AS5047U-HTST datasheet(30/51 Pages) AMSCO

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[v1-00] 2018-Oct-30

AS5047U − Detailed Description

ABI Incremental Interface

The AS5047U 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 a 12-bit

resolution 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). During

the start-up time, after power on to the chip, all three ABI signals

are high. 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 49:

ABI Signals

N= 16384 for 14-Bit resolution, N = 4096 for 12-bit resolution

and N = 1024 for 10-bit resolution..

The Figure 49 shows the ABI signal flow if the magnet rotates

in clockwise direction and counter-clockwise direction (DIR=0).

The rotation direction of the magnet is defined as clockwise

(DIR=0) when the view is from the topside of AS5047U.

012345678

N-1

N-2

N-3

N-4

N-5

N-6

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

N-7

Steps

Clockwise rotation

Counter-clockwise rotation

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