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I have a PCB that uses the CC2540 BLE chip from TI, using just this board has the current draw hovering around 20 microAmperes,but when plugging in the CC Debugger from TI, this spikes the current draw up by almost 25milliAmperes.
Needed to know if this is an expected behavior or if this is a problem on our end.
For side details, only pins 1,2,3,4 and 7 are interfacing with the board.
pins 8, 9, and 10 have pull ups externally
pin 7 is pulled up externally.
- Connecting a debugger will always impact the current consumption.
- Are you in debug mode when you measure current?
- Why the pull-up on pin 8-10 (I assume these are referring to the debug connector)
- Which software are you running?
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In reply to TER:
Found the issue was with the debugger. Tested with 5 samples.4 manufactured from China and 1 from US. (The conditions of the ones from China are unknown, but have stickers from Digikey)The US manufactured part were also purchased from Digikey and shows no current draw in idleThe ones from China show massive deviations from each other, so I'm guessing there are damages internally, varying currents from 15mA to 90mA
The pull ups are not on the debugger lines but on the PCB linesThe debugger was in initial state, just booted and no mode setCurrent is measured by the power supply and not an IDE/softwareNo software is being run, only a firmware
tl;dr The debugger was most likely damaged.
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