pins NO CONNECT No connect pins should be left open. This pins are used for Intersil manufacturing and testing purposes. HARDWARE WRITE PROTECT INPUT (WP) The WP pin when LOW prevents non-volatile writes to the Data Registers. SERIAL DATA PATH FROM INTERFACE CIRCUITRY DR#0 SERIAL BUS INPUT PARALLEL BUS INPUT COUNTER REGISTER INC/DEC LOGIC UP/DN CLK MODIFIED SCK UP/DN 8 8 COUNTER IF WCR = 00[H] then RW is closest to RL IF WCR = FF[H] then RW is closest to RH WIPER (WCR#) #: 0, 1, 2, or 3 One of Four Potentiometers DR#2 DR#1 DR#3 - - - DECODE DCP CORE RW RH RL FIGURE 1. DETAILED POTENTIOMETER BLOCK DIAGRAM X9259 |
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