The on board voltage regulator lends itself for use in powering more than just certain power pins on the EFR32 itself. Typically the DC-DC is recommended for powering the EFR32 RFVDD, DVDD and sometimes the PAVDD power pins (for desired transmit power levels 13 dBm and lower). There may also be custom applications where it is appropriate to use the DC-DC regulated output for powering additional EFR32 power supply pins or even other device power pins. In cases where the DC-DC is to be used for powering peripherals and / or the IOVDD supply, the designer should:
Note that all validation testing has been at 1.8V and therefore datasheet parameters may be different for DC-DC outputs other than 1.8 V.
If one of the peripheral devices is also an EFR32, do not power that EFR32’s DVDD pin, due to DVDD will short to AVDD internally upon exiting reset and cause a potential over-current situation for the source DC-DC.
For additional information about the EFR32 DC-DC, please review the application note AN948.
When done, Silicon Labs recommends you submit your finalized design for review in the customer portal.