FRDM-K66F - VREG_IN Connections

odd_bikes — Tue, 13 Nov 2018 11:23:17 GMT

Hi,

We've been battling with issues regarding the HW connectivity for our K66-based boards for a few days now. While most (if not all) technical documents from NXP mention the need to have at least one of the VREG_IN pins connected to 5V, the FRDM-K66F board seemed to do without this. Notice the J16 having the DNP notation and searching fro VREGIN_K66 in the schematic returns nothing else besides this. However, I measured both sides of J16 and they both have 5V, so it seems the schematic is wrong.

More importantly, what should the USB connections be, for a device that's going to be self-powered and never act as a host? (We're using USB1 High Speed).

Thanks!

Re: FRDM-K66F - VREG_IN Connections

mjbcswitzerland — Wed, 14 Nov 2018 00:15:33 GMT

Hi Alex

The dots under the jumper means that there is a short circuit between the pins as default, which is designed to be cut if needed and a real jumper (not mounted by default) soldered in.

If you look at the bottom of the board you will see a number of such 0.1" spaced jumper holes connected together - the shorting tracks are not covered with mask and so are golden in color.

Regards

Mark

topic FRDM-K66F - VREG_IN Connections in Kinetis Microcontrollers

FRDM-K66F - VREG_IN Connections

Re: FRDM-K66F - VREG_IN Connections