58.2.2 Power Supply Connections

The following figures illustrate the recommended power supply connections for switched/linear mode, linear mode only and with battery backup.

Figure 58-1. Power Supply Connection for Switching/Linear Mode
Note:
  1. VDDIOB is available only on the SG41 device.
Figure 58-2. Power Supply Connection for Linear Mode Only
Note:
  1. VDDIOB is available only on the SG41 device.
Figure 58-3. Power Supply Connection for Battery Backup Mode
Note:
  1. VDDIOB is available only on the SG41 device.
Table 58-1. Power Supply Connections (1,2)
Signal NameAssociated GroundRecommended Pin Connection
VDDVSSCapacitors: refer to REG_5
AVDDAVSSCapacitors: refer to REG_17

Ferrite Bead(3): Refer to REG_23/REG_25

VDDIOBVSS

Capacitors: refer to REG_54(4)

VDDCOREVSSCapacitors: refer to REG_1
VSW -BUCK mode: Inductor required to VDDCORE: Refer to REG_27/REG_29/REG_31

LDO mode: Not Connected

VBAT (PB03)VSS Capacitors: refer to REG_13
Note:
  1. REG_X values: Refer to the Power Supply Electrical Specifications from the Electrical Characteristics chapter.
  2. Decoupling capacitors must be placed close to the device, low ESR capacitors must be used for better decoupling.
  3. A ferrite bead must be added between the main power supply (VDD) and AVDD to attenuate high-frequency digital noise from entering the analog power domain. The bead must provide enough impedance to help isolate digital and analog power domains. Make sure to select a ferrite bead with a low DC resistance to avoid any relevant IR drop across the ferrite bead that could impact analog peripherals performance.
  4. The VDDIOB pins are available only on the SG41 devices.
  5. VDDIOB must be lower or equal to VDDIO and VDDANA.
  6. When I/O pads in the VDDIOB cluster are multiplexed as analog pads, VDDANA is used to power the I/O. Using this configuration may result in an electrical conflict if the VDDIOB voltage is different from that of VDDIO and VDDANA. If the application has such requirements, it is required to power VDDIOB, VDDIO, and VDDANA from the same supply source to ensure that they are always at the same voltage.