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X9241YPI Datasheet(PDF) 8 Page - Xicor Inc. |
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X9241YPI Datasheet(HTML) 8 Page - Xicor Inc. |
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8 / 16 page  8 X9241 Cascade Mode The X9241 provides a mechanism for cascading the arrays. That is, the sixty-three resistor elements of one array may be cascaded (linked) with the resistor ele- ments of an adjacent array. Cascade Control Bits The data byte, for the three-byte commands, contains 6 bits (LSBs) for defining the wiper position plus two high order bits, CM (Cascade Mode) and DW (Disable Wiper). The state of CM enables or disables (normal operation) cascade mode. When the CM bit of the WCR is set to “0” the potentiometer is in the normal operation mode. When the CM bit of the WCR is set to “1” the potentiometer is cascaded with its adjacent higher order potentiometer. For example; if bit 7 of WCR2 is set to “1”, pot 2 will be cascaded to pot 3. The state of DW enables or disables the wiper. When the Figure 9. Cascading Arrays DW bit of the WCR is set to “0” the wiper is enabled; when set to “1” the wiper is disabled. If the wiper is disabled, the wiper terminal will be electrically isolated and float. When operating in cascade mode VH, VL and the wiper terminals of the cascaded arrays must be electrically connected externally. All but one of the wipers must be disabled. The user can alter the wiper position by writing directly to the WCR or indirectly by transferring the contents of the data registers to the WCR or by using the Increment/Decrement command. When using the Increment/Decrement command the wiper position will automatically transition between arrays. The current position of the wiper can be deter- mined by reading the WCR registers; if the DW bit is “0”, the wiper in that array is active. If the current wiper position is to be maintained, a global XFR WCR to Data Register command must be issued before power-down. 3864 ILL F16.1 VH0 VL0 VW0 VL1 VH1 VW1 VL2 VH2 VW2 VL3 VH3 VW3 POT 0 WCR0 POT 1 WCR1 POT 2 WCR2 POT 3 WCR3 EXTERNAL CONNECTION = |
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