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X9455WV24-2.7 Datasheet(PDF) 8 Page - Intersil Corporation |
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X9455WV24-2.7 Datasheet(HTML) 8 Page - Intersil Corporation |
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8 / 18 page  8 FN8202.0 November 10, 2004 Principles of Operation The X9455 is an integrated circuit incorporating two resistor arrays with dual wipers on each array, 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 • Up/Down Interface • 2-wire Interface Resistor Array Description The X9455 is comprised of two resistor arrays. 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 (RHi and RLi inputs). (See Figure 1.) Each array has two independent wipers. At both ends of each array and between each resistor segment are two switches, one connected to each of the wiper pins (RWiA and RWiB). Within each individual array only one switch of each wiper may be turned on at a time. These switches are controlled by two Wiper Counter Register (WCR). The 8-bits of the WCR are decoded to select and enable one of 256 switches. Note that each wiper has a dedicated WCR. When all bits of a WCR are zeroes, the switch closest to the corresponding RL pin is selected. When all bits of a WCR are ones, the switch closest to the corresponding RH pin is selected. The WCRs are volatile and may be written directly. There are four non-volatile Data Registers (DR) associated with each WCR. Each DR can be loaded into WCR. All DRs and WCRs can be read or written. Power Up and Down Requirements During power up CS must be high to avoid inadvertant “store” operations. At power up, the contents of Data Registers Level 0 (DR0A0, DR0B0, DR1A0, and DR1B0), are loaded into the corresponding wiper counter register. One of WCRiA[7:0] RHi RWiA RLi = FF hex 255 254 255 256 Decoder Volatile 8-bit Wiper Counter Register WCRiA Four Non-Volatile Data Registers DRiA0, DRiA1, DRiA2, and DRiA3 “i” is either 0 or 1 WCRiB[7:0] = 00 hex 1 0 RWiB 254 0 1 WCRiB[7:0] = FF hex WCRiA[7:0] = 00 hex Volatile 8-bit Wiper Counter Register WCRiB Four Non-Volatile Data Registers DRiB0, DRiB1, DRiB2, and DRiB3 2-wire and Up/Down Interfaces . . . . . . FIGURE 1. DETAILED BLOCK DIAGRAM OF ONE DCP X9455 |
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