P
Peter S. May
- Jan 1, 1970
- 0
I'm working on a microcontrolled LED lighting setup in which breakout
boards with eight outputs each would be connected to the microcontroller
board by cables (CAT-5 is what's on hand) at a length of somewhere
between 1m and 3m. The breakout boards would contain some sort of
D-type flip-flop or latched parallel-out shift register with outputs
connected to transistors that then drive the LEDs. Using a shift
register would have three signal lines (signal, shift clock, latch
clock) and two supply lines.
I need sort of a run-down of the design considerations I need to account
for, and I'm not sure where to look. Are decoupling capacitors (say,
..1uF) going to be enough to keep the ground stable? Will putting
Schmitt triggers on all the input signal lines of the breakout boards
help? Without resorting to differential signaling, what limits will I
run into for the data rate? Will a long cable make a significant
addition to propagation delay?
Thanks in advance for any insight...
PSM
boards with eight outputs each would be connected to the microcontroller
board by cables (CAT-5 is what's on hand) at a length of somewhere
between 1m and 3m. The breakout boards would contain some sort of
D-type flip-flop or latched parallel-out shift register with outputs
connected to transistors that then drive the LEDs. Using a shift
register would have three signal lines (signal, shift clock, latch
clock) and two supply lines.
I need sort of a run-down of the design considerations I need to account
for, and I'm not sure where to look. Are decoupling capacitors (say,
..1uF) going to be enough to keep the ground stable? Will putting
Schmitt triggers on all the input signal lines of the breakout boards
help? Without resorting to differential signaling, what limits will I
run into for the data rate? Will a long cable make a significant
addition to propagation delay?
Thanks in advance for any insight...
PSM