PD-1141 Hardware Manual (Rev. 1.04 / 2013-JUL-23)
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3.3.2.2
Analog Input AIN_1
The eight pin connector of the PD-1141 provides one dedicated analog input AIN_1.
This dedicated analog input offers a full scale input range of 0… +10V with a resolution of the internal
analog-to-digital converter of the microcontroller of 12
bit (0… 4095).
The input is protected against higher voltages up-to +24
V using voltage resistor dividers together with
limiting diodes against voltages below 0
V (GND) and above +3.3
V DC (see figure below).
+3.3V
AIN_1
ADC input
(microcontroller)
22k
10k
10nF
GND
GND
GND
Figure 3.6 General purpose inputs (simplified input circuit)
3.3.2.3
Outputs OUT_0, OUT_1
The eight pin connector of the PD-1141 offers two general purpose outputs OUT_0 and OUT_1. These two
outputs are open-drain outputs and can sink up to 100
mA each. The outputs of the N-channel MOSFET
transistors are connected to freewheeling diodes each for protection against voltage spikes especially
from inductive loads (relais etc.) above supply voltage (see figure below).
Using free-wheeling diodes connected to VDD supply voltage:
None of the two outputs should be connected to any voltage above supply voltage of the module.
VDD
OUT_0,
OUT_1
microcontroller
GND
Figure 3.7 General purpose outputs
