The ConnectCore 8X System-on-module
Power interfaces
ConnectCore® 8X System-on-Module Hardware Reference Manual
15
PMIC
regulator
SoM power
rail name
Input
power
supply
Internally
used
Externally
available
Comments
VSNVS
VCC_SNVS_
LDO_1V8
VSYS / VCC_
LICELL
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.
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 supercapacitors. 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
.
In addition to the input power supplies of the PMIC, other power domains of the SOM must also be set
externally. This allows power management flexibility so you can adapt the input voltage of the
different interfaces. The following table lists the input power rails that must be powered externally to
the SOM together with the devices/power domains they power:
Input rail
Device
being
powered
Internal power domains being
powered
Description
VDD_USDHC1
i.MX 8X CPU
VDD_USDHC1_1P8_3P3
Input power supply
for the USDHC1
interface. This
interface is typically
connected to a
microSD socket,
which also allows
booting from the
microSD card. Digi
recommends that
this power domain
be connected to a
flexible power
supply (LDO3/4) so
it can work at its
highest speed by
adjusting input
voltage level.
VDD_MIPI_DSI_DIG
i.MX 8X CPU
VDD_MIPI_DSI_DIG_1P8_3P3
Input power supply
for DSI0 and DSI1
dedicated GPIOs
and I2C buses.
