3.3 Decoupling of the Clients

Another way to mitigate the effect is by decoupling the data and clock lines. This ensures that the host/client communication is not significantly affected by other client devices. The decoupling can be achieved via a resistor on the respective line close to the client device. The resistor is only required if a device actively keeps the line driven. Therefore, not every client device in the application requires this resistor. A minimal solution is to connect only one resistor to the MISO line. However, to maintain balance within the SPI, it is recommended to add a resistor to every SPI line, as illustrated in the following figure.

The resistor value can be calculated based on the following equation.