Power; Power Input; Power Over Usb; Power Control - Enclustra Mars EB1 Base Board User Manual

5 Power

5.1

Power Input

The Mars EB1 base board can be powered using one of the power input sources listed below:
External power connection through J1300 connector
Internal power connection through J1302 connector
USB VBUS power connection
5.2

Power over USB

As soon as a USB cable is plugged into the Mars EB1 base board, the system controller and the FTDI USB
2.0 device controller are powered over USB; this will cause the SC LED to blink.
If external USB power is enabled, the Mars EB1 base board and the mounted Mars module are powered
over USB. In this case, VCC_MAIN is connected to the USB input voltage. Table 15 describes the VBUS power
control; the factory default is marked in bold.
DIP Switch CFG A 2
OFF
ON
Table 15: USB - VBUS Control
Warning!
If the Mars module is powered via USB, make sure that it does not consume more power than the USB
specification allows.
5.3

Power Control

Power control is enabled and disabled by the PWR_ON# signal, determined by the position of the DIP switch
CFG A 4. Table 16 describes the power control configuration; the factory default is marked in bold.
DIP Switch CFG A 4
OFF
ON
Table 16: Power Control Switch Configuration
D-0000-307-001
USB_PWR_EN# Effect
1 USB power is not connected to the VCC_MAIN domain.
An external 12 V supply must be connected to the
board.
0 USB power (5 V) is connected to VCC_MAIN domain. The
Mars EB1 base board is powered via the USB connector (J401
or J402).
PWR_ON# Effect
1 Power control is ON
0 Power control is OFF
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