AS5304/AS5306 Integrated Hall IC for linear and off-axis rotary motion detection

Revision 1.5

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5 Functional Description

The AS5304/AS5306 require a multi-pole magnetic strip or ring with a pole length of 2mm (4mm pole pair length) on the

AS5304, and a pole length of 1.2mm (2.4mm pole pair length) on the AS5306. The magnetic field strength of the multi-pole

magnet should be in the range of 5 to 60mT at the chip surface.

The Hall elements on the AS5304/AS5306 are arranged in a linear array.

By moving the multi-pole magnet over the Hall array, a sinusoidal signal (SIN) is generated internally. With proper configuration

of the Hall elements, a second 90° phase shifted sinusoidal signal (COS) is obtained. Using an interpolation circuit, the length

of a pole pair is divided into 160 positions and further decoded into 40 quadrature pulses.

An Automatic Gain Control provides a large dynamic input range of the magnetic field.

An Analog output pin (AO) provides an analog voltage that changes with the strength of the magnetic field (see chapter 8).

Figure 3:

AS5304 / AS5306 block diagram

6 Sensor Placement in Package

TSSOP20 / 0.65mm pin pitch

0.2299±0.100

0.2341±0.100

0.7701±0.150

Package

Outline

3.0475±0.235

Die C/L

Figure 4:

Sensor in package

Die Tilt Tolerance ±1º