EWM32M-900T20S 868/915MHz LoRa Wireless Serial Port Module Support Multiple transmission modes compatible with E32 series Low power design Efficient watchdog
[Chip solution]：LoRa solution
[Frequency]：868/915MHz
[Transmitting power]：20dBm
[Communication distance]：5km
[Size]：14*20mm
[Product weight]： 2.0±0.1g
[Introduction]：EWM32M-900T20S series is an ultra-small, low-cost wireless serial port module (UART). It uses LORA communication technology that is fully compatible with E32. Its transmission power is 20dBm, it has multiple transmission modes, works in the 868/915MHz frequency band, has TTL level output, and is compatible with 3.3V IO port voltage. The wireless module has the advantages of longer communication distance, strong anti-interference ability, and strong confidentiality.
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| Pin number | Pin Name | Pin Direction | Pin Purpose |
| 1 | GND | - | Module ground wire |
| 2 | NC | - | Empty foot (not open for use, users do not need to care) |
| 3 | GND | - | Module ground wire |
| 4 | GND | - | Module ground wire |
| 5 | TX_EN | Output | Used with RX_EN to control external PA; left unconnected if not used |
| 6 | RX_EN | Output | Used with TX_EN to control external PA; left unconnected if not used |
| 7 | CLK | Input/Output | SWCLK Clock pin when program is loaded (suspended, user does not need to connect) |
| 8 | PART | Input/Output | SWDIO data pin when program is loaded (suspended, user does not need to connect) |
| 9 | NC | - | Empty foot (not open for use, users do not need to care) |
| 10 | NC | - | Empty foot (not open for use, users do not need to care) |
| 11 | NC | - | Empty foot (not open for use, users do not need to care) |
| 12 | NC | - | Empty foot (not open for use, users do not need to care) |
| 13 | GND | - | Module ground wire |
| 14 | VCC | - | Module power positive reference, voltage range: 2.7～5.5V DC |
| 15 | TXD | Output | TTL serial port output, connected to the external RXD output pin; |
| 16 | RXD | input | TTL serial port input, connected to external TXD output pin; |
| 17 | M1 | input | Cooperate with M0 to determine the 4 working modes of the module ( cannot be left floating , can be grounded if not used) |
| 18 | M0 | input | Cooperate with M1 to determine the 4 working modes of the module ( cannot be left floating , can be grounded if not used) |
| 19 | TO | Output | Used to indicate the working status of the module; the user wakes up the external MCU, and outputs a low level during the power-on self-test initialization period; (can be left floating) |
| 20 | NC | - | Empty foot (not open for use, users do not need to care) |
| 21 | RESET | input | Module reset pin, low level reset. |
| 22 | GND | - | Module ground wire |
| 23 | ON | - | Antenna interface (high frequency signal output, 50 ohm characteristic impedance) |
| 24 | GND | - | Module ground wire |