![background image](http://html1.mh-extra.com/html/engicam/0026700082i010/0026700082i010_getting-started-manual_2412868027.webp)
In order to reduce the module consume during the power down Engicam provide the module with the pin 3V3_ETH that give to the user
the possibility to switch off the Ethernet PHY during this working mode (command
echo mem > /sys/class/power/state
).
These pins 15, 17, 19 of the B Connector (J2) can be connected, on the carrier board, to the 3V3 using a circuitry as the follow.
Figure 8
The system is under validation otherwise it’s strongly recommended to plan a bypass circuitry (e.g. R1 in the figure) to allow the directly
connection of 3V3_ETH with +3V3
To optimize the SOM current consumption during power down state Engicam has arranged the power supply of the PHY Ethernet to
work independently by the rest of the module
For this reason a 3V3_ETH pin is available on B connector. The pins can be connected as shown in the figure to allow to the signal
GPIO4_14 to switch off the Phy Ethernet using command
echo mem > /sys/class/power/state
that puts the module into a power down state
This system has yet to be validated, so it is advisable to mount the circuit of a bypass system to the enclosure, see 0 ohm resistor “not
mount” in the figure
D N :
2 7