HR4988 is an easy-to-use micro-stepping motor driver with integrated decoder. It is designed to enable bipolar stepping motors to work in full, half, 1/4, 1/8, 1/16 stepping modes. The step mode is selected by the logic input MSx. The output drive capacity reaches 38V and ±2A. HR4988 contains a fixed decay time current regulator that works in slow decay or mixed decay mode.

Features:

• Low on-resistance RDS(ON)
  
• Automatic detection and selection of current decay mode
  
• Support slow decay and mixed decay modes
  
• Synchronous rectification function to reduce power consumption
  
• Internal undervoltage lockout
  
• Overcurrent protection
  
• Compatible with 3.3V and 5V logic levels
  
• Thermal shutdown circuit
  
• Short circuit protection to ground
  
• Load short circuit protection
  
• Support up to 16 segments

Instructions for use:

1. The pin headers are installed on the same side as the chip, so the definition of the motherboard header pin sequence is required;
2. MS3 pin header definition, replace with VR, need to set VR reference voltage on the bottom board
3. SLEEP, RESET, 10k pull-up resistors on the board
4. The upper limit current resistance of the small plate is 0.27 ohms, and the current calculation formula is I=VR/(8*0.27)
5. The heat sink can be attached to the exposed copper on the front
6. VBB voltage: 8~38V.
7. VDD voltage: 3~5.5V.
8. Iout output maximum current: 2A
9.Maximum power consumption of the module: 8mA
10. Logic input pin level: 0~5V
11. VR pin level: 0.5~4V