AMS AS5030 Manual de instrucciones - Página 6
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Adapterboard Operation Manual
5 Using the serial interface with MCU
The most complete and accurate solution for a MCU to read the angle of a magnet is the serial interface.
The 8 bit value of the angle will be directly read, and some other indicators as AGC value or alarm bits can be read at the
same time.
Serial commands can be sent to the AS5030 as well, like the low power mode, lock AGC or reset.
Note: The MCU must have 5V I/O connected to the AS5030 adapter board, the AS5030 is a 5V device.
The connection between the MCU and the adapter board can be made with 2, 3 or 4 wires.
5.1
2-wire serial interface
Jumper configuration: P1 close, P2 open.
Figure 7: Bidirectional serial connection (2 wire)
By opening P2, the AS5030 is configured to 2-wire data
transmission mode.
Only Clock (CLK) and Data (DIO) signals are required. A
Chip Select (CS) signal is automatically generated by the
DX output, when a time-out of CLK occurs (typ. 20μs).
See AS5030 datasheet chapter 4.15.
Revision 1.0, 26.February 2009
5.2
Jumper configuration: P1 and P2 close.
The MCU GPIO used for the DIO data signal should be
bi-directional: the MCU sends a 5 bit command first then
receives a 16 bit value on the same line. The DI input of
the adapter board must be connected to GND in this
mode.
The C source code for reading an angle with this
hardware configuration is described in Chapter 7.
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3-wire serial interface
Figure 8: Bidirectional serial connection (3 wire)
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