AS5030 8-bit Programmable Magnetic Rotary Encoder

Rev. 1.8

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Page 14 of 33

4.21 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

CLK

CS

AS5030 #1

CMD3

DIO

12

3

4

56

78

CMD1

CMD2

CMD0 D15

D14

D13

CMD4

CMD3

20

21

22

23

24

25

26

CMD1

CMD2

CMD0 D15

D14

D13

CMD4

27

28

29

D0

CMD3

41

42

43

44

CMD2

CMD4

D0

AS5030 #2

AS5030 #3

Figure 18: Timing diagram in 3-wire Daisy Chain mode

4.22 2-Wire Daisy Chain Mode

Figure 19: 2-wire Daisy Chain mode

The AS5030 can also be connected in 2-wire Daisy Chain mode, requiring only two signals (Clock and Data) for any given

number of daisy-chained devices. Note that the connection of all devices except the last device is the same as for the 3-wire

connection (see Figure 17). The last device must have pin C2 (#15) set to high and feeds the DX signal to CS of the first device.

Again, each device should be buffered with a 100nF cap (shown only for the last device).

AS5030

#1

Micro

Controller

100n

CS

CLK

DIO

+5V

VDD

VSS

VSS

C2

VDD

VDD

13

11

10

12

15

C1

VSS

3

14

I/O

Output

Output

DX

AS5030

#2

CS

CLK

DIO

C2

VDD

13

11

10

12

15

C1

VSS

3

14

DX

AS5030

(last device)

CS

CLK

DIO

C2

VDD

13

11

10

12

15

C1

VSS

3

14

DX

AS5030

#1

Micro

Controller

100n

CS

CLK

DIO

+5V

VDD

VSS

VSS

C2

VDD

VDD

13

11

10

12

15

C1

VSS

3

14

I/O

Output

DX

AS5030

#2

CS

CLK

DIO

C2

VDD

13

11

10

12

15

C1

VSS

3

14

DX

AS5030

(last device)

CS

CLK

DIO

C2

VDD

13

11

10

12

15

C1

VSS

3

14

DX