Kinetis MicrocontrollersのトピックRe: KW41Z setting DC-DC voltage

KW41Z setting DC-DC voltage

mitchenerjosh — Wed, 04 Jul 2018 13:07:15 GMT

I have an application where an ftdi chip for USB is powered by the on board dc to dc converter in the KW41Z (specifically I am using a rigado Bluetooth module). I was able to set the voltage when I am running FreeRTOS using the DCDC.h from the sdk framework, but my current applications cannot use an OS so I need to be able to set up the output of the dc to dc converter using the fsl_dcdc driver.

I am having no luck with this. Does anyone know to use this driver or have any example code that uses it? Is it possible to just write directly to the register?

Any help would be appreciated.

#KW41Z #DCDC #fsl_dcdc #rigado

Re: KW41Z setting DC-DC voltage

chris_brown — Thu, 05 Jul 2018 16:12:21 GMT

Hi mitchenerjosh‌,

I don't have an example of how to use the fsl_dcdc driver off hand, but we do discuss how to adjust the target voltage via direct register writes in this application note:

https://www.nxp.com/docs/en/application-note/AN5025.pdf

Specifically this subject is covered in section 4.2.1 Target Voltage Adjustment.

Please let me know if you have other questions or concerns.

Regards,

Chris

Re: KW41Z setting DC-DC voltage

mitchenerjosh — Mon, 09 Jul 2018 20:45:37 GMT

Thanks,

After following the flowchart I was able to set the voltage.