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X9251US24I-2.7 Datasheet(PDF) 6 Page - Xicor Inc. |
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X9251US24I-2.7 Datasheet(HTML) 6 Page - Xicor Inc. |
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6 / 25 page  X9251 Characteristics subject to change without notice. 6 of 25 REV 1.3.3 2/10/04 www.xicor.com PRINCIPLES OF OPERATION The X9251 is an integrated circuit incorporating four DCPs and their associated registers and counters, and a serial interface providing direct communication between a host and the potentiometers. DCP Description Each DCP is implemented with a combination of resistor elements and CMOS switches. The physical ends of each DCP are equivalent to the fixed terminals of a mechanical potentiometer (RH and RL pins). The RW pin is an intermediate node, equivalent to the wiper terminal of a mechanical potentiometer. The position of the wiper terminal within the DCP is controlled by an 8-bit volatile Wiper Counter Register (WCR). Power Up and Down Recommendations. There are no restrictions on the power-up or power- down conditions of VCC and the voltages applied to the potentiometer pins provided that VCC is always more positive than or equal to VH, VL, and VW, i.e., VCC ≥ VH, VL, VW. The VCC ramp rate specification is always in effect. Figure 1. Detailed Potentiometer Block Diagram 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 closet to RL IF WCR = FF[H] then RW is closet 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 |
Similar Part No. - X9251US24I-2.7 |
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Similar Description - X9251US24I-2.7 |
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