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AS5134

Datasheet - Detailed Descr i pti on

7.2 Serial 3-Wire R/W Connection

In this mode, the AS5134 is connected to the external controller via three signals: Chip Select (CS), Clock (DCLK) inputs and bi-directional DIO

(Data In/Out) output. The controller sends commands over the DIO pin at the beginning of each data transmission sequence, such as reading

the angle or putting the AS5134 in and out of the reduced power modes.

Figure 4. SSI Read/Write Serial Data Transmission

A pull-down resistor (as shown in Figure 5) is not required. C2 is a hardware configuration input. C2 selects 3-wire mode (C2 = low) or 2-wire

mode (C2 = high).

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

+5V

VDD

VDD

CS

DCLK

DIO

VSS

VSS

C2

100nF

VSS

VDD

I/O

Output

Output

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