Measuring PSM idle current on the nRF91 DK

RE: Measuring PSM idle current on the nRF91 DK

slomusti — Thu, 05 Mar 2020 16:12:40 GMT

[mention:c8d12f5777084884935d8dc5c6ed1d3b:e9ed411860ed4f2ba0265705b8793d05] I am working on replicating the above example with 1.1.1 modem version and the following build process: https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/build-ncs-application-firmware-images-using-docker

Unfortunately the best value achieved is 508uA, with the following changes:

Disable serial in example
Disable serial in spm
Comment #include uart.h in example due to recent change
Add the following line to top of main: `while(1) k_sleep(1000);`
Disable things that could print at uart

CONFIG_AT_HOST_LIBRARY=n

CONFIG_STDOUT_CONSOLE=n

CONFIG_LOG=n

This results in 510uA power draw.

The interesting results is however that at some point I managed to build a minimal code example with just k_sleep as a secure image and then the power consumption was 4.8uA. Any thoughts?

RE: Measuring PSM idle current on the nRF91 DK

Panda H — Sun, 15 Dec 2019 14:39:16 GMT

Hi, I have two questions regarding to this example:

1. Do you know why it takes around 1 minute to finish sending? When I use the default amount of data (sizeof(ntp_format)), it takes around 12 seconds from sending to go to sleep mode.

2. Have you tested how long it takes to send one Byte and go back to sleep afterwards?

RE: Measuring PSM idle current on the nRF91 DK

phipi — Wed, 06 Nov 2019 15:31:14 GMT

I'm getting stuck at "SPM: prepare to jump to Non-Secure image."

The debugger doesn't seem to be jumping to main.c either. Any thoughts?

RE: Measuring PSM idle current on the nRF91 DK

Otti — Mon, 28 Oct 2019 13:00:53 GMT

What is the type of power supply they use?

RE: Measuring PSM idle current on the nRF91 DK

GJSea — Wed, 25 Sep 2019 05:25:51 GMT

So I ran your unmodified 4721.udp_with_psm.zip example (hence PSM) per your attachment above on a properly configured 0.8.5 DK with the latest modem firmware 1.0.1, Tag 1.0.0, and I'm also getting consistent 37uA current readings. Any idea?

RE: Measuring PSM idle current on the nRF91 DK

rkguy — Mon, 02 Sep 2019 03:28:40 GMT

[mention:c8d12f5777084884935d8dc5c6ed1d3b:e9ed411860ed4f2ba0265705b8793d05] I am having a lot of trouble finding information about why we are using
[embed:dc8ab71f-3b98-42d9-b0f6-e21e02a0f8e2:ab9a8bf2-9f8f-40b9-8394-1b34bedbbd9e:type=text&text=CONFIG_LTE_LEGACY_PCO_MODE%3Dy]
I know that it is coming from [mention:6103a586effd452a902aceafad49d1dd:e9ed411860ed4f2ba0265705b8793d05] but he doesn't say why we use it and the documentation I am finding doesn't seem to shed any light on it either. Is that a requirement to us PSM? I don't think so. Let me know. Thanks

RE: Measuring PSM idle current on the nRF91 DK

Raju Chaluva — Tue, 30 Jul 2019 14:26:25 GMT

What is the maximum peak current nRF9160 draws in initial connection mode or scanning mode?

RE: Measuring PSM idle current on the nRF91 DK

Yusuke — Fri, 19 Jul 2019 01:08:45 GMT

I have trouble in measuring current too.

nRF91 DK: PCA10090 v0.8.5(SB43 cut)
Modem FW: v1.0.0
NCS tag: v1.0.0
power supply: USB
measuring tool: multimeter
I think Nb-IoT is available here.

I downloaded the above Intel hex file and tested it. Besides, I copied the whole project, compile, and tested.
In both case, the current is really high: 34mA

RE: Measuring PSM idle current on the nRF91 DK

Martin Lesund — Fri, 12 Jul 2019 12:20:21 GMT

[mention:568129381d0e4bf697db1e14618ee54f:e9ed411860ed4f2ba0265705b8793d05]
You need to disable serial in the prj.conf for the SPM as well as your application. ~700µA is typical a sign that this peripheral is enabled.

RE: Measuring PSM idle current on the nRF91 DK

Vojislav — Fri, 12 Jul 2019 10:35:33 GMT

I have tried your hex with firmware modem version v1.0.0 and I get around 700uA in sleep with my custom board. When I load your project to segger and compile it, with that hex I get 2.4mA in sleep with the same board. I even set the config CONFIG_SERIAL=n but I get the same result as CONFIG_SERIAL=y. Is there something else I need to configure?

Best regards,
Voja.

RE: Measuring PSM idle current on the nRF91 DK

Eirik Aa — Thu, 27 Jun 2019 12:22:27 GMT

Have you managed to get it running with MCUBoot also?

RE: Measuring PSM idle current on the nRF91 DK

GNotman — Mon, 03 Jun 2019 14:16:00 GMT

[mention:c8d12f5777084884935d8dc5c6ed1d3b:e9ed411860ed4f2ba0265705b8793d05]I believe there is still small issue with the firmware and eDRX. Using the same SIM card with PSM and the above cycle (10m - 1m active), the device did stop the SIM card and the current dropped to ~8uA. However, with the same board and SIM card with an eDRX cycle of ~11m the current was about 30uA higher. Trying other SIM cards showed a range of readings some using ~50uA more than the PSM cycle.

RE: Measuring PSM idle current on the nRF91 DK

Tim! — Wed, 29 May 2019 14:14:57 GMT

Nice guide I tried this and it works perfectly with NB-IoT. I also wanted to try this with LTE-M. I changed CONFIG_LTE_NETWORK_MODE_NBIOT=y to CONFIG_LTE_NETWORK_MODE_LTE_M=y. Now it doesn't seem to enter PSM but when enabling serial communication i can see that i send and receive data. Is there anything else i need to change to get PSM to work on LTE-M?

RE: Measuring PSM idle current on the nRF91 DK

GNotman — Wed, 29 May 2019 11:55:27 GMT

I tested this today with a 0.8.2 DK and got very similar results (8.1uAs @ 3.75V supply).

The only real difference in the process is the SB to cut on the 0.8.2 is SB44.

Just a note, the prj.conf you include above still has CONFIG_SERIAL=y

RE: Measuring PSM idle current on the nRF91 DK

jlienau03 — Tue, 28 May 2019 21:33:30 GMT

Is the SIM card powered off during PSM?