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X9110TV14IZ-2.7 Datasheet(PDF) 4 Page - Intersil Corporation |
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X9110TV14IZ-2.7 Datasheet(HTML) 4 Page - Intersil Corporation |
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4 / 18 page  4 FN8158.2 October 7, 2005 Potentiometer Pins RH, RL The RH and RL pins are equivalent to the terminal connections on a mechanical potentiometer. RW The wiper pin are equivalent to the wiper terminal of a mechanical potentiometer. 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. ANALOG SUPPLY VOLTAGES (V+ AND V -) These supplies are the analog voltage supplies for the potentiometer. The V+ supply is tied to the wiper switches while the V- supply is used to bias the switches and the internal P+ substrate of the integrated circuit. Both of these supplies set the voltage limits of the potentiometer. Principles Of Operation Device Description SERIAL INTERFACE The X9110 supports the SPI interface hardware conventions. The device is accessed via the SI input with data clocked-in on the rising SCK. CS must be LOW and the HOLD and WP pins must be HIGH during the entire operation. The SO and SI pins can be connected together, since they have three state outputs. This can help to reduce system pin count. ARRAY DESCRIPTION The X9110 is comprised of a resistor array (Figure 1). The array contains the equivalent of 1023 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 the individual array only one switch may be turned on at a time. These switches are controlled by a Wiper Counter Register (WCR). The 10-bits of the WCR (WCR[9:0]) are decoded to select, and enable, one of 1024 switches. WIPER COUNTER REGISTER (WCR) The X9110 contains a Wiper Counter Register (See Table 1) for the XDCP potentiometer. The WCR is equivalent to a serial-in, parallel-out register/counter with its outputs decoded to select one of 1024 switches along its resistor array. The contents of the WCR can be altered in one of three ways: (1) it may be written directly by the host via the write Wiper Counter Register instruction (serial load); (2) it Serial Data Path From Interface Register 0 Serial Bus Input Parallel Bus Input Counter Register RH RL R W 10 10 C O U N T E R D E C O D E If WCR = 000[HEX] then RW = RL If WCR = 3FF[HEX] then RW = RH Wiper (WCR) (DR0) Circuitry Register 1 (DR1) Register 2 (DR2) Register 3 (DR3) FIGURE 1. DETAILED POTENTIOMETER BLOCK DIAGRAM X9110 |
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