#L010068 #L010068
15 16
MICROSTEP SELECTION FULLSTEP OUTPUT SIGNAL
The number of microsteps per step is selected by switches 1, 2, 3, and 4 of the DIPThe MDM40001 has an active LOW open drain output at Connector P1, Pin 7 labeled
switch. Table 5 shows the standard resolution values along with the associated inputs ON F/S OUT. This output is TRUE (active low) for the duration of the full step. A full
for the select switches 1, 2, 3 and 4. The standard waveforms are sinusoidal. step occurs when either Phase 1&3 or Phase 2&4 cross through zero (ie. full current in
Resolution Steps/ Select 1 Select 2 Select 3 Select 4
Rev
2 400 ON ON ON ON
4 800 OFF ON ON ON
81,600 ON OFF ON ON
16 3,200 OFF OFF ON ON
32 6,400 ON ON OFF ON
64 12,800 OFF ON OFF ON
128 25,600 ON OFF OFF ON
256 51,200 OFF OFF OFF ON
51,000 ON ON ON OFF
10 2,000 OFF ON ON OFF
25 5,000 ON OFF ON OFF
50 10,000 OFF OFF ON OFF
125 25,000 ON ON OFF OFF
250 50,000 OFF ON OFF Open
TABLE 5
In order to select the microstepping
swicthes the top cover plate of the driver
must be removed. The dip switches are
located on the top left hand corner as
show on the drawing to the right.
one winding and 0 current in the other winding). This full step position is a common
position no matter what resolution is selected.
This output can be used to count the number of mechanical full steps the motor has
traveled without having to count the number of microsteps in between. A controller that
utilizes this output can greatly reduce its position tracking overhead and thus
substantially increase its throughput.
This high speed MOSFET output is non-isolated and has the ability to sustain the
maximum driver voltage at 25mA maximum.
OPTICALLY ISOLATED INPUTS
The following inputs to the MDM40001 are Optically Isolated.
Item Pin #
Clock 1
Direction 2
On/Off 4
Reset 5
WARNING! If using a voltage other than +5VDC, the current through the optocoupler
must NOT exceed the maximum limit.
The Isolated inputs may be powered by a DC voltage other than +5 VDC. In doing so,
care should be taken to limit this current, an external resistor should be placed in series
with the input pins (1-2, 4-5). The value of the resistor should be calculated such that the
input current is approximately equal to the value listed in the Electrical Specifications.