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X9241AWPZ Datasheet(PDF) 9 Page - Intersil Corporation |
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X9241AWPZ Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 16 page 9 FN8164.1 September 15, 2005 Cascade Mode The X9241A provides a mechanism for cascading the arrays. That is, the sixty-three resistor elements of one array may be cascaded (linked) with the resistor elements of an adjacent array. The VL/RL of the higher order array must be connected to the VH/RH of the lower order array (See Figure 9). 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, normal operation). The state of the CM bit (bit 7 of WCR) enables or disables 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 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/RH, VL/RL 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 determined 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 on power-down a global XFR WCR to Data Register command must be issued to store the position in NV memory before power-down. It is possible to connect three or all four potentiometers in cascade mode. It is also possible to connect POT 3 to POT 0 as a cascade. The requirements for external connections of VL/RL, VH/RH and the wipers are the same in these cases. VH0/RH0 VL0/RL0 VW0/RW0 VL1/RL1 VH1/RH1 VW1/RW1 VL2/RL2 VH2/RH2 VW2/RW2 VL3/RL3 VH3/RH3 VW3/RW3 Pot 0 WCR0 Pot 1 WCR1 Pot 2 WCR2 Pot 3 WCR3 External Connection = FIGURE 9. CASCADING ARRAYS X9241A |
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