Integrated Hall ICs for Linear and
Off-Axis Rotary Motion Detection
The AS5304/AS5306 are single-chip ICs with integrated Hall
elements for measuring linear or rotary motion using
multi-pole magnetic strips or rings. This allows the usage of the
AS5304/AS5306 in applications where the Sensor IC cannot be
mounted at the end of a rotating device (e.g. at hollow shafts).
Instead, the AS5304/AS5306 are mounted off-axis underneath
a multi-pole magnetized ring or strip and provides a quadrature
incremental output with 40 pulses per pole period at speeds of
up to 20 meters/second (AS5304) or 12 meters/second
A single index pulse is generated once for every pole pair at the
Index output. Using, for example, a 32pole-pair magnetic ring,
the AS5304/AS5306 can provide a resolution of 1280
pulses/revolution, which is equivalent to 5120
positions/revolution or 12.3bit. The maximum speed at this
configuration is 9375 rpm.
The pole pair length is 4mm (2mm north pole / 2mm south pole)
for the AS5304, and 2.4mm (1.2mm north pole / 1.2mm south
pole) for the AS5306. The chip accepts a magnetic field strength
down to 5mT (peak). Both chips are available with
open drain outputs (AS530xB).
The AS5304/AS5306 are available in a small 20-pin TSSOP
package and specified for an operating ambient temperature
of -40°C to 125°C.
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