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3
1,2
PHASE A Phase A of the stepping motor is connected between pin 1 and pin 2. See section 8.
3
CURRENT
REDUCTION
ADJUST
Phase current reduction adjustment input. A resistor connected between this pin and pin
4 ( if used to set motor phase current ) will proportionately reduce current in both
windings approximately .5 seconds after the last positive edge of the step clock input.
See section 15.
4
CURRENT
REFERENCE
Phase current reference output. A resistor is connected between this 1 mA current
source output and the Ground pin ( pin 11 ) to generate the voltage used to set the peak
phase current in the motor. See section 7.
5
CURRENT
ADJUSTMENT
Phase current adjustment input. A voltage applied to this input sets the peak phase
current in the motor. See section 7.2.
6
FAULT INPUT A low signal on this input will generate a latched fault condition. See section 16.
7-
10
RESOLUTION
SELECT 0-3
Microstep resolution select inputs. Used to select the number of microsteps per step of
the motor. See section 11.
11
SUPPLY
GROUND
Supply voltage ground ( return ). See section 9.
12
+V Supply voltage input. See section 9.
13
RESET INPUT When low, this input will reset the driver ( phase outputs will disable ). When released,
the driver will be at its initial state ( phase A off, phase B on ). See section 14.
14
+5V +5Vdc supply input. This supply is used to power the internal logic. The +5Vdc supply
should be referenced to pin 11( supply ground ). See section 9.2.
15
STEP CLOCK
INPUT
A positive going edge on this input advances the motor one increment. The size of the
increment is dependent on the microstep select inputs See section 13.
16
DIRECTION
INPUT
This input is used to change the direction of the motor. Physical direction also depends
on the connection of the motor windings. See section 13.
17
ENABLE
INPUT
This input is used to enable/disable the output section of the driver. When high, the
outputs are enabled. However, this input does not inhibit the step clock. Therefore when
enabled the outputs will update by the number of clock pulses ( if any ) applied to the
driver while it had been disabled. See section 14.
18
ON-FULL-
STEP OUTPUT
This totem-pole output indicates when the driver is positioned at a full step. This output
can be used to count the number of full steps the motor has moved, regardless of the
number of microsteps in between. This output is active high. See section 12.
19
FAULT
OUTPUT
This totem-pole output indicates a short circuit has occurred or a low signal was
detected on the Fault input. This output is active high. See section 16
20-
21
PHASE B Phase B of the stepping motor is connected between pin 20 and pin 21. See section 8.
SECTION 3
PIN ASSIGNMENT AND DESCRIPTION
PIN # PIN NAME PIN FUNCTION