SWCU192 November 2021 CC1312R7 , CC1352P7 , CC2652P7 , CC2652R7
The digital core of the CC13x2x7 and CC26x2x7 device platform is supplied by a 1.28 V regulator connected to VDDR. The output of this regulator requires an external decoupling capacitor for proper operation; this capacitor must be connected to the DCOUPL pin.
The DCOUPL pin cannot be used to supply external circuitry.
When the system is in power down, a small low-power regulator (micro LDO) with limited current capacity supplies the digital domain to ensure enabled modules still have power.