AS5147P datasheet(21/40 Pages) AMSCO

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[v1-01] 2015-May-12

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AS5147P − Detailed Description

ABI Incremental Interface

The AS5147P can send the angle position to the host

microcontroller through an incremental interface. This

interface is available simultaneously with the other interfaces.

By default, the incremental interface is set to work at the highest

resolution (12 bits), which corresponds to 4096 steps per

revolution or 1024 pulses per revolution (ppr). This resolution

can be changed with the OTP bits ABIRES.

The phase shift between the A and B signals indicates the

rotation direction: clockwise (A leads, B follows) or

counterclockwise (B leads, A follows) as viewed from above the

magnet and AS5147P. The DIR bit can be used to invert the sense

of the rotation direction.

The IWIDTH setting programs the width of the index pulse from

3 LSB (default) to 1 LSB.

Figure 32:

ABI Signals at 11-Bit Resolution

N =4096 for 12-Bit resolution, and N = 1024 for 10-bit

resolution.

The Figure 32 shows the ABI signal flow if the magnet rotates

in clockwise direction, placing the magnet on the top of the

AS5147P and looking at the magnet from the top (DIR=0). With

the bit DIR, it is possible to invert the rotation direction.

N-1

N-2

N-3

N-4

N-5

N-6

N-1 N-2 N-3 N-4

N-7

Steps

Clockwise rotation

Counter-clockwise rotation

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