AS5247 datasheet(19/37 Pages) AMSCO

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ams Datasheet: 2014-Jun-20 [v1-02]

AS5247 – 19

Detaile d Desc rip t ion

Figure 31:

RED(0x001A)

ABI Incremental Interface

The AS5247 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: clockwise (B leads, A follows) or

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

magnet and AS5247. The DIR bit can be used to invert the sense

of the rotation direction.

The IWIDTH setting programs the width of the index pulse

from3 LSB (default) to 1 LSB.

Figure 32:

ABI Signals at 11 Bit Resolution

Note: N = 2048 for 11-bit resolution, and N = 1024 for 10-bit resolution.

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

Clockwise rotation

Counter-clockwise rotation

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