BLE is getting disconnected when the motor is turned on in NRF52832 circuit.

[Sweety]

Hello, I have designed a custom board with NRF52832 IC which controls vibration motors. And I am turing on vibration motor from n-channel mosfet as shown in the image below.Gate Signal to mosfet is set by NRF52832 IC. I observed when motor is switched on for approaximately one minute, BLE is getting disconnected.

NRF52832 IC is powered from 3.3V And vibration motor is powered from 2S LiIon battery.

What might be the issue? Please help me in this regard.

[Matt]

For the nRF52 DK are you using CR2032 as the power source? Also if you have some spare cycles I suggest you add some simple rtt to your custom board image, just to convince yourself the nRF is not resetting when it's disconnected...

[Sweety]

For nRF52DK, I am using external 3.3V power supply. I am using similar power supply with my custom board. I agree that nRF is resetting, only ble is disconnecting. Can we eradicate that? What do you mean by adding rtt to my custom board image ?

[Matt]

You cannot "agree" that nRF is resetting until you verify it is truly resetting, and one way to "verify" that is to add debug trace into your main() and see if that trace message repeats again and again. You can use the serial debug (debug message pumped out through uart), or use jlink real time trace (RTT) in which the debug message is sent out through the SWD interface. You can still use the RTT with your custom board, you just need to use the nRF52DK as the JLink to connect to your custom board (or just use your stand alone Segger JLink if you already have one). Search in this forum "RTT" and you'll find code examples that you can use in your project.

[Sweety]

I used led Indications for resetting and ble connection. With this, I confirmed that ble is disconnecting.

[AmbystomaLabs]

Ok, so you are back to your EMI/EMC problem. Are you actually going to fix it now?