Qeedji 4.13.15 002E, User Manual

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Video input connector (HDMI 1.4)
Jack 3.5 mm connector (GPIO1/IR)
N° Name Write/Read Control
1 Voltage reference 3.3 V
2 GPIO1 IN or OUT CPU/GPIO1
3 Ground
Electrical features
Vin min Vin max VOH min VOL max VIH min VIL max
GPIO1 -0.5 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 power supply, but rather as a reference voltage.
Along the device booting, the GPIO1 is configured as input during some seconds. And then after the system startup, the GPIO1 is operational.
The GPIO has a weak pull-up.
It is not recommended to hotplug/unplug the GPIO1 connector, which could damage the device.
Principle schematics for several use cases
Three wires input configuration for GPIO1:
Two wires input configuration for GPIO1:
Output configuration for GPIO1: