TYWE3S Module & MCU serial communication instructions
2
DESIGN SPECIFICATION
2 Design specification
1. Module power supply consumption
：
3.3V/100mA, instantaneous current(5us)
450mA. Proposed supply current≥300mA.
2. Power filter capacitor C1 & C2 should be distributed as close to VCC pin as
possible.
3. Serial port TXD & RXD are communication ports. At startup, there will be a
lot of module information data output. Default setting Baud rate: 9600, Data
level: 8 bit, Stop bit: 1 bit, No check bit, No flow control.
4. ADC pin is voltage collection pin, can’t be used as normal IO function. If idle,
it needs to be suspended.
5. IO 0 participates in the module for normal startup, when the power is on, this
pin’s level needs the high level for normal startup. For the export, a pull-up
resistor is recommended. For the import, the input level should be considered.
If idle, it can be suspended processing.
6. IO 2 participates in the module for normal startup, when the power is on, this
pin’s level needs the high level for normal startup. The default mode is module
debugging port, and data output is available on the upper current. If idle, it
can be suspended processing.
7. IO 15 participates in the module for normal startup, When the power is on, the
pin’s level needs the low level for normal startup. You need to add a pull-down
resistor to your pin.
8. RST pin is module hardware reset pin, reset under the low level. For use, it can
be directly connected to MCU’s IO port without external circuit.
9.
Please note that there is no pull-up resistor inside of IO16 when used
10. The module also needs the button and Wi-Fi status indicator. The button is used
to clear network information of the module. The indicator is used to indicate
the current status of the Wi-Fi module. If choose the module self-processing
mode, refer to Diagram 1. If choose MCU & Module cooperative processing
mode, refer to Diagram 2. Mode instructions can refer to “3.3 Query module
work mode of MCU settings” in “Tuya general serial communication protocol”.
11. If MCU supply voltage is 3.3V, circuit section about the signal level conversion
in the reference diagram can be omitted.
12. The pins 9-14 need to be suspended, and other idle pins also need to be sus-
pended.
13. Figure 3 the ANTENNA part is the position of antenna, which is forbidden to
cover the copper & wire. It’s better to empty this area of PCB, so as not to
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