All builds are made.
2 successful with MKL04 from the second delivery
and
1 not successful with the chip from the first delivery, which was checked before installation and had a 3.2V on the 18th leg with a 3.3V power supply.
The chips from the second delivery did not even check.
Redid the PCB under the chip MKL02, I will acquire them today.
I have a question, yet this question is off-topic.
I reviewed the entire forum, but did not find the answer.
Is it possible to somehow change the CPU Clock programmatically and reduce the clock to reduce battery consumption, say, from the 72MHz frequency clock to 48 or 24 MHz?