Qeedji SMH300, User Manual

Page: 13 / 80

13
1.4 Connectors pin-out
Power supply connector (12 V DC - 1.2 A)
LAN connector
Ethernet RJ-45 PoE. 10/100 BaseT. It is recommended to use shielded cables.
J ack 3.5 mm connector (G PIO1)
N° Name Write/ Read Control
1 Voltage reference 3.3 V
2 GPIO1 IN or OUT CPU/GPIO1
3 Ground
Electrical features
V in min V in max V OH min V OL max V IH min V IL max
GPIO1 -0.5 V 3.6 V 2.9 V 0.4 V 2.0 V 0.8 V
The 3.3 V pin must not be used as a power supply, but rather as a reference voltage.
Along the device booting, the GPIO is configured as input during some seconds. And then after the system startup, the GPIOs is operational.
The GPIO has a weak pull-up.
It is not recommended to hotplug/unplug the GPIO1 connector, which could damage the device.