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DM422 — 2-Phase Digital Stepper Driver
The DM422 is a two-phase digital stepper driver built around servo-like control principles, combining vector control, built-in microstepping, and adaptive filtering to smooth out motor performance across low, medium, and high speeds while keeping noise down. Its pure sine-wave current vector control reduces motor heating, and its operating range — DC20–40V input, up to 2.2A peak current — is sized for 42mm-frame two-phase hybrid stepper motors.
Features
32-bit DSP control technology
Compact, easy-to-mount enclosure
Drives 4-, 6-, or 8-wire two-phase stepper motors
Opto-isolated differential signal inputs
Built-in microstepping
Pulse response frequency up to 200 kHz (higher available on request)
Precision current control significantly reduces motor heating
Low vibration, low noise
Automatic idle-current reduction when stationary
Overvoltage, undervoltage, and open-phase protection
Electrical Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Output Current | 0.3 | — | 2.2 | A |
| Input Supply Voltage | 20 | 24 | 40 | VDC |
| Control Signal Input Current | 7 | 10 | 16 | mA |
| Step Pulse Frequency | 0 | — | 200 | kHz |
| Insulation Resistance | 50 | — | — | MΩ |
Environmental Specifications
| Parameter | Value |
|---|---|
| Cooling | Natural convection or fan-assisted |
| Operating Temperature | 0°C to 50°C |
| Storage Temperature | -20°C to 65°C |
| Humidity | 40–90% RH |
| Vibration | 10–55 Hz / 0.15 mm |
| Installation Environment | Keep away from other heat-generating equipment; avoid dust, oil mist, corrosive gas, high humidity, strong vibration; no flammable gas or conductive dust |
Control Signal Interface
| Pin | Function |
|---|---|
| PUL+ / PUL- | Pulse input. Drivable at +5V to +24V, active on rising edge — the motor advances one microstep on each falling edge of the pulse. Pulse width should exceed 2μs for reliable response. |
| DIR+ / DIR- | Direction input. Drivable at +5V to +24V, high/low level signal. The direction signal should be established at least 5μs before the pulse signal to guarantee reliable direction changes. Initial rotation direction depends on motor wiring; swapping either phase winding (e.g., A+/A-) reverses it. |
| MF+ / MF- | Enable input. Drivable at +5V to +24V, high/low level signal. Pulling MF+ to +5V and MF- low cuts current to all motor phases, putting the motor in a free (unpowered) state and ignoring step pulses. Leave the enable input floating when this function isn't needed. |
Power Interface
| Pin | Function |
|---|---|
| V- | DC power ground |
| V+ | Power supply positive, DC20–40V range, +24V recommended |
| A+ / A- | Motor phase A winding |
| B+ / B- | Motor phase B winding |
Status Indicators
A green LED indicates power status — lit continuously when the driver is powered, off when power is cut. A red LED indicates faults, blinking in a repeating 3-second cycle when a fault is active and going dark once the fault clears. The number of blinks within each 3-second cycle identifies the fault:
| Blink Count | Fault |
|---|---|
| 2 | Overvoltage (voltage > DC40V) |
| 3 | Undervoltage (voltage < DC20V) |
| 5 | Motor open circuit (phase loss) |
Both common-cathode and common-anode control signal wiring configurations are supported.
Typical Applications
Sized for 42mm two-phase hybrid stepper motors up to 2.2A peak current, the DM422 fits desktop CNC and 3D printer axes, small automation equipment, labeling and packaging machinery, and other pulse/direction-controlled positioning tasks where smooth, low-noise operation and reduced motor heating matter.
Why Choose the DM422
The 32-bit DSP core with vector control and pure sine-wave current drive keeps the motor running smoothly across its full speed range while cutting the heat buildup that plain constant-current drivers produce, and built-in microstepping and adaptive filtering reduce resonance-related noise and vibration without external tuning. Opto-isolated differential inputs protect the control electronics from motor-side noise, and automatic idle-current reduction cuts motor heating and power draw whenever the axis is stationary. Built-in overvoltage, undervoltage, and open-phase protection, paired with LED fault diagnostics, shortens troubleshooting time in the field.
We can customize the driver's electrical parameters and mechanical configuration according to customer requirements. For more product information, please visit our company website.
