Hardware description
Figure 7: Power supply options (board back)
8.3.1 5 V power sources
The nRF52833 DK board has a 5 V boost regulator.
It gives a stable 5 V output from four possible sources:
• USB connector J2 for the interface MCU
• USB connector J3 for the nRF52833 SoC
• Li-Po polymer battery connectors (J6 or P27)
• VIN 3–5 V pin on P20
Each of these sources has a reverse protection diode to prevent current flowing in the wrong direction if
multiple sources are connected at the same time.
Figure 8: 5V regulator and protecting diodes
8.3.2 VDD power sources
The main board supply (VDD) can be sourced from the 5 V domain, external power supply, and coin cell
battery.
For the 5 V domain, there are two regulators, one fixed 3 V buck regulator and one voltage follower
regulator that follows the VDD_nRF voltage. The coin cell battery and external power supply are not
regulated.
• 5 V domain:
• Fixed 3 V buck regulator
• VDD_nRF voltage follower
• External power supply
• Coin cell battery
For more information about power sources, see section nRF52833 power source on page 22.
The power sources are routed through a set of load switches, which are controlled by logic to prioritize the
power sources in the correct manner.
4452_198 v1.0
18
To Next Page
