User Manual

PD42-x-1240 Hardware Manual • Hardware Version V1.20 | Document Revision V1.10 • 2018-DEC-05

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7 I/Os

The I/O connector (8pin JST PH series) oﬀers one analog input, two non-isolated digital inputs with

integrated pull-ups (programmable) and two optically isolated inputs. All inputs can be used for diﬀerent

purposes explained in more detail in the following subsections.

7.1 Analog input IN0

The PD42-x-1240 oﬀers one analog input. The analog input voltage range is approx. 0..+10V. For voltages

above +10V saturation takes place but, up-to 30V higher voltages are tolerated without destroying the input.

For analog to digital conversion the integrated ADC of the on-board microcontroller is used. Resolution of

this converter is 12bit (0..4095).

100nF

10k

22k

2k2

+3V3

microcontroller

IN0

+5V

TMCM-1240

pull-up

disabled

0..10V

Figure 5: Analog input IN0

The analog input can be used as digital input, also. There is an integrated pull-up to +5V which can be

switched on of oﬀ in software. When using this input as anlog input the pull-up should be usually switched

oﬀ.

7.2 Digital inputs IN1 and IN2

The PD42-x-1240 oﬀers two digital inputs IN1 and IN2 which accept signals between 0 and 30V with

voltages above approx. 2.9V recognized as logical ’1’ and below 1V as logical ’0’. Both inputs oﬀer intergated

pull-ups to +5V which can be switched on or oﬀ in software (always together). When using the inputs with

low-side switches (connected to GND), pull-ups usually should be switched on (default). In case high-side

switches are used the pull-ups must be switched oﬀ. For push-pull signals the pull-ups may be either

switched on or oﬀ.

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