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X9440YV24 Datasheet(PDF) 4 Page - Intersil Corporation |
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X9440YV24 Datasheet(HTML) 4 Page - Intersil Corporation |
4 / 21 page 4 FN8200.0 March 28, 2005 REGISTERS Both digitally-controlled potentiometers and voltage com- parators share the serial interface and share a common architecture. Each potentiometer and voltage comparator is associated with wiper counter and analog control reg- isters and eight data registers. A detailed discussion of the register organization and array operation follows. Wiper Counter (WCR) and Analog Control Registers (ACR) The X9440 contains two wiper counter registers: one for each XDCP potentiometer and two Analog Control Registers, and one for each of the two voltage com- parators. The wiper counter register is equivalent to a serial-in, parallel-out counter with its outputs decoded to select one of sixty-four switches along its resistor array. The contents of the wiper counter register and analog control register can be altered in four ways: it may be written directly by the host via the Write WCR instruction (serial load); it may be written indirectly by transferring the contents of one of four associated data registers (DR) via the XFR data register instruc- tion (parallel load); it can be modified one step at a time by the increment/ decrement instruction (WCR only). Finally, it is loaded with the contents of its data register zero (R0) upon power-up. The wiper counter and analog control register are vol- atile registers; that is, their contents are lost when the X9440 is powered-down. Although the registers are automatically loaded with the value in R0 upon power- up, it should be noted this may be different from the value present at power-down. Programming the ACR is similar to the WCR. How- ever, the 6 bits in the WCR positions the wiper in the resistor array while 3 bits in the ACR control the com- parator and its output. Data Registers (DR) Each potentiometer and each voltage comparator has four non volatile data registers (DR). These can be read or written directly by the host and data can be transferred between any of the four data registers and the WCR or ACR. It should be noted all operations changing data in one of these registers is a non vola- tile operation and will take a maximum of 10ms. If the application does not require storage of multiple settings for the potentiometer or comparator, these reg- isters can be used as regular memory locations that could store system parameters or user preference data. Figure 1. Detailed Potentiometer Block Diagram Serial Data Path From Interface Circuitry Register 0 Register 1 Register 2 Register 3 Serial Bus Input Parallel Bus Input Counter Register Inc/Dec Logic UP/DN CLK Modified SCK UP/DN VH VL VW 8 6 C o u n t e r D e c o d e If WC = 00[H] VW = VL If WC = 3F[H] VW = VH Wiper (One of Two Arrays) (WCR) X9440 |
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