IC drives DC motors

The E910.71's ripple detection function enables the sensorless detection of the position of a DC motor-driven actuator by evaluating the current.

Elmos has released the E910.71, an IC designed for driving several DC motors, in particular actuators for climate flaps in automobiles.

The IC has a ripple detection function, which enables the sensorless detection of the position of a DC motor-driven actuator by evaluating the current.

This method represents a cost-effective solution for intelligently controlled DC motors.

The E910.71 contains six configurable half bridges, which can drive three DC motors at the same time or up to five motors sequentially.

Three autonomous pulse detectors convert the motor current into countable digital signals.

A microcontroller provides information on motor address, position and the pulse count command via an SPI to the circuit.

The addressed motor is then driven into the desired position and the measured number of motor revolutions is transmitted to the microcontroller.

A signal indicates that the desired motor position has been reached or that new diagnostic data is available.

Several ICs can be switched as a daisy chain in a cascade.

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