AVDT-BOB
User’s manual
v1.6
Page 25 / 25
5.2
GPIO Connection for “GPO” mode
The GPIO can be configurable as a GPO via the software interface. In this case, the GPIO
must be wired as displayed bellow:
Notes
:
✓
GPOs are Open-Collector type and must be
pulled high to have a ‘1’ logic level. Otherwise,
pin will be floating (High-Z).
✓
It can be done via Vcc pin, or any external power
supply referenced to device ground (+60V max).
Max current through each pin is 500mA.
✓
Devices like relays or LEDs can be plugged
directly between Vcc and GPOx.
5.3
GPIO Connection for “
Fader
”
mode
The GPIO can be configurable as a Fader via the software interface. In this case, the GPIO
must be wired as displayed bellow:
Notes
:
✓
Each Fader/ADC is weakly pulled down to 100K
Ω
.
✓
Each Fader/ADC is linear to its input voltage in a
range of is 0 to +10V referenced to device
ground.
▪
0V referees to « minimum » value
▪
+10V referees to « maximum » value.
✓
VCC provides a voltage between 11.5V and 12V
✓
It is possible to connect GPIO in fader mode using
for instance a linear potentiometer of 5K
Ω
plugged after a resistance of ~ 750
Ω
between
Vcc and Gnd as shown on left diagram.
1
2
3
4
G
+12
AVDT-BOB Internal logic
1 to 100k
GPO#1
GPO#2
GPO#3
1
2
3
4
G
Vcc
100k
AVDT-BOB Internal logic
ADC #1
. . .
5k
Linear
750
V
Vcc
