topic Re: freedom board as programmer in Kinetis Microcontrollers

freedom board as programmer

andyvoss — Fri, 22 Jul 2016 11:43:03 GMT

I have a Freedom KE02 board I am using as a programmer for a stand-alone KE02 system. I am using J7 as the programming interface, after disconnecting the dataline from the on-board KE02.

I have to use the stand-alone system at 5V. In order to keep using the Freedom board while powered up at 5V, I will disconnect V3.3 from J7. Should I put a 1KOhm resistor in line with the SWD_DIO or CLK lines? I am using TXD and RXD with 1KOhm resistors in line with those signals.

Please help, I also use FreeMaster so having the stand-alone and the Freedom boards connected while operating is required. I just don't want to hurt anything.

Thank you!

Andy.

Re: freedom board as programmer

jeremyzhou — Mon, 25 Jul 2016 04:38:39 GMT

Hi Andy,

Regarding to your query, I'd highly recommend you to use the 3.3-5 logic convert chip. I think it's good way to work it out.

You can learn the more information about it by through the link as below.

http://www.nxp.com/documents/application_note/AN240.pdf
Have a great day,
Ping

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