LoDev
Overview
The Ronoth LoDev is a small open source board containing a AcSIP S76S SiP from AcSIP. The full LoDev design details are available on GitHub. The LoDev board can be purchased from Ronoth or from CrowdSupply.
The S76S contains an STMicro STM32L073RZ MCU, a Semtech SX1276 LoRaWAN transceiver, and a +20 dBm power amplifier. Refer to AcSIP S76S Product Information Brief for details.
Zephyr applications may use the ronoth_lodev configuration to run on this board.
Board design files are available on GitHub.
Device Resources
The embedded STMicro STM32L073RZ has some GPIOs and SPI2 internally committed to the LoRaWAN transceiver operation. See internally dedicated ports for a list of resources committed to this function.
Debugging
Programming and debugging uses the SWD port, as on any STM32 processor. An ST-LINK/V2 adapter may be used with the appropriate software (st-utils package on Linux).
Connector Pin-Out
The LoDev has two rows of headers. Pin 1 on both connectors is closest to the micro-USB connector on the board, furthest from the RF (antenna) connector.
When viewed from the top (component) side of the board, with the micro-USB connector closest and RF (antenna) connector furthest away, the CN6 connector is on the left, the CN7 connector is on the right.
UART1 on the S76S SiP is connected to a USB-to-UART device connected to the micro USB connector, so generally PA9 and PA10 are unavailable for I/Os.
A helpful silkscreen legend is provided on the board.
Ronth LoDev Pinout
CN6 Pin-Out
Pin |
Function |
Note |
|---|---|---|
1 |
3.3V |
Output 500 mA max |
2 |
GND |
|
3 |
PC1 |
|
4 |
PC0 |
|
5 |
PB8 |
|
6 |
BOOT0 |
|
7 |
PB7 |
|
8 |
PB6 |
|
9 |
PB5 |
|
10 |
PD2 |
|
11 |
PC12 |
|
12 |
PC11 |
|
13 |
PC10 |
|
14 |
PA14 |
SWCLK |
15 |
PA13 |
SWDIO |
16 |
PA12 |
|
17 |
PA11 |
|
18 |
PA9 |
USB serial Tx drives this pin (input) for UART1 |
19 |
PA10 |
USB serial Rx is driven by this pin (output) for UART1 |
20 |
PA8 |
CN7 Pin-Out
Pin |
Function |
Note |
|---|---|---|
1 |
PC2 |
|
2 |
PC3 |
|
3 |
nRESET |
|
4 |
PA0 |
|
5 |
PA2 |
|
6 |
PA3 |
|
7 |
PA4 |
|
8 |
PA5 |
|
9 |
PA6 |
|
10 |
PA7 |
|
11 |
PC4 |
|
12 |
PC5 |
|
13 |
PB0 |
|
14 |
PB1 |
|
15 |
PC6 |
|
16 |
PC7 |
|
17 |
PC8 |
|
18 |
PC9 |
|
19 |
GND |
|
20 |
PA1 |
Used in S76S as “RF FEM CPS” |
Internally Dedicated Ports
Pin name |
Pin Type |
I/O Structure |
Note |
Function |
|---|---|---|---|---|
PA15 |
I/O |
FT |
INTERNAL SX1276 D5 |
|
PB3 |
I/O |
FTf |
INTERNAL SX1276 D4 |
|
PB4 |
I/O |
FTf |
INTERNAL SX1276 D3 |
|
PB9 |
I/O |
FTf |
INTERNAL SX1276 D2 |
|
PB10 |
I/O |
FT |
INTERNAL SX1276 Reset |
|
PB11 |
I/O |
FT |
INTERNAL SX1276 D0 |
|
PB12 |
I/O |
FT |
INTERNAL SX1276 SPI nCS |
|
PB13 |
I/O |
FTf |
INTERNAL SX1276 SPI2_SCK |
|
PB14 |
I/O |
FTf |
INTERNAL SX1276 SPI2_MISO |
|
PB15 |
I/O |
FT |
INTERNAL SX1276 SPI2_MOSI |
|
PC13 |
I/O |
FT |
INTERNAL SX1276 D1 |
References
License
This document Copyright (c) 2021 Dean Weiten <dmw@weiten.com>
SPDX-License-Identifier: Apache-2.0