PD-1140 Hardware Manual (Rev. 1.02 / 2013-MAR-26)
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All three digital inputs are connected to the on-board processor and can be used as general purpose
digital inputs (default).
4.3.2.2
Analog Input IN_0
The eight pin connector of the TMCM-1140 provides one dedicated analog input IN_0.
This dedicated analog input offers a full scale input range of 0… +10
V with a resolution of the internal
analog-to-digital converter of the microcontroller of 12bit (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
IN_0
ADC input
(microcontroller)
22k
10k
100nF
GND
GND
GND
Figure 4.8 General purpose inputs (simplified input circuit)
4.3.2.3
Outputs OUT_0, OUT_1
The eight pin connector of the TMCM-1140 offers two general purpose outputs OUT_0 and OUT_1. OUT_0
is an open-drain output capable of switching up to 1A. The output of the N-channel MOSFET transistors is
connected to a freewheeling diode for protection against voltage spikes especially from inductive loads
(relais etc.) above supply voltage (see figure below).
Note
:
OUT_0 offers a freewheeling diode connected to VDD supply voltage. Therefore, this output should never
be connected to any voltage above supply voltage level of the module.
VDD
microcontroller
GND
Figure 4.9 General purpose output OUT_0
