IS GND_SW(PIN13) connected to digital GND（EXPAD) inside?
The reasons to want to know are as follows：
When EXPAD is unconnected, I investigate what happens.
I am reliable if PIN13 and digital GND are connected inside.
The default status is that the GND_SW is disconnected from internal analog ground.
The bit7 of ADCxCFG register can be configured to decide the status of the GND_SW.
It's strong recommended that connect EXPAD to DGND.
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