Long unshielded wires from MCU to driver pins act as antennas. Fix: Add 10kΩ pull-down resistors near the driver’s input pins and use twisted pair wiring.
Likely overcurrent damage to that specific H-bridge (shorted motor, stall current > 3.5A). Fix: Replace the IC. For future designs, add a fast-blow fuse per channel (3A rating). Pi40952 3x2b Driver
Found in multi-I/O configurations (Serial + Parallel combo cards). Technical Specifications Interface: PCI Express x1, V1.1. Long unshielded wires from MCU to driver pins
Missing common ground between motor power supply and MCU ground. Fix: Connect GND of the Pi40952 to GND of the power supply AND GND of the microcontroller. stall current >