Bring-Up Guidelines; Power-Up; Power Rails - Digi ConnectCore 8X Hardware Design Manuallines And Checklist

Bring-up guidelines

This section offers guidelines for performing bring-up of a ConnectCore 8X-based product.

Power-up

The very first power-up of a product is one of the most critical step of the bring-up. Use a power
supply with current limiter so the system is protected in case an unexpected short (or any other high-
current incident) occurs. The SOM will not have a static power consumption higher than 200-250 mA
from factory mode (except booting peaks). So, together with the expected power consumption of the
carrier board, you can estimate an upper limit for the current consumption in the bring-up.

Power rails

Once you have verified that the power consumption of the system is acceptable and no shorts are
present, the next step is to verify that all power rails also have their expected voltage value. The
following table tracks the voltage expected in the main power domains of the system:
Power rail
VSYS/VSYS2
VCC_MCA
3V3
1V8
VCC_SCU_1V8
VDD_PCIE_DIG
VDD_EMMC0
NVCC_MIPI_CSI_
DSI
If all these power rails are in compliance with their expected voltage value, it means that the system
is completely powered. The PMIC has already initialized and the SOM should boot.
ConnectCore 8X Hardware Design Guidelines
Expected voltage
5 V
3 V - 3.3 V (Output of the 3.3 V dedicated regulator minus Schottky diode
forward voltage).
3.3 V
1.8 V
1.8 V
3.3 V
3.3 V
1.8 V
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