Internal Power Domains - Digi ConnectCore 8X Hardware Reference Manual

The ConnectCore 8X System-on-Module
PMIC SoM power
regulator rail name
SW1
SW2
SW3
SW4
SW5
SW6 1V8
SW7 3V3
LDO1 VCC_SCU_1V8
LDO2 VDD_EMMC0
LDO3 LDO3
LDO4 LDO4
VSNVS VCC_SNVS_
LDO_1V8
Note VCC_LICELL is the input power for the PMIC VSNVS regulator, which is normally used to power
the CPU in low-power mode (RTC). This pin also supports coin cell charger functionality for Li-ion
rechargeable batteries or super capacitors. However, RTC mode in the ConnectCore 8X is
supported by the ConnectCore 8X MCA, not by the i.MX 8X. Therefore, in order to supply the RTC of
the system, do not use VCC_LICELL as an input power rail. Instead, follow the configuration
explained in RTC power and coin cell

Internal Power Domains

In addition to the input power supplies of the PMIC, there are other power domains of the SoM which
must be set externally. This allows flexibility regarding power management, so that the input voltage
ConnectCore® 8X System-on-Module Hardware Reference Manual
Input
power Internally
supply
- VSYS2
- VSYS2
- VSYS2
- VSYS2
- VSYS2
VSYS2
VSYS
VSYS2
VSYS2
LDO3IN
LDO4IN
VSYS / VCC_
LICELL
charger.
Externally
used available
YES NO
YES NO
YES NO
YES NO
YES NO
YES YES General purpose 1.8V power
rail for external circuitry. Also
used internally in the SoM.
YES YES General purpose 3.3V power
rail for external circuitry. Also
used internally in the SoM.
YES YES Power supply for the i.MX 8X
System Control Unit (SCU).
Recommendation is to not use
this power rail externally,
unless otherwise noted.
YES YES Used for powering the internal
eMMC0 memory.
Recommendation is not to use
this power rail externally,
unless otherwise noted.
NO YES
NO YES
YES YES An always-on power domain of
the CPU that powers some
core functionality of the SoM.
Do not use this power rail
externally.
Power interfaces
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