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X9221AWSZ Datasheet(PDF) 7 Page - Intersil Corporation |
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X9221AWSZ Datasheet(HTML) 7 Page - Intersil Corporation |
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7 / 15 page  SCL from Data Output 1 89 START Acknowledge Master from Transmitter Data Output from Receiver 7 FN8163.2 August 30, 2006 Figure 7. Acknowledge Response from Receiver DETAILED OPERATION Both XDCP potentiometers share the serial interface and share a common architecture. Each potentiometer is comprised of a resistor array, a wiper counter regis- ter and four data registers. A detailed discussion of the register organization and array operation follows. Wiper Counter Register The X9221A contains two wiper counter registers (WCR), one for each XDCP potentiometer. 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 WCR 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 con- tents of its data register zero (R0) upon power-up. The WCR is a volatile register; that is, its contents are lost when the X9221A is powered-down. Although the register is automatically loaded with the value in R0 upon power-up, it should be noted this may be differ- ent from the value present at power-down. Data Registers Each potentiometer has four nonvolatile data regis- ters. 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. It should be noted all operations changing data in one of these 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, these registers can be used as regular memory locations that could possibly store system parameters or user preference data. X9221A |
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