AS5030_1 AMSCO [austriamicrosystems AG], AS5030_1 Datasheet - Page 14

• Manufacturer Part Number: AS5030_1
• Description: 8 BIT PROGRAMMABLE HIGH SPEED MAGNETIC ROTARY ENCODER
• Manufacturer: AMSCO [austriamicrosystems AG]

AS5030 8-bit Programmable Magnetic Rotary Encoder
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.
Figure 17: Connection of devices in 3-wire Daisy Chain mode
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).
Rev. 1.8
VSS
VSS
VDD
+5V
VDD
+5V
CLK
DIO
CS
Micro
Controller
Micro
Controller
VDD
VSS
VDD
VSS
CMD4
Output
Output
Output
I/O
1
I/O
CMD3
2
CMD2
11
10
12
3
14
11
10
12
DIO
CS
CLK
C1
CMD1
14
13
AS5030
CS
DIO
15
4
CLK
C1
VDD
AS5030 #1
C2
#1
CMD0
13
AS5030
15
VDD
C2
VSS
5
3
#1
DX
D15
VSS
3
6
DX
D14
7
11
10
12
14
D13
DIO
CS
CLK
C1
www.austriamicrosystems.com
8
12
11
10
13
AS5030
15
VDD
14
C2
#2
CS
CLK
DIO
C1
20
13
AS5030
VSS
3
15
DX
VDD
C2
#2
D0
21
VSS
3
CMD4
DX
22
CMD3
11
10
12
14
23
DIO
CS
CLK
C1
(last device)
CMD2
12
13
11
10
AS5030
15
VDD
24
14
C2
13
CS
CLK
DIO
C1
CMD1
VDD
(last device)
VSS
3
AS5030
25
DX
AS5030 #2
CMD0
15
26
C2
VSS
3
100n
DX
D15
27
100n
D14
28
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.
D13
29
41
D0
42
CMD4
AS5030 #3
43
CMD3
44
Page 14 of 33
CMD2