System-On-Module Power Rails Distribution - Digi ConnectCore 8X Hardware Reference Manual

The ConnectCore 8X System-on-module

System-on-module power rails distribution

The ConnectCore 8X requires three primary power supply inputs: VSYS, VSYS2, and VCC_MCA:
VSYS and VSYS2 are the input power supplies to the on-module NXP PF8100 Power
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Management IC (PMIC), as well as to most of its regulators. Some PMIC regulators are internally
dedicated to powering the module, while others power external circuitry.
VCC_MCA is the input power supply of the on-module Digi Microcontroller Assist.
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Two additional linear dropout regulators (LDO3 and LDO4), which have a dedicated input power line,
are available to power carrier board external circuitry. These additional regulators are not mandatory.
The following table summarizes the PMIC regulators of the ConnectCore 8X SOM:
PMIC SoM power
regulator rail name
SW1
SW2
SW3
SW4
SW5
SW6
SW7
LDO1 VCC_SCU_1V8
LDO2 VDD_EMMC0
LDO3
LDO4
ConnectCore® 8X System-on-Module Hardware Reference Manual
Input
power
supply
- VSYS2
- VSYS2
- VSYS2
- VSYS2
- VSYS2
1V8 VSYS2
3V3 VSYS
VSYS2
VSYS2
LDO3 LDO3IN
LDO4 LDO4IN
Internally Externally
used available
YES NO
YES NO
YES NO
YES NO
YES NO
YES YES
YES YES
YES YES
YES YES
NO YES
NO YES
Power interfaces
Comments
General purpose 1.8V
power rail for external
circuitry. Also used
internally in the SOM .
General purpose 3.3V
power rail for external
circuitry. Also used
internally in the SOM .
Power supply for the i.MX
8X System Control Unit
(SCU). Digi recommends
not using this power rail
externally unless
otherwise noted.
Used for powering the
internal eMMC memory
chip. Digi recommends
not using this power rail
externally unless
otherwise noted.
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