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4 Functional Description
4.3 Motor with AES absolute encoder
Synchronous serial interface (SSI)
The synchronous serial interface (SSI) is used to read out the absolute angle positions of the encoder.
CLK
DATA
Res. (CS)
D0
CRC5 CRC4
Res.
Res.
D10
D11
CDS
Start
Data Range
Ack
Stop
Timeout
CRC0
After the encoder has sent the acknowledge (Ack), start and control bit (CDS) in the fixed cyclic start
sequence, the binary 12 bit sensor data is sent.
Two reserved and six CRC bits then follow.
If no other clock signals are sent to the CLK cable, the encoder runs in a timeout (16 µs), which ends
the communication. This is also optionally already possible after the 12 bit sensor data.
Angle position values rising in clockwise direction.
Clockwise rotation: Rotation of the output shaft in clockwise direction, viewed from the end of the
shaft on the output side of the motor.
