Datasheet [Page 29]
EMW3166
EMW3166 UART is 3.3 V, if the user use UART chip is 5 V, the need to convert the voltage, can with EMW3162
UART communication, please refer to the 5 V to 3.3 V UART conversion circuit Figure 19.
Figure 19 UART 5 V - 3.3 V conversion circuit
