Hello. I'm designing a rigid flex cable and the ground plane hatch spacing seems to be dependent on the min rise/fall time of the signals. Does anyone know what that might be on a 5MHz VOXL2 SPI bus?

This was very helpful, thank you!

I'm trying to connect the VOXL2 to a USB using a TTL to USB serial converter like this:
https://ftdichip.com/products/ttl-232rg-vreg1v8-we/
I was planning on using J3 pins 27 & 29 as RX & TX. Do you know what pins would work for the "Clear to send control input/ handshake signal" and the "Request to send control output/ handshake signal"? Would any GPIO pin be acceptable?