BTST2.5
Stepper Motor Driver
BTST2.5
Microstepping step/dir driver with stall detection for NEMA 11 to NEMA 23 motors
Hardware Overview & Motion Architecture
Stepper Motor Driver
BTST2.5 — Drive electronics
A compact, board-level microstepping driver for NEMA 11, 14, 17 and 23 stepper motors. The BTST2.5 accepts step and direction commands through optically isolated differential inputs and drives each motor phase at up to 2.5 A peak from a 24 V supply. Microstep resolution of up to 256 gives low-vibration, low-noise operation at both low and high speeds. Stall detection, auto-tuning and standstill current reduction are built in.
Key Performance Metrics
Engineering Features & Benefits
- •Up to 256 microsteps for smooth, precise motion
- •2.5 A peak maximum current per phase
- •Low vibration and noise at low and high speeds
- •Step/dir interface with stall detection
- •Optically isolated differential inputs and outputs
- •Auto-tuning to the connected motor
- •Configurable maximum run current and standstill current reduction
- •Soft start; operation begins 10 ms after startup
- •Protection: reverse polarity, thermal with auto retry, UVLO at 21 V
Hardware Connections & Signal Pinout
STEP±, DIR±, AWO±, MS±, STALL±, TIM± optically isolated differential pairs.
VIN (24 V DC nominal), GND power supply with built-in reverse polarity protection.
A+, A− (Phase A), B−, B+ (Phase B) for NEMA 11, 14, 17, and 23 stepper windings.
Typical OEM Applications & Environments
- — Positioning axes on OEM equipment
- — Laboratory instruments and automated handlers
- — Machine builders standardising one driver across a range
- — Semiconductor wafer handling and inspection systems
- — Medical diagnostic devices and automated packaging