The ConnectCore 8X System-on-module
Power interfaces
ConnectCore® 8X System-on-Module Hardware Reference Manual
14
System-on-module power rails distribution
The ConnectCore 8X requires three primary power supply inputs: VSYS, VSYS2, and VCC_MCA:
n
VSYS and VSYS2 are the input power supplies to the on-module NXP PF8100 Power
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.
n
VCC_MCA is the input power supply of the on-module Digi Microcontroller Assist.
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
regulator
SoM power
rail name
Input
power
supply
Internally
used
Externally
available
Comments
SW1
-
VSYS2
YES
NO
SW2
-
VSYS2
YES
NO
SW3
-
VSYS2
YES
NO
SW4
-
VSYS2
YES
NO
SW5
-
VSYS2
YES
NO
SW6
1V8
VSYS2
YES
YES
General purpose 1.8V
power rail for external
circuitry. Also used
internally in the SOM.
SW7
3V3
VSYS
YES
YES
General purpose 3.3V
power rail for external
circuitry. Also used
internally in the SOM.
LDO1
VCC_SCU_1V8
VSYS2
YES
YES
Power supply for the i.MX
8X System Control Unit
(SCU). Digi recommends
not using this power rail
externally unless
otherwise noted.
LDO2
VDD_EMMC0
VSYS2
YES
YES
Used for powering the
internal eMMC memory
chip. Digi recommends
not using this power rail
externally unless
otherwise noted.
LDO3
LDO3
LDO3IN
NO
YES
LDO4
LDO4
LDO4IN
NO
YES
