Stepper Motor Driver IC For Optimal EMC Performance And Error Detection

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  • Programmable motor current for a precise current resolution
  • Integrated measurement and diagnostic
  • Energy consumption reduced by up to 90 per cent

Elmos, a developer and producer of automotive semiconductors, has launched the E523.39 automotive semiconductor chip. With this, the company presents a new high-precision stepper motor driver that meets the highest demands regarding smoothness, EMC emissions and error detection.

Precise resolution

With a supply voltage of 5V to 42V, the output stages of the E523.39 deliver a maximum current of either 400mA, 800mA or 1200mA. In each of the 3 modes, the programmable motor current achieves a precise current resolution of 8 bit.

A step resolution of up to 1/32 microstep, as well as multiple setting options such as 8 PWM frequencies, 7 decay modes or user-defined waveforms, enable the acoustic noise emissions in the application to be reduced to a minimum and EMC performance to be optimised. At the same time, the E523.39 only needs a minimum number of external components, which contribute to a cost-efficient BOM. Even with very small capacitances at the motor outputs, an ESD strength of over ±8kV (HBM) can be achieved.

No requirement of external MCUs

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Other excellent features of the E523.39 are the integrated measurement and diagnostic functions. For example, stall detection is performed internally without any requirement of external MCUs. The stall detection is reliable even at low speeds, challenging environmental conditions and different types of gears. This enables the application to work with very precise position information.

Ideal for safety

The E523.39 has a unique residual current detection mechanism, which detects even the smallest residual currents in the motor or wiring system. This enables many faults to be diagnosed before the drive and subsequently, the entire system fails to function. Thus, the device is an ideal component in safety-relevant applications.

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Reduced energy consumption

For applications where a holding current must be applied to the stopped motor, the E523.39 enables an “Adaptive Holding Torque”. The energy consumption for the holding current over the lifetime can thus be reduced by up to 90 per cent. The E523.39, therefore, offers a unique opportunity to reduce the CO2 emissions of the associated vehicle components in combination with innovative diagnostic functions.

Other target applications include headlight adjustment, HVAC flap control, cruise control, front grill adjustment or fluid valves. Furthermore, the module can also be used in industrial environments or for building automation.


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