nRF52832 UART pin state in RESET

RE: nRF52832 UART pin state in RESET

Nguyen Hoan Hoang — Wed, 12 Jun 2019 20:03:21 GMT

You can still live the nRF powered and running no problem as long as you don't transmit. It will be just like hooking up a logic analyser on the line

RE: nRF52832 UART pin state in RESET

awneil — Wed, 12 Jun 2019 17:58:03 GMT

No - the default is hardware defined.

RE: nRF52832 UART pin state in RESET

Anne van Rossum — Wed, 12 Jun 2019 16:41:37 GMT

Can the default behavior be configured to be different than the above?

RE: nRF52832 UART pin state in RESET

Sigurd — Wed, 21 Dec 2016 08:51:18 GMT

All pins will be configured as above, independent of any function/configuration the pin had before the reset.

RE: nRF52832 UART pin state in RESET

Robert — Wed, 21 Dec 2016 08:45:54 GMT

Just to make this clear, you say that the GPIO pins will be configured as above, is there any difference if a pin is set to any other function, e.g. UART, or do they behave in the same way?

RE: nRF52832 UART pin state in RESET

Sigurd — Fri, 16 Dec 2016 14:27:17 GMT

Hi,

When you hold the chip in reset mode the GPIO pins will be configured as PIN_CNF[pin number] = 0x02, which means:

Input pin
Disconnected input buffer
No Pull
S0S1 drive
Sense Disabled

For debugging purposes, you only need to connect the debug-device on the host TX line/nRF RX line, which you can safely do when the nRF is in RESET mode(as long as you don't exceed the Abs.Max rating values VDD+0.3V). You should not apply any voltage on the pins when the nRF is unpowered, as this will exceed the Abs.Max rating values since VDD is 0.

RE: nRF52832 UART pin state in RESET

Robert — Thu, 15 Dec 2016 15:21:07 GMT

It's for debugging the host mostly, but I'm not fully informed on the use case for this. It would be a great benefit it we didn't need to have 0R series resistors that needed to be removed, as space is very limited on the board.

RE: nRF52832 UART pin state in RESET

Sigurd — Thu, 15 Dec 2016 14:14:30 GMT

So if I understand you correctly; you want use one UART peripheral on the host microcontroller to communicate with 2 different devices, and one of these two devices is the nRF52832?