u-blox SARA-R4 is an LTE-M/NB-IoT module in LCC footprint with built-in TCP/IP stack, HTTP/MQTT client, and AT command interface for low-power IoT applications in smart metering and asset tracking.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | VCC | Supply voltage 3.3V-4.2V | PWR |
| 2 | GND | Ground | GND |
| 3 | TX | UART transmit from module | BUS |
| 4 | RX | UART receive to module | BUS |
| 5 | CTS | UART CTS | BUS |
| 6 | RTS | UART RTS | BUS |
| 7 | RESET_N | Module reset active low | I/O |
| 8 | PWR_ON | Power on signal | I/O |
| 9 | V_INT | Interface voltage reference | I/O |
| 10 | ANT_MAIN | LTE-M antenna port | BUS |