Datasheet

TMC4671 Datasheet • IC Version V1.3 | Document Revision V2.00 • 2020-Apr-17

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4.6.7 Digital Hall Sensors together with Incremental Encoder

If a motor is equipped with both Hall sensors and incremental encoder, the Hall sensors can be used for

the initialization as a low resolution absolute position sensor. Later on, the incremental encoder can be

used as a high resolution sensor for commutation.

4.6.8 Analog Hall and Analog Encoder Interface (SinCos of 0° 90° or 0° 120° 240°)

An analog encoder interface is part of the decoder engine. It is able to handle analog position signals of 0

and 90° and of 0° 120° 240°. The analog decoder engine adds oﬀsets and scales the raw analog encoder

signals, while also calculating the electrical angle PHI_E from these analog position signals by an ATAN2

algorithm.

SIN/COS Hall

Track SIN

Track COS

3-phase Analog Hall

Track 0°

Track 120°

Track 240°

SIN/COS with 10 PPR

Track SIN

Track COS

Figure 27: Analog Encoder (AENC) signal waveforms

An individual signed oﬀset is added to each associated raw ADC channel and scaled by its associated

scaling factors according to

AENC_VALUE = (AENC_RAW + AENC_OFFSET) · AENC_SCALE (26)

In addition, the AENC_OFFSET is for conversion of unsigned ADC values into signed ADC values as required

for the FOC.

Info

The control bit that selects either processing of analog position signals of 0

and

90° or analog signals of 0° 120° 240° must be set.

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