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X9401 Datasheet(PDF) 4 Page - Intersil Corporation |
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X9401 Datasheet(HTML) 4 Page - Intersil Corporation |
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4 / 20 page  4 FN8190.2 September 23, 2005 PIN NAMES DEVICE DESCRIPTION The X9401 is a highly integrated microcircuit incorpo- rating four resistor arrays and their associated regis- ters and counters and the serial interface logic providing direct communication between the host and the XDCP potentiometers. Serial Interface The X9401 supports the SPI interface hardware con- ventions. The device is accessed via the SI input with data clocked in on the rising SCK. CS must be LOW and the HOLD and WP pins must be HIGH during the entire operation. The SO and SI pins can be connected together, since they have three state outputs. This can help to reduce system pin count. Array Description The X9401 is comprised of four resistor arrays. Each array contains 63 discrete resistive segments that are connected in series. The physical ends of each array are equivalent to the fixed terminals of a mechanical potentiometer (VH/RH and VL/RL inputs). At both ends of each array and between each resistor segment is a CMOS switch connected to the wiper (VW/RW) output. Within each individual array only one switch may be turned on at a time. These switches are controlled by a Wiper Counter Register (WCR). The six bits of the WCR are decoded to select, and enable, one of sixty-four switches. Wiper Counter Register (WCR) The X9401 contains four Wiper Counter Registers, one for each XDCP potentiometer. The WCR is equiv- alent to a serial-in, parallel-out register/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 Wiper Counter Register instruc- tion (serial load); it may be written indirectly by trans- ferring the contents of one of four associated data registers via the XFR Data Register or Global XFR Data Register instructions (parallel load); it can be modified one step at a time by the Increment/Decre- ment instruction. 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 X9401 is powered- down. Although the register is automatically loaded with the value in R0 upon power-up, this may be differ- ent from the value present at power-down. The wiper position must be stored in R0 to insure restoring the wiper position after power-up. Data Registers Each potentiometer has four 6-bit nonvolatile data reg- isters. These can be read or written directly by the host. Data can also be transferred between any of the four data registers and the associated Wiper Counter Register. All operations changing data in one of the data 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, the data registers can be used as memory locations for system parameters or user preference data. Data Register Detail Symbol Description SCK Serial Clock SI, SO Serial Data A0 - A1 Device Address VH0/RH0 - VH3/RH3, VL0/RL0 - VL3/RL3 Potentiometers (terminal equivalent) VW0/RW0 - VW1/RW1 Potentiometers (wiper equivalent) WP Hardware Write Protection VCC System Supply Voltage VSS System Ground NC No Connection (MSB) (LSB) D5 D4 D3 D2 D1 D0 NV NV NV NV NV NV X9401 |
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