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Crazy things happen with programmer

be80be

Well-Known Member
TSR 1-2450 crazy thing happened im programing my microcontroller I have 12 volt supply using the tsr 1-2450 to drop voltage to 5 for micro. So i unhook the 12 volt from the mains and hook up laptop to program micro .
Figure this be safe but the micro feeds 5 volt I guess out the sys vdd pin and feed the regulator thru the output and lights up 300 leds
after programming was done. plug the mains back in and it all works like planed for about a hour then the leds stop working there ws2815b leds. so I do some testing and the Di is gettin 4.5 volts but its stuck high so it not sending data.

Next the micro still shows up and programs just GP0 is not good crazy huh.
 
The thing powered my ws28 leds from it I looked and the usb feed the onboard regulator that hooked to it so the usb feed the tsr and on the input I got 12 volts going to leds so I probably need to add a diode to block power out
 
When you work on power rails very good tool is put your scope
on infinite persistence, AC, 100 mV per box, and evaluate PK-PK
noise. Use that as you select bypass cap sizes. Very effective.

Note not all caps, for same capacitance, are equally effective. And
in mixed sig designs always use a bulk cap AND a ceramic cap, say
.1uF, to get good bypassing.

1754088069215.png


OS-CON is polymer tantalum.
 
10x or 1x setting on probe, same for scope setting. Just seems
low..... Scope set to infinite persistence ?
 

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