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Revision 1.16

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AS5055

Datasheet - Detailed Descr i p ti on

Figure 4. Interrupt Chaining

7.2 SPI Communication

The transmitted data consists of 14-bit data, an Error-Flag and a Parity bit. When writing data to the chip, the Error-Flag is not applicable. The

Parity is generated from the upper 15 bits and forms an even parity over the whole frame. The Error-Flag indicates that a failure occurred in a

previous transmission.

7.2.1 Command Package

Every command sent to the AS5055 is represented with the following layout.

7.2.2 Read Package (Value Read from AS5055)

The read frame always contains two alarm bits, the error and parity flags and the addressed data of the previous read command.

Table 6. Command Package

Bit

MSB

14

13

12

11

10

9

8

7

6

5

4

3

2

1

LSB

RWn

Address <13:0>

PAR

Bit

Description

RWn

Indicates read or write command

Address

14-bit address code

PAR

Parity bit (EVEN)

Table 7. Read Package

Bit

MSB

14

13

12

11

10

9

8

7

6

5

4

3

2

1

LSB

Data <13:0>

EF

PAR

Bit

Description

Data

14-bit addressed data

EF

Error flag indicating a transmission error in a previous host

transmission

PAR

Parity bit (EVEN)

XINT

XENINT

=1

0

1

XINT

XENINT

0

1

AS5055 (Device A)

AS5055 (Device B)

Micro

controller

XINT

INT

mode

INT

mode

&

=1

&