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TMC4670 Datasheet PRELIMINARY • IC Version V0.99 | Document Revision V0.91 • 2016-Nov-09
Figure 10: Hall Sensor Angles
Hall Sensors give absolute positions within an electrical period with a resolution of 60
°
as 16 bit positions
(s16 resp. u16) PHI. With activated interim hall position interpolation one additionally gets high resolution
interim positions when the motor is running at speed beyond 60 rpm.
3.6.5 Digital Hall Sensor - Interim Position Interpolation
For lower torque ripple one can switch on the position interpolation of interim hall positions. This function
is useful for motors that are compatible with sine wave commutation but equipped with digital hall sensors.
When the position interpolation is switched on it becomes active on speed beyond 60 rpm. For lower
speed it automatically disables. This is important especially when the motor has to be at rest.
Motors that are intended for block commutation might smarter turn with hall signal interpolation but one
should not expect too much for those motors.
3.6.6 Digital Hall 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 and later the incermental encoder can be
used a a high resolution sensor for commutation.
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