Description:
 
This module is based on the original imported Toshiba stepper motor drive chip THB6128 design, can drive 57 and the following two-phase four-wire stepper motor.
 
The module has the following advantages：

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

module diagram is as follows:

 

Signal interface
 
The module has three sets of input signals, namely CP pulse signal, DIR direction signal, EN enable signal.
The electrical diagram of the signal is as follows: 

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:    

 

subdivision	1	2	3
1	ON	ON	ON
2	OFF	ON	ON
4	ON	OFF	ON
8	OFF	OFF	ON
16	ON	ON	OFF
32	OFF	ON	OFF
64	ON	OFF	OFF
128	OFF	OFF	OFF

Hybrid two-phase stepper motor step foot is generally 1.8 °, 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:

Current	1	2	3	4
2A	OFF	OFF	OFF	OFF
1.7A	OFF	OFF	OFF	ON
1.5A	OFF	OFF	ON	OFF
1.3A	OFF	OFF	ON	ON
1A	OFF	ON	ON	ON
0.7A	ON	ON	ON	ON

Current
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:

 

Package Included:

   1 X THB6128 Stepper Motor Driver Module