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AS5050

Datasheet - Ap plicati on Information

8.1.4 SPI Over Long Distances

Over long cable distances you will have coupling capacitance between signals. Therefore consider some aspects.

The circuitry of the connection is shown in Figure 16.

Figure 16. Circuitry of SPI Over Long Distances

One aspect is that between MISO and SCK must be separated with VSS. Additionally filter circuitry, reduces the disturbance to a minimum.

Resistors close to the output pins reduce communication noise and increase EMC.

Required resistors on the output pins are between 100 Ohm and 1000 Ohm. Required capacitance is 100pF.

Place the resistors and capacitors as near as possible to the pins.

For additional information on this issue, please refer to the application note AS5055_SPI_APPNote.

SPI Interface

AS5050

SPI Interface

µC

MOSI

MISO

VSS

SCK

SS/

MOSI

MISO

VSS

SCK

SS/

R

R

R

C

C

C

C

C

C

C

C

R