E07-m1101d Pinout File

Understanding the pinout prevents three classic mistakes:

Looking at the module from the top (shielded can facing up), the pads are arranged as follows: e07-m1101d pinout

| Pin | Name | Direction | Description | |-----|----------|-----------|-----------------------------------------------| | 1 | GND | Power | Ground (0V) | | 2 | VCC | Power | Power supply (1.8V – 3.6V DC) | | 3 | RXD | Input | UART Receive (Connect to TX of host MCU) | | 4 | TXD | Output | UART Transmit (Connect to RX of host MCU) | | 5 | AUX | Output | Indicator pin (Low = busy, High = ready/idle) | | 6 | M0 | Input | Mode setting pin 0 (Internal pull-down) | | 7 | M1 | Input | Mode setting pin 1 (Internal pull-down) | | 8 | RST | Input | Reset (Active low; pull high for normal run) | | 9 | NC | – | No connection (leave floating) | | 10 | GND | Power | Ground (0V) | | 11 | ANT | RF | Antenna (50Ω, usually via a hole/pad) | | 12 | GND | Power | Ground (0V) | Note: Pins 1–10 are the 1

Note: Pins 1–10 are the 1.27mm pitch castellation pads along the module edges. Pin 11 (ANT) and Pin 12 (GND) are typically the two large pads near the antenna area. While strictly not a "pin" in the header

While strictly not a "pin" in the header sense, the dedicated RF output pad and its adjacent ground must be discussed. The E07-M1101D typically features a stamped hole or a small pad for soldering a helical spring antenna or a u.FL connector. This RF pin has a 50-ohm characteristic impedance. Connecting this incorrectly—using a long, untwisted wire or a sloppy solder joint—will destroy the module’s range and could even damage the internal power amplifier due to reflected power (high VSWR). The dedicated ground pin next to the antenna is not optional; it provides the RF return path and must be connected directly to the system’s ground plane.