Stepper drivers self-tune motor parameters for life

There is no need to manually tune stepper motor drives, claimed Texas Instruments, as it introduced two 24V stepper motor driver chips with its patented ‘AutoTune’ technology.

TI microstepper

“AutoTune technology on the DRV8880 and DRV8881 eliminates the iterative process of manual tuning,” said TI. “On-chip intelligence dynamically monitors the motor’s performance under varied conditions over its life-time and adjusts decay settings appropriately.” – Despite changes in motor properties, supply voltage, load and torque.

For motor systems that do not require auto-tuning, DRV8885 has also been introduced. It has “technology that eliminates two external sense resistors to regulate the current to the motor”, said the firm.

TI microstepper diagPackaging is 28pin WQFN and HTSSOP for DRV8880 and DRV8881, and 24-pin HTSSOP for DRV8885. Soon will come the 24pin HTSSOP DRV8884 is available now in a  package.

Evaluations kits are available: DRV8880EVM, DRV8881EEVM (for phase/enable interface), DRV8881PEVM (for PWM interface) and DRV8885EVM. Each has an onboard MSP430 microcontroller.

Applications are expected in 3D printers, robotics, factory automation equipment and currency-counting machines.

Device Feature Control interface Current capacity On-chip micro-stepping
DRV8880 AutoTune Step/Direction 2.0A full scale
(max drive current)
Up to 1/16.
DRV8881 AutoTune Phase/enable 2.0A full scale
(max drive current)
No; external control allows
higher micro-stepping levels.
DRV8885 Integrated
current sensing
Step/Direction 1.5A full scale
(max drive current)
Up to 1/16.

DRV8884 Integrated
current sensing
Step/Direction 1A full scale
(max drive current)
Up to 1/16.

 

 


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