Interfaces Power; Dc-In Connectors; Power Architecture Configuration; Coin Cell/Supercap - Digi ConnectCore 8M Mini Hardware Reference Manual

Interfaces

Power

DC-in connectors

The input voltage of the ConnectCore 8M Mini Development Board is 5 V. You can use one of two
connectors to power the entire system. Note that you can only enable one at a time.
DC-in power jack connector
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J2, a 2-pin, 2.54 mm pitch connector:
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Pin Signal name Description
1 VIN
2 GND
An overvoltage circuit protects the board from overvoltage and overcurrent events. Downstream from
these input power protections, there are three regulators/switches for powering both the SOM and
the carrier board circuitry:
MCA LDO (U2): This regulator generates the 3.3 V that powers the on-module MCA.
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5 V Load switch: A 5 V load switch controls the power delivery to some interfaces (CAN, HDMI,
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LVDS).
3.3 V On-board regulator (U4): This buck regulator powers the XBee and PCIe sockets.
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Power architecture configuration

SOM input supply Power rail connected to
VSYS
VCC_MCA
VDD_USDHC2
VDD_ENET
VDD_UART

Coin cell/Supercap

A 70 mF supercap supports RTC applications. Connector J4 on the board is included for attaching a
coin-cell:
Pin Signal name Description
1 VCC_RTC
2 GND
ConnectCore 8M Mini Development Board Reference Manual
5 V power supply rail
Ground
VIN (input supply of the board) 5V
Dedicated 3.3V regulator
MUX_3V3_1V8
1V8
3V3
Power supply for RTC
Ground
Nominal operating voltage
3V (considering forward diode)
3.3V
1.8V
3.3V
Power
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