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Stepper Motor Driver Board Dual Bridge MOSFET Driving Controller Module for Arduino/Smart Car

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Product Introduction:
1.Chip using double full-bridge MOSFET driver, low on-resistance Ron = 0.55 ohm
2.Maximum voltage 36V, peak current 2.2A, continuous current 2A, the current set by DIP switch simple set
3.1, 2, 4, 8, 16,32,64,128 a variety of sub-optional, subdivided through the DIP switch to set
4.Chip with automatic half-flow lock function, greatly reduce the heat when the motor is locked
5.Chip built-in temperature protection, over-current protection
6.Built-in 5V logic signal supply regulator chip, and add a current limiting resistor to reduce the chip fever when the input high voltage
7.Input voltage side reverse polarity protection
8.Reasonable alignment, clear identification, reliable and stable

Signal interface:
The module has three sets of input signals, namely CP pulse signal, DIR direction signal, EN enable signal.

When the external signal amplitude is 3.3-5V, the current limiting resistor R can not be connected,
when the signal amplitude exceeds 5V, the input signal must be limited to ensure that the optocoupler input current of 8mA-15mA,
the specific calculation method For: optocoupler conduction voltage drop is generally 1.1-1.3V or so, take 1.2V,
then Optocoupler current = (voltage amplitude - optocoupler conduction voltage drop 1.2V)/(R + 330)
Special Note: If the optocoupler operating current exceeds 20mA, the optocoupler life will be greatly reduced.
The input signal interface is characterized by: the user can be used as needed common anode connection or common cathode connection.
  1.Common anode connection: respectively CP +, DIR +, EN + connected to the control system power supply.
    The signal is input from the CP-, DIR-, EN- side and works at low level.
  2.The common cathode connection: CP-, DIR-, EN-, respectively, connected to the control system to the ground (SGND, isolated from the power supply),
   the signal from the CP +, DIR +, EN + side input, and play a role in the high level.

Subdivision settings:
The subdivision is set by the DIP switch S2, the specific correspondence table is as follows:

Hybrid two-phase stepper motor step foot is generally 1.8 degree, that is, single-step 360 / 1.8 = 200 steps, the number of single-turn pulse is 200 * n, n for the breakdown.
For example, using 16 subdivision, the number of single-turn pulses should be 200 * 16 = 3200, that is, from the CP input 3200 pulses, stepping motor turn a full circle.

Current setting:
This module uses the resistor divider way, to the chip VREF feet to provide the reference voltage, and through the DIP switch S1 to select the resistance. Defined as follows:

The table lists the common current corresponding to the block code switch combination, the rest of the combination of ways to achieve other phase current settings.
This can be calculated by measuring the voltage at the test point Vref. The formula is:
When the motor is running,Motor phase current = Vref * 2
When the motor is locked, due to half-flow lock reasons, Vref is also automatically halved,Motor phase current = Vref * 4

Current attenuation mode:

The module uses two 4.7K resistors, the VFDT pin voltage is set to 2.5V, that is, mixed attenuation mode, is the most commonly used mode.
In this mode, the motor high-speed or low-speed operation will be normal. If you need other attenuation mode, please adjust the voltage divider.
The FDT voltage and attenuation modes given in the chip manual are as follows:

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Stepper Motor Driver Board Dual Bridge MOSFET Driving Controller Module for Arduino/Smart Car