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Input / Output 4-11MN1928
4.5 Other I/O
4.5.1 Stepper control outputs
The stepper control outputs are available across a range of pins, as shown in section 4.2.1.
There are four sets of stepper motor control outputs, operating in the range 10Hz to 1MHz.
Each of the step (pulse) and direction signals from the NextMove ES is driven by a ULN2003
open collector Darlington output device.
The ULN2003 has a maximum power dissipation of 900mW at 25°C. The total combined
output requirements of DIR0 - DIR2 and STEP0 - STEP2 must not exceed this limit. The
maximum current limit for an individual output is 400mA if only one output is in use, reducing to
50mA if all outputs are in use. These limits are for a 100% duty cycle.
DIR3 and STEP3 are sourced from the same ULN2003 device as the DOUT8 - DOUT11
outputs (see section 4.4.2.2), so the current demands of these signals must also be
considered.
It is recommended to use separate shielded cables for the step outputs. The shield should be
connected at one end only.
NextMove ES
STEP0
DGNDa3
a14
ULN2003
Step
Output
74AHCT244
GND
Figure 10 - Stepper output - STEP0 output shown