Application Note
7 of 28
V 1.0
2019-04-28
User manual for MA120xxx reference boards
Board overview
1.5
Device configuration through I
2
C
Multi-level technology offers the possibility to optimize for audio performance, efficiency or EMI. Depending on
the application, typically one parameter is more important than the others. The amplifiers offer the flexibility to
make this design trade-off by the use of different optimal modes (Power Mode Profiles or PMP), selected
through internal register settings. The RFB uses the MA120XXX in the default PMP0, which optimizes the
amplifier operation for highest power efficiency in the low to mid output power region. For a complete
overview of device configurations, please refer to the datasheets.
I
2
C is used to read and write the internal registers. SCL and SDA can be accessed through Pin 5 and Pin 4 on the
PCTRL header (see previous section). Figure 3 shows how to set up I
2
C communication using an Arduino UNO.
Sample code for I
2
C set-up can be found in Apendix A – sample code.
Figure 3
Arduino I
2
C communication to the RFB
Pull-up