AS5304 datasheet(11/31 Pages) AMSCO

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ams Datasheet

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[v2-00] 2017-May-03

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AS5304/AS5306 − Detailed Description

Figure 12:

Electrical Connection of the AS5304 / AS5306

Incremental Quadrature AB Output

The digital output is compatible to optical incremental encoder

outputs. Direction of rotation is encoded into two signals A and

B that are phase-shifted by 90º. Depending on the direction of

rotation, A leads B (CW) or B leads A (CCW).

Index Pulse

A single index pulse is generated once for every pole pair. One

pole pair is interpolated to 40 quadrature pulses (160 steps), so

one index pulse is generated after every 40 quadrature pulses

(see Figure 13).

The Index output is switched to Index = high, when a magnet

is placed over the Hall array as shown in Figure 14, top graph:

the north pole of the magnet is placed over the left side of the

IC (top view, pin#1 at bottom left) and the south pole is placed

over the right side of the IC.

The index output will switch back to Index = low, when the

magnet is moved by one LSB from position X=0 to X=X1, as

shown in Figure 14, bottom graph. One LSB is 25μm for AS5304

and 15μm for AS5306.

Note(s): Since the small step size of 1 LSB is hardly recognizable

in a correctly scaled graph it is shown as an exaggerated step

in the bottom graph of Figure 14.

VSS

VDDP

VDD

TEST

TEST_GND

INDEX

TEST

VDDA

ZPZ

Quadrature

Position A

Quadrature

Position B

No Connect

Index

VDD=5V

0.1uF

10uF

(optional)

No Connect

HOST

VDD=5V

10K

AS5304B,

AS5306B

ONLY!

AS5304A

AS5304B

AS5306A

AS5306B

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