14.4.5.2 Configuration

The voltage regulators can be configured by the VREG_CTRL register.

It is recommended to use the internal regulators, but it is also possible to supply the low voltage domains by an external voltage supply. For this configuration, the internal regulators need to be switched off by setting the register bits to the values AVREG_EXT = 1 and DVREG_EXT = 1. A regulated external supply voltage of 1.8V needs to be connected to the pins 13, 14 (DVDD) and pin 29 (AVDD). Even if DVDD and AVDD are connected to an external supply, it is required to connect VDD to an external supply. When providing the external supply, ensure a sufficiently long stabilization time before interacting with the AT86RF212B.

Disabling the internal regulators increases total SLEEP current for DVDD/DEVDD to 800nA/150nA. Note that the combined nominal current for DEVDD is only 200nA with internal regulators enabled.