The Two-wire Interface (TWI) interconnects components on a unique two-wire bus, made up of one clock line and
one data line with speeds of up to 400 kbit/s in Fast mode and up to 3.4 Mbit/s in High-Speed Client mode only,
based on a byte-oriented transfer format.
It can be used with any Two-wire Interface bus Serial EEPROM and I²C-compatible devices, such as a Real-Time
Clock (RTC), Dot Matrix/Graphic LCD Controller and temperature sensor. The TWI is programmable as a host or a
client with sequential or single-byte access. Multiple host capability is supported.
Table 4-7. I²C Interface Configurations
Interface
Instance
IO Set Pin # PIO
Pin Name
Comment
TWI1
3
120 PD19
TWD1
No need of external pull-up. Already integrated in ATSAMA5D27-
WLSOM1 module
TWI1
3
122 PD20
TWCK1
FLEXCOM0
1
28
PB28 FLEXCOM0_IO0
Need external pull-up in case the FLEXCOM interface is used as an
I²C/TWI interface.
FLEXCOM0
1
27
PB29 FLEXCOM0_IO1
FLEXCOM2
1
171
PA6 FLEXCOM2_IO0
FLEXCOM2
1
173
PA7 FLEXCOM2_IO1
FLEXCOM2
2
127 PD26 FLEXCOM2_IO0
FLEXCOM2
2
123 PD27 FLEXCOM2_IO1
FLEXCOM3
1
22
PA15 FLEXCOM3_IO0
FLEXCOM3
1
175
PA13 FLEXCOM3_IO1
FLEXCOM3
2
58
PC20 FLEXCOM3_IO0
FLEXCOM3
2
63
PC21 FLEXCOM3_IO1
FLEXCOM4
1
39
PC28 FLEXCOM4_IO0
FLEXCOM4
1
38
PC29 FLEXCOM4_IO1
FLEXCOM4
2
119
PD12 FLEXCOM4_IO0
FLEXCOM4
2
116
PD13 FLEXCOM4_IO1
4.6.7
Interfacing with CLASS-D Audio Output
The Audio Class D Amplifier (CLASSD) is a digital input, pulse width modulated (PWM) output mono Class D
amplifier. It features a high-quality interpolation filter embedding a digitally controlled gain, an equalizer and a
de-emphasis filter.
On its input side, the CLASSD is compatible with most common audio data rates. On the output side, its PWM output
can drive either:
• high-impedance single-ended or differential output loads (Audio DAC application) or,
• external MOSFETs through an integrated nonoverlapping circuit (Class D power amplifier application).
SAMA5D27 Wireless SOM1
Functional Description
©
2021 Microchip Technology Inc.
and its subsidiaries
Complete Datasheet
DS60001590D-page 43
