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X9421YVI-2.7 Datasheet(PDF) 5 Page - Xicor Inc. |
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X9421YVI-2.7 Datasheet(HTML) 5 Page - Xicor Inc. |
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5 / 21 page  X9421 REV 1.1.6 8/1/02 Characteristics subject to change without notice. 5 of 21 www.xicor.com At both ends of the array and between each resistor segment is a CMOS switch connected to the wiper (VW/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 six bits of the WCR are decoded to select, and enable, one of sixty-four switches. The block diagram of the potentiometer is shown in Figure 1. Wiper Counter Register (WCR) The X9421 contains a Wiper Counter Register. The WCR can be envisioned as a 6-bit parallel and serial load counter with its outputs decoded to select one of sixty-four switches along its resistor array. The contents of the WCR can be altered in four ways: it may be written directly by the host via the Write Wiper Counter Register instruction (serial load); it may be written indirectly by transferring the contents of one of four associated Data Registers via the XFR Data Register instruction (parallel load); it can be modified one step at a time by the Increment/ Decrement instruction. Finally, it is loaded with the contents of its data register zero (DR0) upon power-up. The Wiper Counter Register is a volatile register; that is, its contents are lost when the X9421 is powered- down. Although the register is automatically loaded with the value in DR0 upon power-up, this may be different from the value present at power-down. Data Registers The potentiometer has four 6-bit nonvolatile Data Registers. These can be read or written directly by the host. Data can also be transferred between any of the four Data Registers and the WCR. It should be noted all operations changing data in one of the Data Registers is a nonvolatile operation and will take a maximum of 10ms. If the application does not require storage of multiple settings for the potentiometer, the Data Registers can be used as regular memory locations for system parameters or user preference data. Register Descriptions Table 1. Data Registers, (6-bit), Nonvolatile There are four 6-bit Data Registers associated with the potentiometer. – {D5~D0}: These bits are for general purpose Nonvol- atile data storage or for storage of up to four different wiper values. Table 2. Wiper Counter Register, (6-bit), Volatile – {WP5~WP0}: These bits specify the wiper position of the potentiometer. 0 0 D5 D4 D3 D2 D1 D0 (MSB) (LSB) 0 0 WP5 WP4 WP3 WP2 WP1 WP0 (MSB) (LSB) |
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