I²C Motor Driver Reduces Complexity of Positioning Applications

The AMIS-30624 is a single-chip micro-stepping motor driver with a position controller and an integrated control/diagnostic interface.

ON Semiconductor’s AMIS-30624 is equipped to build intelligent peripheral systems where up to 32 drivers can be connected to one I²C master. This significantly reduces the system complexity of positioning applications that use multiple axes, or that require mechatronic solutions with the driver-chip mounted directly on the motor.

The AMIS-30624 is also fully compatible with the automotive voltage requirements, as it is implemented in I2T100 technology, enabling high-voltage analogue circuitry and digital functionality on the same chip.

The chip receives positioning instructions through the bus and subsequently drives the stator coils so the two-phase stepper-motor moves to the desired position. The on-chip position controller can be configured for different motor types, positioning ranges and parameters. Micro-stepping allows for silent motor operation and increased positioning resolution.

The AMIS-30624 can easily be connected to an I²C bus where the I²C master can fetch specific status information such as position and error flags from each individual slave node. An advanced motion qualification mode enables verification of the complete mechanical system according to the selected motion parameters. Integrated sensorless stall detection stops the motor when running into stall. This enables silent and accurate position calibrations during a referencing run and semi-closed-loop operation when approaching the mechanical end-stops.

 

FEATURES Micro-stepping technology Sensorless stall detection Peak current up to 800mA Fixed-frequency PWM current control Selectable PWM frequency Automatic selection of fast and slow decay mode No external fly-back diodes required 14V and 24V compliant Motion qualification mode

APPLICATIONS Small positioning applications Industrial equipment Building automation Automotive applications: Headlamp alignment Idle control Cruise control Air conditioning

 

 

ON Semiconductor / AMIS-30624