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X9438WP24 Datasheet(PDF) 8 Page - Intersil Corporation |
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X9438WP24 Datasheet(HTML) 8 Page - Intersil Corporation |
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8 / 18 page  8 FN8199.0 March 11, 2005 REGISTER OPERATION Both digitally controlled potentiometers share the serial interface and share a common architecture. Each potentiometer is associated with a Wiper Counter Register (WCR), and four Data Registers. Figure 7 illustrates the control, registers, and system features of the device. Figure 7. System Block Diagram Wiper Counter (WCR) and Analog Control Registers (ACR) The X9438 contains two wiper counter registers, one for each XDCP. The wiper counter register is equiva- lent 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 regis- ter 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 instruction (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 register is a volatile register; that is, its contents are lost when the X9438 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. Data Registers (DR) Each potentiometer 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. It should be noted all oper- ations changing data in one of these registers is a non- volatile 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 store sys- tem parameters or user preference data. REGISTER DESCRIPTIONS AND MEMORY MAP Memory Map Wiper Counter Register (WCR) WP0-WP5 identify wiper position. Data Registers (DR, R0 - R3) VOUT (0,1) (DR0-DR3)0,1 Interface and Control Circuitry SCL SDA A0 A1 A2 A3 VH (0,1) VL (0,1) WP VW (0,1) VNI (0,1) + – WCR0,1 VINV (0,1) WCRO WCR1 DR0 DR0 DR1 DR1 DR2 DR2 DR3 DR3 0 0 WP5 WP4 WP3 WP2 WP1 WP0 (volatile) (LSB) Wiper Position or User Data (Nonvolatile) X9438 |
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