SPECIFICATIONS

Product introduction:

HR4988 is an easy-to-use micro-stepping motor driver with an integrated decoder. It is designed to enable bipolar stepping motors to work in full, half, 1/4, 1/8, and 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)

●Automatically detect and select current attenuation 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

●Overheating shutdown circuit

●Short circuit protection to ground

●Load short circuit protection

●Support up to 16 subdivisions

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, you need to set VR reference voltage on the bottom board

3. SLEEP, RESET, there are 10k pull-up resistors on the small 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