Users Manual

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LSN50 LoRa Sensor Node User Manual 8 / 55
6
PB6
In/Out
Directly from STM32 chip, 10k
pull up to VCC
7
PB7
In/Out
Directly from STM32 chip, 10k
pull up to VCC
8
PB3
In/Out
Directly from STM32 chip, 10k
pull up to VCC
9
PB4
In/Out
Directly from STM32 chip
10
PA9
In/Out
Directly from STM32 chip, 10k
pull up to VCC
11
PA10
In/Out
Directly from STM32 chip, 10k
pull up to VCC
12
GND
Ground
13
VCC(2.9V)
OUTPUT
VCC
Directly connect to main
power for board
14
Jumper
Power on/off jumper
15
PA4
In/Out
Directly from STM32 chip
16
NRST
In
Reset MCU
17
PA12
In/Out
Directly from STM32 chip
18
PA11
In/Out
Directly from STM32 chip
19
PA14
In/Out
Directly from STM32 chip
20
PB13
In/Out
Directly from STM32 chip
21
PB12
In/Out
Directly from STM32 chip
22
PB15
In/Out
Directly from STM32 chip
23
PB14
In/Out
Directly from STM32 chip
24
PA13
In/Out
Directly from STM32 chip
25
PA8
In/Out
Directly from STM32 chip
Default use to turn on/off LED1
in LSN50 image
26
GND
Ground
27
+5V
Out
5v output power
Controlled by PB5(Low to
Enable, High to Disable)
28
LED1
Controlled by PA8
Blink on transmit
29
BOOT MODE
Configure device in working
mode or ISP program mode
Flash: Normal Working mode
and send AT Commands
ISP: UART Program Mode
30
NRST
In
Reset MCU
1.6 Hardware Change log
LSN50 v2.0:
 Change to a new enclosure. Improve with external antenna, IP68, ear hook.
LSN50 v1.3:
 Add P-MOS to control 5V output