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X9400YV24I Datasheet(PDF) 3 Page - Intersil Corporation |
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X9400YV24I Datasheet(HTML) 3 Page - Intersil Corporation |
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3 / 21 page  3 FN8189.1 March 31, 2005 PIN NAMES DEVICE DESCRIPTION The X9400 is a highly integrated microcircuit incorporating four resistor arrays and their associated registers and counters and the serial interface logic providing direct communication between the host and the XDCP potentiometers. Serial Interface The X9400 supports the SPI interface hardware conventions. 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 X9400 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 X9400 contains four Wiper Counter Registers, one for each XDCP potentiometer. The WCR is equivalent 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 instruction (serial load); it may be written indirectly by transferring 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/decrement instruction. Finally, it is loaded with the contents of its Data Register zero (DR0) upon power-up. The Wiper Counter Register is a volatile register; that is, its contents are lost when the X9400 is powered- down. Although the register is automatically loaded with the value in DR0 upon power-up, this may be different from the value present at power-down. Data Registers Each potentiometer has four 6-bit nonvolatile Data Registers. 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 regular 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 Potentiometer Pins (terminal equivalent) VW0/RW0 - VW1/RW1 Potentiometer Pins (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 X9400 |
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