Doiting ESP-M1 Gebruikershandleiding - Pagina 13

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8. Minimum User System

This module can work just at 3.3V working voltage:

Note

(1) the working voltage for module is DC 3.3V;

(2) the max current from IO of this module is 12mA;

(3) RST Pin is enabled when it is low level; and EN pin is enabled when it is high level;

(4) WiFi module is at update mode: GPIO0 is low level, then module reset to power; Wi-Fi module

is at working mode: GPIO0 is at high level, and then reset to power;

(5) Wi-Fi module is connected to RXD of the other MCU, and TXD is connected to RXD of the

other MCU.

9. The Recommended PCB Design ( Take ESP-M2 as an Example)

ESP-Mx Wi-Fi module can be sold on PCB board directly. For the high RF performance for the device,

please notice the placement of the module. There are three ways to use the module.

Solution 1:optical solution. The WiFi module is placed on the side of the board, and the antennas are

all exposed, and there is no metal material around the antenna, including wires, metal casings, weight

plates, and the like.

Solution 2:suboptical solution. The WiFi module is placed on the side of the board, and the antenna

below is hollowed out. There is a gap of not less than 5 mm reserved with the PCB, and there is no metal

material around the antenna, including wires, metal casings, weight plates, and the like.

Solution 3: The WiFi module is placed on the side of the board, and the PCB area under the antenna is

empty, and copper cannot be laid.

ESP-M1/M2 User Mannual

Fig.8.1 minimum system

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