TMCM-1070 Hardware Manual • Hardware Version V1.00 | Document Revision V1.00 • 2016-Sept-16
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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.
Figure 9: Inputs with common anode input with 3.3V to 5V
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
µs and 4µs, 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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