User Manual

TMCM-1070 Hardware Manual • Hardware Version V1.00 | Document Revision V1.10 • 2017-Oct-27

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5.2 Optically Isolated Inputs with Common Anode Input

The control inputs of the TMCM-1070 are optically isolated (not the TTL UART interface). All optocouplers

share one common anode (COMM) input as shown in the ﬁgure above.

+5V

3.3V to +6V

Driver &

Controller

TMCM-1070 /

PD-x-1070

GND

DIR

STEP

CHOP

User

MCU

COMM

270 Ω

Figure 9: Inputs with common anode input with 3.3V to 6V

The typical voltage at COMM input is 5V. Nevertheless, 3.3V or voltages higher than 5V can also be used as

long as the current is through the optocouplers’ emitter is between 5mA to 20mA. For 3.3V operation the

controller must be carefully selected with respect to its I/O ports, its actual output voltage, and the series

resistor of the I/O ports. The user must make sure that the current through the optocouplers’ emitter is

between 5mA to 20mA.

Note

Step pulse width

Width of the step pulses should be between 2

s and 4

s, for maximum step

frequency.

With a larger step pulse width, for example 50% duty cycle coming from a fre-

quency generator, the maximum input frequency will be lower at ca. 9kHz..

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