User Manual

TMCM-3351 Hardware Manual • Hardware Version V1.00 | Document Revision V0.91 • 2017-JUL-11

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The TMCM-3351 oﬀers on-board line-termination for the RS485 bus (120R). For proper operation the

RS485 bus should be terminated at both ends of the bus. For any intermediate nodes / bus connections

please remove line termination jumper (see 5, also).

In contrast to the TMCM-351 the TMCM-3351 does not require any jumper setting / selection in order to

enable RS485 connection. RS485 communication is available after power-up (power supply input) without

any further conﬁguration.

4.9 SPI connector

For extension of the available inputs and outputs an SPI interface is available. A standard 2.54mm pitch

two row header is used as connector for the SPI interface available externally.

Pin Label Pin Label

1 SPI_MOSI 2 GND

3 SPI_MISO 4 GND

5 SPI_CLK 6 GND

7 SPI_SEL0 8 SPI_SEL2

9 SPI_SEL1 10 +5V_output

Table 13: SPI connector

4.10 I/O Connector

The general purpose I/O connector oﬀers 8 digital and analog inputs and 8 digital outputs. All inputs are

+24V compatible. All outputs oﬀer open collector driver stages. OUT_0. . . 5 can sink up-to 100mA while

OUT_6. . . 7 are more powerful and can sink up to 2A. A standard 2.54mm pitch two row header is used for

this connector.

Pin Label Pin Label

1 OUT_0 2 OUT_1

3 OUT_2 4 OUT_3

5 OUT_4 6 OUT_5

7 OUT_6 8 OUT_7

9 +5V_output 10 GND

11 IN_0 12 IN_1

13 IN_2 14 IN_3

15 IN_4 16 IN_5

17 IN_6 18 IN_7

19 /Shutdown 20 VDD

Table 14: I/O connector

The /Shutdown input pin has to be connected to the supply voltage in order to enable the driver stages for

all three stepper motor axes. A jumper between pin 19 and pin 20 can be used to permanently enable

drivers (please refer to section 5 for more detailed information).

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