BDM connection problem with mc9s12c32

[sonalchirme]

hi,   

I am also facing same kind of problem with my new multilink universal programmer version C.  All voltages on micro-controller boards are ok. when i am connecting BDM blue light turning on.

After connecting to target orange light also turns on. ( connection happens) But when i am connecting BDM programmer input voltage drops .(i/p voltage= 10 V, after connectingBDM programmer power supply getting into CC mode from CV mode, and power supply voltage drops to 2.5V), by default VCC (5V) also drops.( i think there must be some short circuit happening, but dont know where exactly). I tried all things on my controller board. But facing same thing.     

What can be the problem??? 

Any solution? 

Thanks & regards,

Sonal.

[RadekS · Accepted solution]

Hi Sonal,

Unfortunately it is hard to say what could be reason for that behavior.

I would like to recommend double check connection on both sides of BDM ribbon cable.

Pin1=BKGD, pin2=GND, pin4=RESET, pin6=VCC.

The same has to be checked also on your board schematic/layout. Please be careful with top and bottom connector orientation…

I would like to recommend also try different power supply adapter with higher current capability.

BDM connection to MCU typically means increasing of power supply consumption (in mA range).

Is it possible measure board power supply current with and without BDM connected?

If you use laboratory power supply, are you sure that current limiter do not influence result voltage?

You could try also different AC plugs. I already meet with situation where ground currents between two power sources cause problems during programming…

You could try different PC or BDM Multilink for at least localize source of that issue.

I hope it helps you.

Have a great day,
RadekS

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[sonalchirme]

Hey RadekS,

You rock man...:smileyhappy:

You are great..your suggestion is very accurate........

I solved this problem before your reply....

Input current was problem...

I set it littlebit high and problem got solved...

Thanks you...

[RadekS]

Hi Sonal,

You're welcome.

I am glad that the problem has been resolved.

I wish you good luck in the future development.

Best Regards,
RadekS