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AS5030
Datasheet - D e t a i l e d D e s c r i p t i o n
7.3 Serial 3-Wire Read-only Connection
If the AS5030 is only used to provide the angular data (no power down or OTP access) this simplified connection is possible. The Chip Select
(CS) and Clock (CLK) 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 AS5030, both the microcontroller and the AS5030 are configured as
digital inputs during this phase. Therefore, a pull-down resistor must be added to make sure that the AS5030 reads “00000” as the first 5 bits
which sets the Read_Angle command.
All further application examples are shown in R/W mode, however read-only mode is also possible, unless otherwise noted.
Figure 6. SSI Read-only Serial Data Transmission
+5 V
VDD
13
VDD
VDD
Output
11
CS
Micro
Controller
VSS
Output
Input
10 k ...
100 k
10
12
CLK
DI O
C1
AS5030
C2
VSS
100 n
VSS
Figure 7. Timing Diagram in 2-wire and 3-wire SSI Mode
14
15
3
command phase
data phase
CLK
1
2
3
4
5
6
7
8
20
21
CS
DIO
t1
t9
t 10
DIO read
DIO
D 15
D 14
D 13
D 12
D1
D0
DIO write
Table 4. Serial Bit Sequence (16-bit read/write)
Read
D20 D19 D18 D17 D16 D15 D14 D13 D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
0
C2
lock
D5
D4
AGC
D3 D2
D1
D0
D7
D6
D5
Angle
D4 D3
D2
D1
D0
www.ams.com/AS5030
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