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AS5134

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

Serial 3-Wire Read-only Connection

This simplified connection is possible when the AS5134 is only used to provide the angular data (no power down or

OTP access). The Chip Select (CS) and Clock (DCLK) connection is the same as in the R/W mode, but only a digital

input pin (not an I/O pin) is required for the DIO connection. As the first 5 bits of the data transmission are command

bits sent to the AS5134, both the microcontroller and the AS5134 are configured as digital inputs during this phase.

Therefore, a pull-down resistor must be added to make sure that the AS5134 reads “00000” as the first 5 bits, which

sets the Read_Angle command.

Note: All further application examples are shown in R/W mode, however read-only mode is also possible unless

otherwise noted.

Figure 4. SSI Read-only Serial Data Transmission

Table 5. Serial Bit Sequence (16bit read/write)

Write Command

Read/Write Data

C4 C3 C2

C1

C0 D15 D14 D13 D12 D11 D10 D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

CMD0

CMD4

CMD3

1

2

3

4

56

7

21

20

D15

D14

D1

D0

DCLK

DIO

CS

DIO

command phase

data phase

t1

t9

t5

t3

t4

t6

t7

t8

t10

DIO read

DIO write

+5V

VDD

VDD

CS

DCLK

DIO

VSS

VSS

C2

100n

VSS

VDD

Input

Output

Output

10k…

100k