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SmartRF06 Max rated capacitors



Hi Guys,

Bit of a random question. Can someone please check the capacitors and see to what voltage they are rated at?

I had a 'freak accident' at work around 3 weeks ago involving an electric shock. It was hand to hand, holding the ev board in one hand and making contact with a metallic door handle. I still cant fully extend/grip my hands :\

My employer at the time argued that its my usb hub's fault, but scientifically 5V is impossible to shock you. (High skin resistance -> low amps, tested myself again and again, I can't feel 5V via my USB hub/ports or any Ti boards..)

An  electrician came in the next day & commented something along the lines that the lighting switch on the metallic door frame wasn't properly isolated (makes sense). Employer argues that I should have been dead in this case or shown signs of heart fibrillation. (I wasn't there when the light switch was tested/repaired)

The third case I can think of is that there were high voltage caps not fully discharged yet. Which is highly unlikely.

Since I have resigned from there and can't find a BOM specifying the cap voltages, would someone please mind help me solving this mystery and check what they are rated at? :)

Also, sorry if I am tarnishing the Ti forums in this instance. I have full faith in Ti products & that it wasn't the EV board that shocked me. But I really would like some answers for peace of mind.

Thanks guys

  • The SmartRF06 is powered from USB which means that the max voltage on the board is 5 V. This voltage is regulated down to 3.3 V by a regulator placed close to the USB connector meaning that most of the board is 3.3 V. In other words, no caps will be charged to a higher voltage than 3.3 V/ 5 V.

    From your description it sounds like a grounding error (Is the USB hub powered and could it be that this i s faulty?) or poor isolation. Current flow to the closest ground. Where did the current go from your hand that was not holding the door frame?
  • Thanks for your reply

    Yes the USB hub is powered. The flow went from the door (Left Hand) to the dev-board (Right hand).

    I've measured the 5V rail to GND and it's at 5V?
  • * 5V rail to earth is 5.02V. Something like 22mV different between earth and gnd.

    Also, my right has is the one that is damaged.