Keith- A ground plane is essential
- Flood-filled copper pours do not count as a ground plane
- STEbus boards are allowed up to 4 amps at 5V
- STEbus backplanes carry up to 20A (5 slot), 40A (10 slot) or 84A (21 slot)
- This requires many threaded terminals, 2 per slot.
M4 x 15 mm used on backplanes shown. - This requires adequately thick power cabling
- Short backplanes (e.g. 5 slot) can get away with terminations at just one end
These are 270R pulled to 2.8 volts. - Larger backplanes (e.g. 10 slot) should be terminated at both ends.
Both ends are 270R, giving a DC pull-up of 135R - On double-height Eurocards, the STEbus connector must be the bottom connector.
This allows it to co-exist with double-height VME boards, which use the top connector:![]()
Key points of backplane design
A project log for STEbus
CPU-neutral, professionally designed, industrial strength. Design slave boards that work with any processor.
Discussions
Become a Hackaday.io Member
Create an account to leave a comment. Already have an account? Log In.