13
Jack 3.5mm connector (GPIO1/IR)
N°
Name
Write/Read
Control
1
Voltage reference 3.3V
2
GPIO1
IN or OUT
CPU/GPIO1
3
Ground
Electrical features
Vin min
Vin max
VOH min
VOL max
VIH min
VIL max
GPIO1
-0.95V
4.6V
2.4V
0.4V
2.0V
0.8V
The 3.3V pin must not be used as a power supply, but rather as a reference voltage.
During boot, the GPIO1 is configured in input during some seconds. And then a er the system startup, the GPIO1 is opera onal.
The GPIO has a weak pull-up.
It is not recommended to hotplug/unplug the GPIO1 connector, which could damage the device.
Principle schema cs for several use cases
Three wires input configura on for GPIO1:
Two wires input configura on for GPIO1:
Output configura on for GPIO1:
3.3V
CPU/GPIO1
DME204
Switch
Input
2 (Jack)
3 (Jack)
1 (Jack)
PERIPHERAL
CPU/GPIO1
DME204
Switch or dry loop
Input
2 (Jack)
3 (Jack)
PERIPHERAL
CPU/GPIO1
DME204
Logic gate, transistor or opto-coupler
Output
Power supply
+
-
2 (Jack)
3 (Jack)
PERIPHERAL
