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Revision 2.4

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AS5030

Datasheet - Detailed Descri p ti on

7.10 3-Wire Daisy Chain Mode

The Daisy Chain mode allows connection of more than one AS5030 to the same controller interface. Independent of the number of connected

devices, the interface to the controller remains the same with only three signals: CSn, CLK and DO. In Daisy Chain mode, the data from the

second and subsequent devices is appended to the data of the first device.

The 100nF buffer cap at the supply (shown only for the last device) is recommended for all devices.

The total number of serial bits is: n*21, where n is the number of connected devices: e.g. for 2 devices, the serial bit stream is 42bits. For three

devices it is 63 bits.

Figure 17. Connection of Devices in 3-wire Daisy Chain Mode

Figure 18. Timing Diagram in 3-wire Daisy Chain Mode

#1

100n

CS

CLK

DIO

+5 V

VDD

VSS

VSS

C2

VDD

VDD

13

11

10

12

15

C1

VSS

3

14

I/O

Output

Output

DX

#2

CS

CLK

DIO

C2

VDD

13

11

10

12

15

C1

VSS

3

14

DX

(last device)

CS

CLK

DIO

C2

VDD

13

11

10

12

15

C1

VSS

3

14

DX

AS5030

AS5030

AS5030

Micro

Controller

CLK

CS

AS5030 #1

CMD 3

DIO

12

3

4

56

78

CMD1

CMD 2

CMD0

D15

D14

D13

CMD 4

CMD 3

20

21

22

23

24

25

26

CMD 1

CMD 2

CMD 0

D 15

D14

D 13

CMD4

27

28

29

D0

CMD 3

41

42

43

44

CMD2

CMD 4

D0

AS5030 #2

AS5030 #3