AS5161

Datasheet - Application In form atio n

www.ams.com

Revision 1.1

18 - 35

Each communication starts with the reception of a request from the external controller. The request consists of two frames: one synchronization

frame and the command frame.

The synchronization frame contains the data 0x55 and allows the UART to measure the external controller baud rate:

Figure 13. Synchronization Frame

The second frame contains the command Read/ Write (1 bit) and the address (7 bits):

Figure 14. Address and Command Frame

Only two commands are possible. In case of read command the idle phase between the command and the answer is the time TSW. In case of

parity error command is not executed.

Notes:

1. In case of Write command the request is followed by the frames containing the data to write.

2. In case of Read command the communication direction will change and the AS5161 will answer with the frames containing the

requested data.

Table 13. Possible Commands

Possible Interface

Commands

Description

AS5X63

Communication Mode

Command

CMD

WRITE

Write data to the OTP memory or Registers

SLAVE

0

READ

Read data to the OTP memory or Registers

SLAVE & MASTER

1

start

stop

D0

D1

D2

D3

D4

D5

D6

D7 par

AD

3

AD

4

AD

5

AD

6

R/Wn par

start

stop

AD

0

AD

1

AD

2