Hardware Manual: emSTAMP- emSBC-Argon (Rev1)
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5.11
I
2
C Interface
Up to six I2C bus interface are available at the STM32MP157. The interfaces I2C1 and I2C5 are
directly connected as LVTTL signals to the castellated mounting holes of the module. At both I2C
interfaces there are no pull-up resistors equipped on the emSTAMP-Argon module. The pull-up
resistors have to be added on the carrier board.
The I2C interfaces and support standard (up to 100 Kbit/s) and fast mode (up to 400 Kbit/s) and fast
mode-plus (up to 1Mbit/s). They also support SMBus 2.0 and PMBus 1.1.
Module Pin
CPU Pin Name
Signal
Direction
(module view )
Termination
75
PA12
I2C5_SDA
I/O
76
PA11
I2C5_SCL
O
77
PF15
I2C1_SDA
I/O
78
PD12
I2C1_SCL
O
5.12
SPI Interface
On the emSTAMP-Argon module the SPI1 interface is directly connected to the castellated
mounting holes. SPI1 can communicate at up to 50Mbit/s.
Module Pin
CPU Pin Name
Signal
Direction
(module view )
Termination
68
PZ0
SPI1_SCK
O
69
PZ3
SPI1_CS#
O
70
PZ2
SPI1_MOSI
O
71
PZ1
SPI1_MISO
I
5.13
Serial Audio Interface (SAI)
The STM32MP157 offers a serial audio interface (SAI) with two independent sub-blocks. The SAI
supports audio protocols like I2S (LSB or MSB-justified), PCM/DSP, TDM, AC’97 and SPDIF (SPDIF
only as transmitter. The SAI supports sampling frequencies up to 192 KHz. The data size may be 8,
10, 16, 20, 24 or 32bits.
On the emSTAMP-Argon module the SAI2 of the STM32MP157 is connected to the castellated
mounting holes. A master clock output signal is also connected.
Module Pin
CPU Pin Name
Signal
Direction
(module view )
Termination
45
PF11
SAI2_SD_B
I
46
PI6
SAI2_SD_A
O
47
PI5
SAI2_SCK_A
O
48
PE0
SAI2_MCLK_A
O
49
PI7
SAI2_FS_A
O
