topic Re: [k20]: VLPR Mode with UART ON? in Kinetis Microcontrollers

[k20]: VLPR Mode with UART ON?

huishao2 — Sat, 09 Jan 2016 20:41:47 GMT

Hi-

Is there an application note or example to demonstrate how to make k20d50m go into low power mode like VLPR with UART being active? My board is powered by MQX4.1.

Tanks in advance!

Hui

Re: [k20]: VLPR Mode with UART ON?

mjbcswitzerland — Sun, 10 Jan 2016 14:03:50 GMT

There is a report here:

Using Kinetis Low Power Stop Modes with unrestricted UART operation - a report

Regards

Mark

Re: [k20]: VLPR Mode with UART ON?

huishao2 — Mon, 11 Jan 2016 20:11:39 GMT

Hi Mark

Thanks a lot for your help! Do you know if there is relevant MQX application notes to achieve similar power saving purpose? I can go ask on MQX forum as well.

regards

Hui

Re: [k20]: VLPR Mode with UART ON?

jeremyzhou — Tue, 12 Jan 2016 01:14:54 GMT

Hi Hui Shao,

You can find the power_manager_rtos_demo which include the MQX reside in ~\KSDK_1.3.0\examples\twrk21d50m\demo_apps\power_manager_rtos_demo after you install the KSDK 1.3.

And you can go to download the KSDK through the link as follow.

Software Development Kit for Kinetis MCUs|NXP
Have a great day,
Ping

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Re: [k20]: VLPR Mode with UART ON?

huishao2 — Wed, 13 Jan 2016 18:55:53 GMT

Hi Ping

Thanks for your help!

Here I have some questions regarding the SDK I just downloaded.

1. Does k20D50M support VLPR mode? Where can I find it out?

2. Any design doc that could help me understand the demo "power_manager_rtos_demo"?

I am not using SDK. Our application is built directly on top of MQX4.1. Any other low power demos with UART included?

Regards

Hui

Re: [k20]: VLPR Mode with UART ON?

jeremyzhou — Thu, 14 Jan 2016 06:04:31 GMT

Hi Hui Shao,

Of course, the K20D50M support the VLPR mode and you can find the more detail information in the reference manual.

http://cache.nxp.com/files/32bit/doc/ref_manual/K20P64M50SF0RM.pdf?fpsp=1&WT_TYPE=Reference%20Manuals&WT_VENDOR=FREESCAL…

The Kinetis SDK v1.3 Demo Application User's Guide includes the descriptions of the several demos, please take a moment to review it.

You can also go to download the sample code of the TWR-K20D50M through the link as below and it also contains the low power demo, I think it can be useful.

cache.nxp.com/files/32bit/software/KINETIS_50MHZ_SC.zip?fpsp=1&WT_TYPE=Lab%20and%20Test%20Software&WT_VENDOR=FREESCALE&WT_FILE_FORMAT=zip&WT_ASSET=Downloads&fileExt=.zip

Hope it hleps
Have a great day,
Ping

Re: [k20]: VLPR Mode with UART ON?

huishao2 — Thu, 14 Jan 2016 17:50:49 GMT

Hi Ping

To be more specific, the model is MK20DX128VFM5. Please confirm it supports VLPR mode.

thanks!

Hui

Re: [k20]: VLPR Mode with UART ON?

jeremyzhou — Fri, 15 Jan 2016 05:59:16 GMT

Hi Hui Shao,

The MK20DX128VFM5 also support the VLPR mode, and its reference manual is listed as below.

http://cache.nxp.com/files/32bit/doc/ref_manual/K20P32M50SF0RM.pdf?fpsp=1&WT_TYPE=Reference%20Manuals&WT_VENDOR=FREESCAL…
Have a great day,
Ping