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AS5030

Datasheet - Detailed Descri p ti on

7.5 Serial 2-Wire Continuous Readout

The termination of each readout sequence by a timeout of CLK after the 22

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

consecutive angle values without synchronization by simply continuing the CLK pulses without timeout after the 22

equal to the 1

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

serial data transmission by a timeout of CLK after a given number of readouts (e.g. synchronize after every 5

Figure 10. Timing Diagram in 2-wire SSI Continuous Readout

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

CMD4

CLK

CS

DIO read

t0

t6

command phase

data phase

DIO write

t1

1

2

3

4

567

22

DX

8

CMD2

CMD3

CMD 1

CMD0

D15

D14

D0

t5

23

24

25

CMD 4

CMD2

CMD 3

1st reading

2nd reading

command phase

100n

CS

CLK

DI O

+5 V

VDD

VSS

VSS

C2

VDD

VDD

13

11

10

12

15

C1

VSS

3

14

Input

Output

DX

9

CLK

DI

D+

D-

D+

D-

MAX 3081 or similar

D+

D-

D-

D+

Micro

Controller

AS5030