AS5147 datasheet(18/35 Pages) AMSCO

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AS5147 – 18

ams Datasheet: 2014-Jun-27 [v1-04]

De tail ed De sc rip t ion

Figure 31:

RED (0x001A)

ABI Incremental Interface

The AS5147 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 (11 bits), which corresponds to 2048 steps per

revolution or 512 pulses per revolution (ppr). This resolution

can be cut in half using the OTP bit ABIRES, which results in 1024

steps per revolution or 256 pulses per revolution.

The phase shift between the A and B signals indicates the

rotation direction: e.g. DIR-Bit = 0, clockwise (B leads, A follows)

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

the magnet and AS5147. 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 = 2048 for 11-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

AS5147 and looking at the magnet from the top (DIR=1).. With

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

Name

Read/Write/

Program

Bit

Position

Description

REDUNDANCY

R/W/P

4:0

Redundancy bits. This field enables with force to high one

bit of the Non-Volatile register map after a non-successful

burning. For more details please refer to the application note

“AN5000 – AS5147_Redundancy_Bits”

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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