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X9268TS24I Datasheet(PDF) 6 Page - Intersil Corporation |
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X9268TS24I Datasheet(HTML) 6 Page - Intersil Corporation |
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6 / 22 page  6 FN8172.4 August 29, 2006 PRINCIPLES OF OPERATION The X9268 is a integrated microcircuit incorporating four resistor arrays and their associated registers and counters and the serial interface logic providing direct communication between the host and the digitally controlled potentiometers. This section provides detail description of the following: – Resistor Array Description – Serial Interface Description – Instruction and Register Description. Array Description The X9268 is comprised of a resistor array (See Figure 1). Each array contains 255 discrete resistive segments that are connected in series. The physical ends of each array are equivalent to the fixed terminals of a mechanical potentiometer (RH and RL inputs). At both ends of each array and between each resistor segment is a CMOS switch connected to the wiper (RW) output. Within each individual array only one switch may be turned on at a time. These switches are controlled by a Wiper Counter Register (WCR). The 8-bits of the WCR (WCR[7:0]) are decoded to select, and enable, one of 256 switches (See Table 1). The WCR may be written directly. These Data Registers can the WCR can be read and written by the host system. Power-up and Down Requirements. At all times, the voltages on the potentiometer pins must be less than V+ and more than V-. During power- up and power-down, VCC, V+, and V- must reach their final values within 1msecs of each other. The VCC ramp rate spec is always in effect. Figure 1. Detailed Potentiometer Block Diagram SERIAL DATA PATH FROM INTERFACE CIRCUITRY REGISTER 0 REGISTER 1 REGISTER 2 REGISTER 3 SERIAL BUS INPUT PARALLEL BUS INPUT COUNTER REGISTER INC/DEC LOGIC UP/DN CLK MODIFIED SCL UP/DN RH RL RW 8 8 C O U N T E R D E C O D E IF WCR = 00[H] THEN RW = RL IF WCR = FF[H] THEN RW = RH WIPER (WCR) One of Two Potentiometers (DR0) (DR1) (DR2) (DR3) X9268 |
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