Product
Name
Version
Doc No
Date
Page
S76S/S78S SDK Manual
C
May 3, 2017
5 of 33
2. Hardware Interface
2.1 Connections between MCU & SX1276
STM32L073X MCU and SX1276 connect with SPI interface and one Reset
pin. SPI runs in full-duplex mode and uses 4-pin (SCK, MOSI, MISO and NSS)
to communicate. Normally, user doesn’t need to configure SPI on this
developing board, MCU and SX1276 can already operate well on AcSiP’s
default configuration.
As the figure 2.2 tells, STM32L073X MCU and SX1276 are packaged as
SiP (System in Package) and named as S76S/S78S which is located in the
center of the EK-S76SXB/EK-S78SXB board (the center part of figure 2.2).
2.2 Pins definition
2.2.1 XB board Peripheral List
The supporting peripheral interface & important endpoint on XB board
area listed below:
Figure 2.1
Figure 2.2
a. Mini USB port
Only used for providing 5V power supply, no any USB protocol
functions.
b. 5v-To-3.3V regulator (LDO) & Li-on battery charger IC
c. USB to UART IC
