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The termination of each readout sequence by a timeout of CLK after the 22 clock pulse as described in Serial 2-Wire Connection (R/W Mode)
consecutive angle values without synchronization by simply continuing the CLK pulses without timeout after the 22 clock. The 23 clock is
equal to the 1 clock of the next measurement, etc.
serial data transmission by a timeout of CLK after a given number of readouts (e.g. synchronize after every 5 reading, etc.)
AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
7.5 Serial 2-Wire Continuous Readout
nd
is the safest method to ensure synchronization, as each timeout of CLK resets the serial interface.
However, it is not mandatory to apply a timeout of CLK and consequently synchronization after each reading. It is also possible to read several
nd rd
st
This is the fastest way to read multiple angle values, as there is no timeout period between the readings. It is still possible to synchronize the
th
Figure 10. Timing Diagram in 2-wire SSI Continuous Readout
command phase
data phase
command phase
CLK
1
2
3
4
5
6
7
8
22
23
24
25
DX
CS
t0
t1
DIO read
CMD4
CMD 3
CMD2
CMD 1
CMD 0
t5
CMD 4
CMD 3
CMD2
DIO write
t6
D 15
D 14
D0
1st reading
2nd reading
7.6 Serial 2-Wire Differential SSI Connection
With the addition of a RS-422 / RS-485 transceiver, a fully differential data transmission, according to the 21-bit SSI interface standard is
possible. To be compatible with this standard, the CLK signal must be inverted. This is done by reversing the Data+ and Data- lines of the
transceivers.
Note: This type of transmission is read-only.
Figure 11. 2-wire SSI Read-only Mode
+5 V
VDD
15
13
VDD
9
DX
C2
VDD
Micro
Controller
Output
CLK
D+
D-
D-
D+
11
10
CS
CLK
AS5030
100n
MAX 3081 or similar
VSS
Input DI
D+
D-
D+
D-
12
DIO
C1
VSS
VSS
14
3
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