Introduction
Osoyoo SX1278 LoRa Wireless 433mhz Uart Module is a wireless transceiver module based on SX1278 from SEMTECH(can be transmitter and receiver both). It adopts LoRa spread spectrum technology, with this technology the transmitting distance and penetration ability of the module improved more than 1 times compared with traditional FSK.
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Specifications
RF Parameter
| RF Parameter |
Value |
Remark |
| Working frequency |
410~441 MHz |
Default: 433MHz |
| Transmitting power |
10~20 dBm |
Default: 20dBm（About 100mW） |
| Receiving sensitivity |
-146 dBm |
Air data rate: 0.3kbps |
| Air data rate |
0.3k~19.2kbps |
Default: 2.4kbps |
| Test distance |
3000 meter |
In open and clear air, with maximum power, 5dBi antenna gain, height of 2m,
air data rate: 2.4kbps |
Hardware Parameter
| Hardware Parameter |
Value |
Remark |
| Size |
21 * 36 mm |
Without SMA |
| Antenna type |
SMA-K |
|
| Communication interface |
UART |
Baud rate: 1200~115200, default: 9600 |
| Package |
DIP |
|
| Buffer |
512 bytes buffer |
Automatically sub-packaging with 58 bytes per package |
Electronic parameter
| Electronic parameter |
Min. |
Typ. |
Max. |
Unit |
Condition |
| Power supply |
2.3 |
3.3 |
5.5 |
V |
|
| Communication level |
3.0 |
3.3 |
3.6 |
V |
|
| Transmitting current |
102 |
110 |
118 |
mA |
20dBm（100mW） |
| 90 |
93 |
96 |
mA |
10dBm（50mW） |
| Receiving current |
12 |
15 |
18 |
mA |
|
| Sleep current |
3 |
5 |
8 |
μA |
|
| Operating temperature |
-40 |
20 |
+85 |
℃ |
|
| Operating humidity |
10 |
60 |
90 |
% |
|
| Storage temperature |
-40 |
20 |
+125 |
℃ |
|
Pin Definition
| Pin No. |
Pin Item |
Pin Direction |
Pin Application |
| 1 |
M0 |
Input
（weak pull-up） |
Work with M1 & decide the four operating modes. Floating is not allowed, can be ground. |
| 2 |
M1 |
Input
（weak pull-up） |
Work with M0 & decide the four operating modes. Floating is not allowed, can be ground. |
| 3 |
RXD |
Input |
TTL UART inputs, connects to external TXD (MCU, PC) output pin.
Can be configured as open-drain or pull-up input |
| 4 |
TXD |
Output |
TTL UART outputs, connects to external RXD (MCU, PC) input pin.
Can be configured as open-drain or push-pull output |
| 5 |
AUX |
Output |
To wake up the external MCU, during the procedure of self-check initialization, the pin
outputs low level. Can be configured as open-drain output or push-pull output (floating
is allowed). |
| 6 |
VCC |
Input |
Power supply 2.3V-5.2V DC |
| 7 |
GND |
Input |
Ground |
| 8 |
Fixing hole |
|
Fixing hole |
| 9 |
Fixing hole |
|
Fixing hole |
| 10 |
Fixing hole |
|
Fixing hole |
Features
Reference
Certified Documents
