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CC2530 GPIO state issue

Amjad EL HILALI
Intellectual 1915 points

Other Parts Discussed in Thread: CC2530EM, CC2530

Hi ,


I'm using the CC2530EM board, the firmware flashed is unknown but I'm measuring a 0.7V on certain GPIOs, and I would like to understand or guess in which state are this pins? I tried to pull down this GPIOs with a 2.2Mohm resistor but still stay on 0.7V so I guess the output drives and is not a floating state.

The EM goes on a motherboard that we are working on, our firmware set the pins correctly but between the moment of plugging the EM , the CC debugger and flashing the CC2530 , this 0.7V level on this GPIOs drives some of the hardware that we designed  in an unwanted way and curiously goes up to 2V . So understanding this state will help us design correctly our driver and make it immunized properly.

Thanks in advance for your answers.


Amjad

  • 0
    Guru 735695 points

    If you don't know what FW runs on your CC2530em, I suggest you flash some FW to your cc2530 and try again. 

  • 0 in reply to YiKai Chen
    TI__Intellectual 1915 points

    YiKai Chen said:

    If you don't know what FW runs on your CC2530em, I suggest you flash some FW to your cc2530 and try again. 

    Thanks YiKai Chen for your suggestion, but as said before our FW works fine, we only wanted to understand and anticipate certain situations especially between plugging the EM on the board and flashing our code ( we do have many EMs previously flashed by other FWs).

    Thanks TheDarkSide for your Forward, you guessed right, it's about the PA_EN/LNA_EN pins and the MRDY/SRDY on another design. They can be driven automatically from the radio HW...