Hi,
I want to know do i need external logic circuit (OR circuitry) while switching from VDD to VBAT
(coin cell battery for RTC) and vice versa or
switching will happen internally between VDD to VBAT and VBAT to VDD depending on detection of
supply voltage VDD by internal logic in MK70FN1M0VMJ12
Kindly reply at earliest
Thanks and regards,
Puspam N
解決済! 解決策の投稿を見る。
Hi Adrian,
Thanks for the clarification. This information will definitely going to help for the projects using freescale microcontroller.
Best and Warm Regards
Puspam Nayak
Hi Adrian,
Thanks for the clarification. This information will definitely going to help for the projects using freescale microcontroller.
Best and Warm Regards
Puspam Nayak
Achieved externally with a dual-schottky-diode device like BAT54C.
Thanks Earl. Information will help...
Thanks once again
Regards,
Puspam N
Hi Earl,
Thanks for giving this valuable information and for sharing schematic for VBAT hardware connection.
I have a question on this, i am using two K70 micrcontroller on my board. One K70 will have RTC battery back-up using Coin cell and for other K70 we dont need power for RTC so in that case can i keep VBAT pin open or that has to be terminated to ground.
Kindly suggest on this query
Thanks and Regards,
Puspam N
Hi,
If you are not planning to use the RTC module then you can leave the VBAT pin floating; try to never access to the RTC registers to avoid bus faults and also the RTC clock gate in the SIM register should it remains in value 0.
Hope this information can help you.
Regards,
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