Working with Multiple SPI ICs on a Single Bus
When dealing with multiple SPI ICs on a single bus, careful routing is crucial. In this scenario, the bus spans 310 mm, with signals inserted in the middle and a maximum SPI clock speed of <10MHz. The board is two-sided with a ground flood fill in between.
Two main concerns arise:
- Routing the clock line over other lines may cause signal integrity issues. It’s essential to assess the impact of this configuration.
- Considering the bus length of 310mm, ensuring signal integrity over such a distance is vital. Divide the length by 2 (155mm on each side) to manage signal propagation effectively.
While a full layout cannot be shared due to project constraints, addressing these concerns will help optimize the performance of your SPI ICs on the bus.
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