PSM current problem

RE: PSM current problem

Håkon Alseth — Thu, 10 Nov 2022 13:55:08 GMT

Hi,

Unfortunately, I do not have a detailed overview for telecom providers in your area, but we do have a list for iBasis, and it is able to roam successfully to Orange with PSM (in Paris):

iBasis eSIM International Coverage Update

Kind regards,

Håkon

RE: PSM current problem

con2021 — Thu, 10 Nov 2022 13:00:11 GMT

you are right, but sometimes the people who have tested it are more reliable that the support guys in those companies - from experience

RE: PSM current problem

Håkon Alseth — Thu, 10 Nov 2022 12:25:29 GMT

Hi,

I would recommend that you ask the specific providers about what they support in terms of PSM/eDRX.

Kind regards,

Håkon

RE: PSM current problem

con2021 — Thu, 10 Nov 2022 11:28:15 GMT

great to hear that. I wonder if you still work on this field. I am curious to know if SFR or other French providers support PSM mode, and if they support eDRX/cDRX modes. Can you help me with that?

RE: PSM current problem

Håkon Alseth — Wed, 29 Apr 2020 14:32:28 GMT

Great to hear! I'll look into the extra ~30 uA when UART TX is enabled, but RX is disabled. I do not have a good explanation on that right now.

Kind regards,

Håkon

RE: PSM current problem

Maxvi33 — Wed, 29 Apr 2020 13:21:23 GMT

Eh, i have between 4.8 and 8uA on PSM 😎
I don't think can go lower.

Thank's for your help Hakon

RE: PSM current problem

Håkon Alseth — Wed, 29 Apr 2020 11:20:50 GMT

Hi,

Could you try to disable UART fully? This can be done by following this guide:

https://devzone.nordicsemi.com/f/nordic-q-a/60471/nrf9160-psm-current-consumption-test-problem/245872#245872

Kind regards,

Håkon

RE: PSM current problem

Maxvi33 — Wed, 29 Apr 2020 09:24:00 GMT

Hello,

Oupsy, my current is always 35uA when my modem is OFF...
I have no idea where that come from....

RE: PSM current problem

Håkon Alseth — Tue, 28 Apr 2020 13:55:40 GMT

Hi,

If your SIM card does not support being turned off during PSM, the modem will not turn it off.

Did you get the current consumption lower if you disabled the modem in your application, and went straight to sleep? Just to verify that the 35 uA does indeed come from the SIM?

Kind regards,

Håkon

RE: PSM current problem

Maxvi33 — Mon, 27 Apr 2020 14:08:22 GMT

Thank you.

[quote userid="2115" url="~/f/nordic-q-a/60642/psm-current-problem/246865"]This is good. That example will wakeup and toggle a pin every second, so you'll see a bit of a "dynamic spike" when using a normal multimeter. [/quote]

Exctly what i see!

I was try to increase the interval time (T3412) and take out the sim card during PSM mode but i see 35uA on PSM mode again...

On the hardware file , i c'ant see short SBx to cut alimentation..

RE: PSM current problem

Håkon Alseth — Mon, 27 Apr 2020 13:12:58 GMT

Hi,

[quote user="Maxvi33"]With this sample, i have between 100nA and 10uA, it's difficult to measure with my equipment..[/quote]

This is good. That example will wakeup and toggle a pin every second, so you'll see a bit of a "dynamic spike" when using a normal multimeter.

[quote user="Maxvi33"]How deactivated modem with the prj.conf ? Because maybe it's my function to halt modem is bad...[/quote]

You can deactivate the modem by placing it in flight mode (AT+CFUN=4), or by not initializing it on boot by setting this in your prj.conf:

CONFIG_LTE_AUTO_INIT_AND_CONNECT=n

Kind regards,

Håkon

RE: PSM current problem

Maxvi33 — Mon, 27 Apr 2020 12:26:34 GMT

Thank's for your quick reply !

With this sample, i have between 100nA and 10uA, it's difficult to measure with my equipment..
How deactivated modem with the prj.conf ? Because maybe it's my function to halt modem is bad...

RE: PSM current problem

Håkon Alseth — Mon, 27 Apr 2020 12:10:59 GMT

Hi,

[quote user="Maxvi33"]And i find ~35uA.. Do you have an idea to improve PSM current ? [/quote]

The modem is still enabled, thus the SIM is potentially powered as well.

Could you try to take the sample zephyr/samples/basic/blinky/, and add CONFIG_SERIAL=n, configure the project for board nrf9160_pca10090 (note: no ns prefix when testing this) and see what the current consumption is when testing this ? Remember that you need to power cycle after initial programming.

Kind regards,

Håkon

RE: PSM current problem

Maxvi33 — Mon, 27 Apr 2020 11:45:30 GMT

Hello,

i was try your tips:

int main(void)
{
        
	if (!IS_ENABLED(CONFIG_AT_HOST_LIBRARY)) {
		/* Stop the UART RX for power consumption reasons */
		NRF_UARTE0_NS->TASKS_STOPRX = 1;
	}

	printk("DATA POST test with PSM\n");
	//app_udp_start();
        app_http_start();
	setup_psm();
	timer_init();
        app_socket_start_OFF(); // AT+CFUN=4
	while (1) {
		k_sleep(5000);
		/*if (run_udp == true) {
			printk("Run HTTP POST\n");
			run_udp = false;
			//app_udp_start();
                        app_http_start();
		}*/
	}
	return 1;
}

And i find ~35uA.. Do you have an idea to improve PSM current ?
On the datasheet, i read ~3uA!

Thank's for your help :)

RE: PSM current problem

Håkon Alseth — Fri, 24 Apr 2020 13:35:51 GMT

[quote user="Maxvi33"]Oh thank's[/quote]

You're welcome!

[quote user="Maxvi33"]Maybe it's sim alimentation ? Do you know to cut this?[/quote]

It fits very much into the current consumption you normally see when the SIM is idle and PSM is successfully entered.

If you run your example without starting the modem, and having a main() function that only holds "while (1) k_sleep(some_interval);", it would give you your base-line current. If this is less than 10 uA, then the 35 uA is highly likely from the SIM.

Kind regards,

Håkon

RE: PSM current problem

Maxvi33 — Fri, 24 Apr 2020 13:00:44 GMT

Oh thank's 🙂

Now i have 35 uA !
Maybe it's sim alimentation ? Do you know to cut this?

RE: PSM current problem

Håkon Alseth — Fri, 24 Apr 2020 12:08:19 GMT

Hi,

It looks like you're not disabling the UART RX:

NRF_UARTE0_NS->TASKS_STOPRX = 0;

Try writing '1' to this task.

Kind regards,

Håkon