13
1.4
Connectors
Power supply connector (12VDC-1.2A)
LAN connector
Ethernet RJ-45. 10/100 BaseT. It is recommended to use schielded calbe.
Jack 3.5 mm connector (GPIO4)
N°
Name
Write/Read
Control
1
Voltage reference 3.3V
2
GPIO4
IN ou OUT
CPU/GPIO4
3
Ground
GPIO4 Electrical features
Vin min
Vin max
VOH min
VOH max
IOH max
VOL max
IOL max
VIH min
VIL max
GPIO4
-0.5V
3.8V
3.1V (-20 µA)
5V
-100µA
0.6V (2mA)
5mA
2.35V
0.8V
The pin 3.3V must not be used as a power supply, but rather for voltage reference. A fuse (350mA @ 20°C) allows to cut the power in case current is more than 350mA. Then the
fuse can be manually re-armed. During board (re)star ng, the defaut level for GPIO4 is 3.3V
The GPIO4 has:
one 4.7 KOhms pull-up to 3.3V,
one 182 KOhms pull-down to 0V.
Principle schema cs of several use case
Three wires input configura on for GPIO4:
Two wires configura on for GPIO4:
+
ST
PW
DC IN
IR
LAN
PoE
3 2 1
IR
LAN
PoE
3.3V
CPU/GPIO4
SMT210
Switch
Input
2 (Jack)
3 (Jack)
1 (Jack)
PERIPHERAL