ezLINX™

Hardware User

Guide

i

Coupler® Isolated Interface Development

Environment

Rev. PrA | Page 7 of 15

ISOLATED SPI

Two Isolated SPI ports are implemented using the ADuM3401,

ADuM3402 iCoupler signal isolators and the ADuM5000

iso

Power Isolated DC to DC converter. The ADuM3401 of the

isolate d SPI1 is connected to SPI0 of the ADSP-BF548. The

ADuM3402 is used for isolating the SPI slave select lines. Figure

8 shows a circuit diagram of the implementation of Isolated

SPI1 using the ADuM3401, ADuM3402 and ADuM5000 on the

ez

LINX hardware.

The ADuM3401 of the isolate d SPI2 is connected to SPI2 of the

ADSP-BF548. The ADuM3402 is used for isolating the SPI slave

select lines. Figure 9 shows a circuit diagram of the

implementation of Isolated SPI2 using the ADuM3401,

ADuM3402 and ADuM5000 on the ezLINX hardware.

ADuM5000 are powered by 3.3V. The ADuM5000 will generate

ADuM3401 and ADuM3402.

Two seven pin screw terminal connectors, J10 and J25 are used

for easy access to the SPISCK(Pin 1), SPIMOSI(Pin 2),

SPISEL1/SPISS(Pin 3), SPIMISO(Pin 4). SPISEL2(Pin 5),

SPISEL3(Pin 6) and SPI_ISO_GND(Pin 7).

To connect Isolated SPI1 as a master, connect jumpers JP5, JP7,

JP9, JP11, JP13 and JP15 while leaving jumpers JP6, JP8, JP10,

JP12, JP14 and JP16 open. To connect Isolated SPI1 as a slave,

connect jumpers JP6, JP8, JP10, JP12, JP14 and JP16 while

leaving jumpers JP5, JP11, JP13 and JP15 open.

To connect Isolated SPI2 as a master, connect jumpers JP22,

JP24, JP26, JP28, JP30 and JP32 while leaving jumpers JP23,

JP25, JP27, JP29, JP31 and JP33 open. To connect Isolated SPI1

as a slave, connect jumpers JP23, JP25, JP27, JP29, JP31 and

JP33 while leaving jumpers JP22, JP24, JP26, JP28, JP30 and

JP32 open.