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DM420 Two-phase digital stepper driver
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Overview
DM420, a two-phase stepper motor driver, is a cost-effective microstepping driver designed based on the Pl current control algorithm. It delivers excellent performance, featuring high-speed and high-torque output, low noise, low vibration, and low heat generation. The DM420 driver allows users to select operating current and microstepping settings via DIP switches, offering 16 microstepping options and 16 current levels. It includes protections against overvoltage, undervoltage, phase current overload, and total current overload. Both input and output control signals are optically isolated.Characteristic
• Pl control algorithm, featuring low noise, low vibration, and low heat generation.
• Signal Input: Single-ended, Pulse + Direction, and Dual Pulse; built-in microstepping.
• Power Supply: Supports up to DC 36V
• Current Setting: Conveniently adjustable with 16 selectable levels; peak output current up to 2.2A; current reduces by half after 1 second of motor inactivity.
• Factory default is up to 128 microsteps, adjustable up to 25,600 steps
• Optically isolated differential signal input, input pulse frequency up to 300KHz.Adapts to 20, 28, 35, 39, and 42-sized 4, 6, and 8-wire two-phase stepper motors.
• Over-voltage, under-voltage alarm, phase current over-current protection, motor phase open circuit detection and other functions.
• Pulse, direction and enable terminals have constant current input function, can be directly connected to the input signal.
• It can be directly connected to the input signal without the need of external series current limiting protection.
• High reliability: Multi-layer board and surface mounting sealing are adopted to leave enough margin for power devices.Performance indicators
Electrical indicators
Describe DM420 Min. values Typical values Max.values Unit Output Current (Peak) 0.2 - 2.2 A Supply Voltage 8 24 36 VDC Control Signal Current 6 10 16 mA Step Pulse Frequency 0 - 300 KHz Step Pulse Width 2 - - us Direction Signal Width 100 - - us Undervoltage Protection Point - 7.5 - VDC Overvoltage Protection Point - 42 - VDC Driver Initialization Time 2 - - s Insulation Resistance 500 MΩ Environmental indicators
Cooling method Natural or forced air cooling Operating environment Occasions for use Can not be placed next to other heat-generating equipment, to avoid dust, oil, corrosive gases, too much humidity and strong vibration places, prohibit combustible gases and conductive dust; Temp 0-+50℃ Humidity 40-90%RH Vibration 10~55Hz/0.15mm Storage temperature -20℃~65℃ Weight 180g 
Control signal wiring instructions
Function Symbolic Mean Note Pulse Signal PUL+ Start/stop signal positive Default pulse is valid on the falling edge; pulse width should be greater than 1.2μs for reliable esponse to pulse signals Input voltage range: 3.3~28V. PUL- Start/stop signal negative Direction Signal DIR+ Direction signal positive The motor's rotation direction depends on the DIR signal. When the DIR signal is floating or at a low level, the motor rotates clockwise; when the DIR signal is high, the motor rotates counterclockwise. To ensure reliable motor direction switching, the direction signal should be established at least 5μs before the pulse signal. The motor's initial running direction is related to the motor winding connections; swapping any winding pair (such as A+and A-) can change the motor's initial running direction.Input voltage range:3.3V~28V. DIR- Direction signal negative Enable Signal EN+ Enable signal positive Enable control signal: This input signal is used to enable or disable the driver output.When ENA is at a low level (or the internal optocoupler is conducting), the driver cuts off the current to all motor phases, putting the motor in a free state and ignoring step pulses.If this function is not needed, simply leave the enable signal terminal floating.Input voltage range: 3.3~28V. EN- Enable Signal Negative Wiring instructions for power supply and motor
Function Symbolic Mean Note Power Input V+ DC Power Supply Positive DC Power:18VDC-36VDC V- DC Power Supply Negative Motor Wiring A+ Stepper Motor Phase A Winding Swapping either the A+and A-winding connections or the B+ and B-winding connections can change the motor's initial running direction. A- B+ Stepper Motor Phase B Winding B- Current and microstepping configuration
An 8-bit DIP switch is used to set the subdivision, operating current, pulse mode selection, and self-running mode.
Detailed descriptions are as follows:(The locked rotor holding current can be internally jumper-set to full current, with a default of 50%.)
Current Settings SW1 SW2 SW3 SW4 Subdivision Settings SW5 SW6 SW7 SW8 Continuous Self-Runnings Filtering Times SW9 SW10 SW11 SW12 Single/Dual Pulse Self-Running Current Settings
Current(peak) RMS Current SW1 SW2 SW3 0.3A 0.2A ON ON ON 0.5A 0.3A OFF ON ON 0.7A 0.5A ON OFF ON 1.0A 0.7A OFF OFF ON 1.3A 0.9A ON ON OFF 1.6A 1.1A OFF ON OFF 1.9A 1.3A ON OFF OFF 2.2A 1.5A OFF OFF OFF Subdivision settings
Speed
(RPM)SW5 SW6 SW7 SW8 r/min 400 ON ON ON ON 5 800 OFF ON ON ON 10 1600 ON OFF ON ON 15 3200 OFF OFF ON ON 30 6400 ON ON OFF ON 60 12800 OFF ON OFF ON 90 5600 ON OFF OFF ON 120 51200 OFF OFF OFF ON 150 1000 ON ON ON OFF 180 2000 OFF ON ON OFF 210 4000 ON OFF ON OFF 240 5000 OFF OFF ON OFF 300 8000 ON ON OFF OFF 400 10000 OFF ON OFF OFF 500 20000 ON OFF OFF OFF 650 40000 OFF OFF OFF OFF 800 Other parameter settings
Operating mode SW9 SW10 Pulse+Direction (PUL+DIR) OFF OFF Dual Pulse (CW/CCW) ON OFF I/O Speed Mode OFF ON Self-Test Mode ON ON Speed Filtering and Smoothing Settings
Filtering time SW11 SW12 Default OFF OFF 4ms ON OFF 12ms OFF ON 32ms ON ON Driver status LED indicator
LED codes ERROR ● Green light always on Motor running ●● Green light flashing Motor stopped ●● One red, one green Driver overcurrent ●●● Two red and one green Motor winding open circuit ●●●● Three red and one green Driver input overvoltage ●●●●● Four red and one green Driver input undervoltage ●●●●●● Five red and one green Others
DM420 Two-phase digital stepper driver
Still deciding? Get samples first, Contact US !
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