The TYLC4 Module Single Socket with a USB Port

Last Updated on : 2021-04-22 10:20:45download

This topic describes the typical circuit design and the package of TYLC4 module single socket with a USB port.

Typical application diagram

The typical application diagram of the TYLC4 module single socket with a USB port is as follows. The TYLC4 Module Single Socket with a USB Port

S1 button is a reset button of the Wi-Fi module, and D2 is a status indicator light of the Wi-Fi module. The relation between the default D2 status for Tuya products and Wi-Fi module working status is as follows.

D2 status D2 display Working status of Wi-Fi module
Flicker fast On and off interval is 250 ms Fast connection mode (SmartConfig mode)
Flicker slowly On and off interval is 1,500 ms Compatible mode (AP pairing mode)
Always on Always on Wi-Fi module is connected to the router
Always off Always off Wi-Fi module is disconnected from the router

Circuit design

Parameter Description
Wi-Fi power consumption 3.3V/100 mA. When the 3.3V Wi-Fi module is transmitting or receiving RF, the current increases by 50%. For a 3.3V module, the recommended supply current is ≥ 300 mA. The total capacitance value of the external filter capacitor is greater than 10 μF.
C1/C2 Power filter capacitor. During design in the PCB Layout software, the capacitors should be arranged near the VCC pin.
TXD/RXD serial port It is a serial port mode by default.
Note: If you need to use this serial port as a general I/O port, contact technicians.
RST pin The module reset pin, which is active low. To use the RST pin, connect it to the I/O port of the MCU. Make sure that the electrical level is matched.
Button Reuse switch function and Wi-Fi reset function.
  • Press the button: Turn on or off the relay.
  • Press and hold for 5 seconds: Clear Wi-Fi configurations.
D2 Wi-Fi indicator. It indicates the current working status of the Wi-Fi module and smart products.
Driver relay pin The 3.3K pull-down resistor to the ground is required. Otherwise, the relay might be wrongly turned on when the program is not started after power-on.
Other unused pins They can float.

I/O port specification

Function I/O port Description
Driver relay I/O12 Active high, relay closed
USB switch I/O14 Active high, the micro USB port is on
Button I/O13 Active low
Wi-Fi status indicator I/O4 Turn on in case of low level
Relay status indicator I/O5 Turn on in case of low level

Contact us for the Wi-Fi module of this demo.