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Adding an external power switch control to the CC2540 Keyfob

Mark Hinds
Prodigy 90 points
Other Parts Discussed in Thread: CC2540, CC2541

On the TI CC2540 Keyfob from the BLE MDK there exists the option of powering it from the Debugger (instead of from a battery). This option is enabled by shorting together the 2 pads of R1 on the Keyfob PC board.  However, once ths is done, it would be messy to reverse. 

So, does anyone know if one could solder a switch across these contacts, in order to allow switching back and forth between the 2 board power options? In particular, what sort of impedance is allowed in the short-circuit? TI could probably best answer this question, but any informed opinion is welcome.

Thanks in advance,

Mark Hinds

  • 0
    TI__Genius 12545 points

    Mark,

    We did improve this on the CC2541 Key Fob, where we added a 2 point jumper, which can be shorted when supplying the board from the CC Debugger. The Jumper is also handy during current measurements where the current meter can be connected across the two jumpers (again the board is supplied by the CC Debugger in this case)

    You are almost better off try to solder on a  surface mount jumper and shorting them if and when you supply the board using the CC Debugger.