User Manual

TMCM-1140 Hardware Manual (Rev. 1.01 / 2012-JUL-27) 13
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3.2.2.2 Analog Input AIN_0
The eight pin connector of the TMCM-1140 provides one dedicated analog input AIN_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
AIN_0
ADC input
(microcontroller)
22k
10k
100nF
GND
GND GND
Figure 3.8 General purpose inputs (simplified input circuit)
3.2.2.3 Outputs OUT_0, OUT_1
The eight pin connector of the TMCM-1140 offers two general purpose outputs OUT_0 and OUT_1. OUT_1
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).
In case free-wheeling diodes are connected to VDD supply voltage:
None of the two outputs should be connected to any voltage above supply voltage of the module.
VDD
microcontroller
GND
Figure 3.9 General purpose output OUT_1