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CAT5411WI-25-TE13 Datasheet(PDF) 3 Page - Catalyst Semiconductor |
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CAT5411WI-25-TE13 Datasheet(HTML) 3 Page - Catalyst Semiconductor |
3 / 16 page 3 CAT5411 Document No. 2114, Rev. G DEVICE OPERATION The CAT5411 is two resistor arrays integrated with SPI serial interface logic, four 6-bit wiper control registers and eight 6-bit, non-volatile memory data registers. Each resistor array contains 63 separate resistive elements connected in series. The physical ends of each array are equivalent to the fixed terminals of a mechanical potentiometer (RH and RL). RH and RL are symmetrical and may be interchanged. The tap positions between and at the ends of the series resistors are connected to the output wiper terminals (RW) by a CMOS transistor switch. Only one tap point for each potentiometer is connected to its wiper terminal at a time and is determined by the value of the wiper control register. Data can be read or written to the wiper control registers or the non-volatile memory data registers via the SPI bus. Additional instructions allows data to be transferred between the wiper control registers and each respective potentiometer's non-volatile data registers. Also, the device can be instructed to operate in an "increment/decrement" mode. SERIAL BUS PROTOCOL The CAT5041 supports the SPI bus data transmission protocol. The synchronous Serial Peripheral Interface (SPI) helps the CAT5411 to interface directly with many of today's popular microcontrollers. The CAT5041 contains an 8-bit instruction register .The instruction set and the operation codes are detailed in the instruction set table 3. After the device is selected with CS going low the first byte will be received. The part is accessed via the SI pin, with data being clocked in on the rising edge of SCK. The first byte contains one of the six op-codes that define the operation to be performed. |
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