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AS5134
Datasheet - D e t a i l e d D e s c r i p t i o n
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
+5V
VDD
VDD
Output
CS
VDD
VSS
Output
I/O
DCLK
DIO
C2
VSS
100nF
VSS
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).
t CLK
command phase
data phase
DCLK
1
2
3
4
5
6
7
20
21
CS
t1
t5
t9
DIO
DIO
CMD4
t3
t4
CMD3
CMD0
t6
t7
D15
t8
D14
D1
D0
t10
DIO read
DIO write
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
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