as5030 austriamicrosystems, as5030 Datasheet - Page 9

• Manufacturer Part Number: as5030
• Description: 8-bit High-speed Absolute Magnetic Rotary Encoder
• Manufacturer: austriamicrosystems

AS5030 8-bit Programmable Magnetic Rotary Encoder
4.12 Connecting the AS5030
The following examples show various ways to connect the AS5030 to an external controller:
4.13 Serial 3-Wire R/W Connection
Figure 4: SSI read/write serial data transmission
Figure 5: Timing diagram in 3-wire SSI R/W mode (timing values in 4.11: General Data Transmission Timings)
Serial bit sequence (16bit read/write):
4.14 Serial 3-Wire Read-only Connection
Figure 6: SSI read-only serial data transmission
Rev. 1.8
C4
VSS
VSS
VDD
VDD
+5V
+5V
Write Command
C3
Micro
Controller
Micro
Controller
VDD
VDD
VSS
C2
VSS
Output
Output
Output
Output
C1
Input
I/O
C0
10k...
100k
D15
11
10
11
10
12
12
D14
CS
CLK
DIO
CS
CLK
DIO
14
14
AS5030
C1
AS5030
C1
D13
13
13
15
15
VDD
VDD
C2
C2
www.austriamicrosystems.com
D12
VSS
VSS
3
3
D11
100n
100n
D10
Read/Write Data
In this mode, the AS5030 is connected to the external
controller via three signals:
Chip Select (CS), Clock (CLK) 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 AS5030 in and out of the
reduced power modes.
A pull-down resistor (as shown in 4.14) is not required.
C1 and C2 are hardware configuration inputs. C1 must always
be connected to VSS, C2 selects 3-wire mode (C2 = low) or 2-
wire mode (C2 = high)
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 (see 4.13), 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.
Note: all further application examples are shown in R/W
mode, however read-only mode is also possible unless
otherwise noted.
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
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