Npm1300 + nrf5340 reset configuration

RE: Npm1300 + nrf5340 reset configuration

frax84 — Tue, 03 Sep 2024 13:09:37 GMT

Hi Parth,

thank you for joining the discussion! Yeah, this could be fine and was the first idea to begin with. The only doubt was if this could give any issue with programming, but after a bit of discussion with Sigurd Hellesvik and reading more stuff this seems to not be an issue.

Thank you everyone 🙂

RE: Npm1300 + nrf5340 reset configuration

frax84 — Tue, 03 Sep 2024 13:08:46 GMT

That's a very crunchy piece of information!

Considering what you said tieing together nPM1300 SHPHLD pin and nrf5340 RESET pin is totally out of discussion. The average LiPo cell (1-cell) is 3.7 to 4.2V. If i operate nrf5340 @1.8V this could be very troubling.

Thank you!

RE: Npm1300 + nrf5340 reset configuration

Sigurd Hellesvik — Tue, 03 Sep 2024 12:59:39 GMT

Even though you do not plan to use the same pin any more, I thought I should say:

We got a possible problem about connecting nRF53 reset pin to SHPHLD.
From Functioning the nRM1300 SHPHLD without a battery , it is stated that "SHPHLD is actually pulled up to the higher of VBAT and VBUS", which means you can get a higher GPIO voltage on the nRF than VDD, which may be unfortunate.

RE: Npm1300 + nrf5340 reset configuration

Parth Parekh — Mon, 02 Sep 2024 10:42:12 GMT

I would suggest that just reset your PMIC as this would turn off all the buck and VDD_supply of your nRF53 so like this it will POR reset your whole system in one button/switch by just cutting of the input supply of your battery.

RE: Npm1300 + nrf5340 reset configuration

frax84 — Fri, 30 Aug 2024 13:47:01 GMT

Nice!
Of course i will test everything i can. There is a lot of room to play with these kits.

Thank you again for the very fruitful discussion!

Frax

RE: Npm1300 + nrf5340 reset configuration

Sigurd Hellesvik — Fri, 30 Aug 2024 13:35:00 GMT

[quote user="frax84"]1) Reset button connected to the SHPHLD pin of nPM1300;[/quote]

Sounds good.

[quote user="frax84"]2a) GPIO (GPIO0..3) pins connected to the RESET pin of the nrf5340 (no pull-up needed). In this case i can HARD RESET the nrf5340 for specific events happening on the nPM1300;[/quote]

Maybe not all, but one of the GPIOs.

[quote user="frax84"]2b) Alternatively, i can connect GPIO0..3 to a GPIO pin of the nrf5340 and manage any event interrupt from nPM1300 in the MCU software (i.e. i can trigger a SOFT RESET for an error event on nPM1300);[/quote]

Yep. 2a and 2b can be done at the same time, cause you can just use GPIO0 for 2a and the rest for 2b.

[quote user="frax84"]1) When i program the nrf5340 using SWD port the programmer will send a SOFT RESET to put the board in a known state and proceed with the programming of the chip;[/quote]

Yep.

[quote user="frax84"]a) (long) push the button (>10s default). In this way the nPM1300 will reset and will cause a power cycle that will pull down VOUT1 (See Fig.49 in the previous post) for tPWRDN (= 100ms) on the nrf5340 that will reset as well;[/quote]

Correct. That is the exact use-case for this feature.

[quote user="frax84"]b) configure the INTENEVENTSSHPHLDSET register of the nPM1300 to trigger a GPIO interrupt on the EVENTSHPHLDBTNPRESS (or RELEASE) event. This interrupt can HARD RESET the nrf5340 in "2a" configuration or SOFT RESET the nrf5340 in "2b" configuration.[/quote]

Sounds good to me, but I must admit I am not 100% sure here (cause it is a tad more complex). I recommend testing it.

[quote user="frax84"]I have been a bit verbose to support the community.[/quote]

We appreciate it!

[quote user="frax84"]I have the nRF5340DK and ordered the nPM1300EK. I'll start experimenting in few days. I'm studying the stuff at the moment [/quote]

Brilliant! I recommend that you test the setup with the DK+EK to be sure that it works. We are all human, so even though we in support here are skilled, we can be wrong sometimes as well. So if you tested it, you will know that it works for sure.

RE: Npm1300 + nrf5340 reset configuration

frax84 — Fri, 30 Aug 2024 09:54:55 GMT

Ok! Things are getting clearer!

Considering all that you said and my constraints i would like to proceed like this:

1) Reset button connected to the SHPHLD pin of nPM1300;

2a) GPIO (GPIO0..3) pins connected to the RESET pin of the nrf5340 (no pull-up needed). In this case i can HARD RESET the nrf5340 for specific events happening on the nPM1300;

2b) Alternatively, i can connect GPIO0..3 to a GPIO pin of the nrf5340 and manage any event interrupt from nPM1300 in the MCU software (i.e. i can trigger a SOFT RESET for an error event on nPM1300);

3) SWD port (SWDIO & SWDCLK) connected to nrf5340 without reset line;

In this way:

1) When i program the nrf5340 using SWD port the programmer will send a SOFT RESET to put the board in a known state and proceed with the programming of the chip;

2) When i want to reset my custom board MCU i can proceed in two ways:

a) (long) push the button (>10s default). In this way the nPM1300 will reset and will cause a power cycle that will pull down VOUT1 (See Fig.49 in the previous post) for tPWRDN (= 100ms) on the nrf5340 that will reset as well;

b) configure the INTENEVENTSSHPHLDSET register of the nPM1300 to trigger a GPIO interrupt on the EVENTSHPHLDBTNPRESS (or RELEASE) event. This interrupt can HARD RESET the nrf5340 in "2a" configuration or SOFT RESET the nrf5340 in "2b" configuration.

This should make it. I have been a bit verbose to support the community.

Please correct me if i wrote some bullshits 😃

[quote userid="106736" url="~/f/nordic-q-a/114296/npm1300-nrf5340-reset-configuration/500521"]Oh, and by the way:
Do you have an nRF5340DK and an nPM1300 EK?[/quote]

I have the nRF5340DK and ordered the nPM1300EK. I'll start experimenting in few days. I'm studying the stuff at the moment 🤓

RE: Npm1300 + nrf5340 reset configuration

Sigurd Hellesvik — Fri, 30 Aug 2024 07:22:30 GMT

Oh, and by the way:
Do you have an nRF5340DK and an nPM1300 EK?

RE: Npm1300 + nrf5340 reset configuration

Sigurd Hellesvik — Fri, 30 Aug 2024 07:13:46 GMT

[quote user="frax84"]When i run the "program!" button the programmer pull down the reset line to be sure that the device is in a known state.[/quote]

If you do not connect the reset line to the programmer (only SWDIO, SWCLK, GND and VDD), the programmer will use Soft Reset instead of pin reset to enter a known state.

[quote user="frax84"]due to the nPM1300 been reset as well. [/quote]

No reset pin to programmer => During programming the nPM1300 reset line is not changing* => nPM1300 will not be reset.

*Unless you press the reset button by mistake during programming ofc.

[quote user="frax84"]

It's probably me overthinking too much, but concurrencies and race conditions make me tripping

Thank you for the patience

[/quote]

It is good that you ask, no worries! Keep the questions coming until you are content with your understanding.

So, I am sure that this won't be an issue with programming. I am still checking to see if it is a problem for anything else.

RE: Npm1300 + nrf5340 reset configuration

frax84 — Thu, 29 Aug 2024 14:27:36 GMT

My doubt for programming is the following: let's assume i connected the button to both nPM1300 and nrf5340 and the reset line is driven by the programming interface. When i run the "program!" button the programmer pull down the reset line to be sure that the device is in a known state. Because of the electrical connections the nrf5340 is reset but also subject to a power-cycle due to the nPM1300 been reset as well. After the reset it could happen that the device is still "off" and the programming fails? Or does it wait for the mcu to boot and everything goes fine?

It's probably me overthinking too much, but concurrencies and race conditions make me tripping 😃

Thank you for the patience

Frax

RE: Npm1300 + nrf5340 reset configuration

Sigurd Hellesvik — Thu, 29 Aug 2024 14:07:53 GMT

Heh, good that you ask.

The configuration you propose is legit when it comes to a programming perspective.
Because you will not trigger the nPM1300 reset during programming if you never connect anything to the reset pin at during programming. Aka it will not matte rif the pins are connected or not.

I cannot see anything that would be bad with connecting these pins right now.
However, I will ask a colleguea to be sure I have not missed anything.

RE: Npm1300 + nrf5340 reset configuration

frax84 — Thu, 29 Aug 2024 14:00:12 GMT

Hi Sigurd,

thank you for the very detailed feedback, but i feel like there are two ways to read your answer:

1) The configuration i propose (1 button for both nPM1300 reset and nrf5340 reset) is legit;

2) The configuration i propose is NOT legit, but not needing the reset on the nrf5340 to program it i can just drop this connection (1 button for the nPM1300 reset and Vdd on the nrf5340 reset) and continue using only one button in total

Which one? :D

Frax

RE: Npm1300 + nrf5340 reset configuration

Sigurd Hellesvik — Thu, 29 Aug 2024 13:36:34 GMT

Hi,

[quote user=""]- npm1300 resets using 1 button connected to the SHPHLD pin or using 2 buttons (one on SHPHLD, the other on GPIO0). In both cases, button(s) needs to be pressed for t>tresetbut. The mode (1 or 2 buttons) needs to be set using proper register configuration.[/quote]

Yes. See LPRESETCONFIG. See default values (0x00) here to see the default mode for this. As I read it, single button long press enabled is the default.

[quote user=""]- nrf5340 resets using 1 button on the RESET pin.[/quote]

Yep. See nRF5340 Pin Reset.

[quote user=""]- the reference design at Fig.49 of npm1300 Product specifications v.1.1 shows a 2 button configuration with 1 button on SHPHLD and the other button connected to both GPIO0 of npm1300 and RESET of nrf5340.[/quote]

That makes sense yes.
I think this has two possible functions:

You can enable two-button reset.

Or you can use the GPIO on the nPM1300 to reset the nRF5340 if if you get nPM1300 errors, for example using PO.RESET, seeOutput under nPM1300 GPIO Pin Configuration.

[quote user=""]Is this a legit configuration considering that i need to program nrf5340 over and over for tests using the SWD port of a Segger J-link?[/quote]

You do not need the RESET pin to program the nRF5340. Ref Programming Custom nRF5340 Board Using nRF5340 Development Kit .

So I do not believe this will become an issue.

Regards,
Sigurd Hellesvik