Interleaved.
On 11/13/2020 1:11 PM, Dave wrote:
Harvey,
? I have a related question here after spending some time researching. I already have a bunch of JST XH connectors and plugs, and pins and the crimper.
Instead of JST, I use 0.1 inch spacing connectors.? The female/female jumpers can be tweaked to remove the individual shrouds, and can be reinserted in strip connectors to make some decent cables.? JST will work fine, but I've found them tricky to use.? I'd just as soon look for premade cables.? Your luck with the crimper (I hope) will be better than mine.
I wanted to design a total SMT pcb and I could solder the power and ground wires to a pad. Then I thought about adding a JST header and use a plug for power and ground.
That works.
Problem is, the JST parts are all through hole. So now for my question ( I may have a clue but will ask anyhow to verify ), what is the best method on the board design to use through hole and SMT at the same time?
I just put them in and let the router do its work.? For your design, you might want to have separate power pins if the supplies are different, say that if you need +5 for the top circuit and +12 for the lower one, have a power connector with separate pins for the two supplies.? That keeps the power supplies from being mixed.
Will I still be able to do my planned 2 different circuits on either side of the board? How should I handle the power header? Use it to supply both sides of the board with one header or use 2 headers for power/GND and separate the copper with islands?
?Given a common ground for both circuits (which works), you're running separate supplies from separate pins, so just one connector and wire it appropriately depending on which circuit you're doing.? You can use unused parts of the other side as jumpers.? If you don't want to do that, you can use 0 ohm resistors (1206 works best just because of the size).? it's easier than running wire jumpers.
So yes, one power/signal connector can do the job if you think that the inputs/outputs don't make for too large a connector
If you have a lot of inputs and outputs, there's two ways to do this:
one is to have a separate power connector (and have separate pins for each supply rather than one "power" pin), and then separate connectors for each circuit.? I'd use different size connectors to avoid misconnections.
two is to have power and signals on one connector (perhaps few pins for signals) not sharing any pins except ground and identical power supply voltages.
Harvey
Thanks,
Dave
