This post is older than 2 years and might not be relevant anymore
More Info: Consider searching for newer posts

nRF52832 IO problem

Hello!

We have nRF52832 chip on our product and we have some problem with one of its IOs.. We configured P0.16 as RX of UART, And when we run it we see this behavior of this IO:

VCC (yellow) vs P0.16 (green) that configured as UART_RX

Here we see that with rising of VCC (yellow signal) IO (green) rising to almost 1V when it supposed to still at 0V. Important note: we disable and enable VCC fast here so we see that before rising of VCC it don't have 0V. This behaviour is very problematic to our system. Because we have power supply sensitive sensor that connected to this UART. This spike of voltage damage sensor that connected to this IO.

We tried to load to evaluation board same version of SW on nRF52832 and we got next result:

We see that also here we have the problematic spike.

When we erased the evaluation board - we got the same result.

Is this IO known as problematic?

Thank you

Parents Reply
  • If MSP430 has 3.3 volts but the nRF52 does not the MSP430 Tx line powers up the nRF52 and could die. If the MSP430 3.3 volts disappears before the nRF52 3.3 volts the Rx line (from nRF52) powers up the MSP430 and could also die. Likely? Who knows, but series resistors in both lines provide some protection. The other alternative is to throw away the external buck and use the MSP430 3.3 volts for nRF52 as well, if it can handle total load.

Children
Related