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3 - 14
3.2.7
Digital IO
Digital input (DI1-DI4) and output (DO1-DO4) ports are provided on the multi IO connector (refer to
table 7).
1
9
2
10
CAUTION
The digital IO must be powered by a SELV power supply, that complies with the
requirements of a limited energy source (LPS) (By using an appropriate supply or an
external fuse).
The digital inputs and outputs are isolated from system power supply. Refer to figure 5 for detailed
schematic.
Load
The digital input signals (DI1-DI4) refer to GND-IO and have an input impedance of about 5 kΩ.
Switching level for low is ≤4V and high ≥9V. The digital inputs do not require VIO to be present.
The digital outputs drive VIO power to the output pins (high side switch). The load must be connected
between the output pin and the return of the VIO power supply.
The output driver supports resistive and inductive loads.
NOTICE
When using inductive loads, the output driver has internal clamping to demagnetize the
load. This clamps the output pin to about 55 V below VIN. When using this feature, very
carefully evaluate that the demagnetization energy does not overheat the output driver.
Parameters to check are the switching frequency, the load current, the load inductance
and VIO voltage. Refer to the VN330SP datasheet for more information. If in doubt, add
external clamping circuits.
© Janz Tec AG
emVIEW-7/RPI3 (Hardware and Software Manual) • Installation
Polarity
Reversal
Protection
VIO
DO
DI
GND-IO
figure 5: digital IO detailed schematic
1
DO4
3
DO2
5
GND-IO
7
DI4
9
DI2
table 7: Digital IO connector pins
VN330SP
2
DO3
4
DO1
6
VIO (10..32 VDC)
8
DI3
10 DI1
Output GPIO
Input GPIO
Rev. 1.0
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