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X9401 Datasheet(PDF) 5 Page - Intersil Corporation |
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X9401 Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 19 page 5 FN8190.3 October 12, 2006 one of the data registers or directly between the host and the Wiper Counter Register. These instructions are: – Read Wiper Counter Register— read the current wiper position of the selected pot, – Write Wiper Counter Register—change current wiper position of the selected pot, – Read Data Register—read the contents of the selected data register; – Write Data Register—write a new value to the selected data register. – Read Status—This command returns the contents of the WIP bit which indicates if the internal write cycle is in progress. The sequence of these operations is shown in Figure 4 and Figure 5. The final command is Increment/Decrement. It is dif- ferent from the other commands, because it’s length is indeterminate. Once the command is issued, the mas- ter can clock the selected wiper up and/or down in one resistor segment steps; thereby, providing a fine tun- ing capability to the host. For each SCK clock pulse (tHIGH) while SI is HIGH, the selected wiper will move one resistor segment towards the VH/RH terminal. Similarly, for each SCK clock pulse while SI is LOW, the selected wiper will move one resistor segment towards the VL/RL terminal. A detailed illustration of the sequence and timing for this operation are shown in Figure 6 and Figure 7. Detailed Potentiometer Block Diagram Serial Data Path From Interface Circuitry Register 0 Register 1 Register 2 Register 3 Serial Bus Input Parallel Bus Input Wiper Counter Register INC/DEC Logic UP/DN CLK Modified SCL UP/DN VH/RH VL/RL VW/RW If WCR = 00[H] then VW/RW = VL/RL If WCR = 3F[H] then VW/RW = VH/RH 8 6 C o u n t e r D e c o d e (WCR) (One of Four Arrays) X9401 |
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