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AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
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
+5 V
VDD
13
13
13
VDD
VDD
VDD
VDD
Micro
Controller
Output
Output
11
10
AS5030
#1
CS
CLK
DX
11
10
AS5030
#2
CS
CLK
DX
11
10
AS5030
(last device)
CS DX
CLK
100n
I/O
12
DI O
12
DI O
12
DIO
VSS
C1
C2 VSS
C1
C2 VSS
C1
C2 VSS
14
15
3
14
15
3
14
15
3
VSS
Figure 18. Timing Diagram in 3-wire Daisy Chain Mode
CLK
1
2
3
4
5
6
7
8
20
21
22
23
24
25
26
27
28
29
41
42
43
44
CS
DIO
CMD 4 CMD 3 CMD 2 CMD 1 CMD 0
D 15
D 14
D 13
D0
CMD 4 CMD 3 CMD 2 CMD 1 CMD 0
D 15
D 14
D 13
D0
CMD 4 CMD 3 CMD 2
www.ams.com/AS5030
AS5030 # 1
Revision 2.4
AS5030 # 2
AS5030 # 3
20 - 44
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