DESCRIPTION
   The TMC429 is a miniaturized stepper motor controller with an industry leading feature set. It controls up to three motors via SPI or Step/Direction interface. The SPI interface provides a programmable 6 bit microstep table (64 µsteps / fullstep) for best step accuracy with 2-phase stepper motors. Based on target positions and velocities - which can be altered on the fly - it performs all real time critical tasks autonomously. The TMC429 offers high level control functions for robust and reliable operation. Two separate 4 wire serial peripheral interfaces allow for communication with the microcontroller and with up to three daisy chained stepper motor drivers.

FEATURES AND BENEFITS
   Controls up to three stepper motors
   3.3 V or 5 V operation with CMOS / TTL compatible IOs
   Serial 4-wire interface for µC with easy-to-use protocol
   Interface for SPI™ motor drivers with data rates up to 1 Mbit/s
   Step/Direction interface
   Clock frequency: up to 32 MHz (can use CPU clock)
   Internal position counters 24 bit wide
   Microstep frequency up to 1 MHz
   Read-out option for all motion parameters
   Programmable 6 bit microstep table, up to 64 entries for a
   quarter sine wave period
   Ramp generators for autonomous positioning / speed control
   On-the-fly change of target motion parameters
   Power boost automatic acceleration dependent current control
   Low power operation: 1.25 mA at 4 MHz (typ.)
   Compact Size: ultra small 16 pin SSOP package, small 24 pin SOP
   package, and 32 pin QFN 5x5 mm package
   Directly controls TMC23x, TMC24x, TMC26x, and TMC389