The TYLC4 Module Single Socket with a USB Port

Last Updated on : 2022-11-07 01:40:48download

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.

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