E330-400T13S 433/470MHz 20mW wireless module
[[Frequency]]：410.125~493.125MHz
[[Power]]：13dBm
[[Distance]]：2.5km
[[Size]]：16*26mm
[Introduction]：E330-400T13S is a small size, low power consumption, low cost, ultra-high cost-effective serial port module, integrated transceiver, covering 433MHz and 470MHz frequency bands.
| No. | Name | Direction | Function |
|---|---|---|---|
| 1 | GND | - | Module ground |
| 2 | GND | - | Module ground |
| 3 | GND | - | Module ground |
| 4 | GND | - | Module ground |
| 5 | M0 | Input (very weakpull-up) | Cooperate with M1 to determine the 4 working modes of the module. (Can not be suspended, if not used, it can be grounded) |
| 6 | M1 | Input (very weakpull-up) | Cooperate with M0 to determine the 4 working modes of the module. (Can not be suspended, if not used, it can be grounded) |
| 7 | RXD | Input | TTL serial port input, connected to the external TXD output pin; |
| 8 | TXD | Output | TTL serial port output, connected to the external RXD input pin; |
| 9 | AUX | Output | Used to indicate the working status of the module; the user wakes up the external MCU, and outputs low level during power-on self-check initialization; (can be left floating) |
| 10 | VCC | - | Module power supply positive reference, voltage range: 3~3.6V DC |
| 11 | GND | - | Module ground |
| 12 | NC | Reserved | （OCDSCK） |
| 13 | GND | - | Module ground (GND) |
| 14 | NC | Reserved | (OCDSDA) |
| 15 | NC | Reserved | (VDD） |
| 16 | NC | Reserved | PA4 |
| 17 | NC | Reserved | PA2 |
| 18 | NC | Reserved | GPIO3 |
| 19 | GND | - | Module ground |
| 20 | GND | - | Module ground |
| 21 | ANT | - | antenna |
| 22 | GND | - | Module ground |