The TMC429 is a miniaturised low cost, high performance, stepper motor controller for up to three motors.

The TMC429 integrates all real time critical tasks in reliable, dedicated hardware incorporating an integrated motion ramp profile generator as well as an adaptable microstep sequencer with microstep RAM table. Advanced stop- and reference switch handling allows for precise and fast referencing as well as on-the-fly position checking. Automatic motor current control gives high motor dynamics while saving energy and the interrupt output can generate precise position pulses.

The TMC429 connects to the recent coolStep™ drivers (TMC260, TMC262 and TMC389) via Step- & Direction signals (S/D) or to the classic TRINAMIC drivers TMC236, TMC239, TMC246 and TMC249 via SPI™. The communication with the host microcontroller is performed with an extra SPI™ interface. The host just needs to do high-level control tasks, e.g. giving the command: Drive motor 2 to position 1000. The TMC429 automatically calculates the motion ramp based on velocity and acceleration parameters.

The main features then are: this is a miniaturised low cost 3 axes motor controller, it is high-performance micro stepper, has SPI™ host interface with easy-to-use protocol, step/direction or SPI™ driver interface and on-the-fly alteration of position set point, velocity and acceleration. In addition different types of SPI™ stepper motor driver chips may by mixed within a single daisy chain and communication on demand minimizes traffic to the SPI™ stepper motor drivers chain. It allows read-out of driver status information (current motion parameters eg. position, velocity, acceleration) and programmable 6 bit micro step table with up to 64 entries for a quarter sine wave period (SPI mode).

Micromech is the UK and Eire distributor for these amazing products and if you would like to find out more contact Stirling Morley on 01376 333333 or email

‘Affordable Automation’


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