Other Parts Discussed in Thread: LAUNCHXL-CC26X2R1
Hi,
I have custom PCB similar to LAUNCHXL-CC26X2R1. All the MCU circuit is similar except the power supply area.
I have USB connector which converts 5V to +3.3V and is connected to MCU.
I have everything working good, but following issue. If you have any recommendations, please suggest.
When working, I have UART working. Now I disconnect the USB cable, stopping the power to the PCB.
But MCU keeps on working. It's getting power from pin-4 of FTDI (USB to TTL serial adapter), which is connected to RXD (DIO2) of the MCU.
I run my program on the LAUNCHXL-CC26X2R1 and there is no issue, when I go thru the same sequence. And it stops working as soon as I unplug USB power.
On LAUNCHXL-CC26X2R1 schematic, I see that there are 3.6V (SW_VDD) and 3.3V (ET_VDD). I don't have 3.6V converter on my PCB.
Is that could be reason?
Thanks
Kiran
