CAT5401WI-00 datasheet(3/15 Pages) CATALYST

Part #	CAT5401WI-00

Description	Quad Digitally Programmable Potentiometers (DPP?? with 64 Taps and SPI Interface

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Manufacturer	CATALYST [Catalyst Semiconductor]

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CAT5401

3

Doc. No. MD-2012 Rev. G

Characteristics subject to change without notice

SERIAL BUS PROTOCOL

The CAT5041 supports the SPI bus data transmission

protocol. The synchronous Serial Peripheral Interface

(SPI) helps the CAT5401 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.

DEVICE OPERATION

The CAT5401 is four resistor arrays integrated with

SPI serial interface logic, four 6-bit wiper control

registers and sixteen 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.

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CAT5401WI-00 Datasheet(PDF) 3 Page - Catalyst Semiconductor

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