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Revision 1.6

11 - 29

AS5134

Data Sheet - D e ta i l e d D e s c r i p t i o n

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 DCLK signal must be inverted. This is done by

reversing the Data+ and Data- lines of the transceiver.

Note: This type of transmission is read-only.

Figure 6. 2-Wire SSI Read-only Mode

1

2

3

4

5

67

D15

D14

D1

D0

DCLK

DIO

CS

DIO

command phase

data phase

t1

DIO read

DIO write

8

DX

CMD4

CMD3

CMD2

CMD1

CMD0

22

timeout phase

t0

t5

t6

+5V

VDD

VDD

DCLK

DIO

VSS

VSS

C2

100n

VSS

VDD

Input

Output

DCLK

DI

D+

D-

D+

D-

D-

D-

D+

D+

MAX 3081 or similar