WAVESHARE ELECTRONICS
WIFI232 User Manual
Page 21 of 81
User can add RS-232 chipset on user board and convert the signal to RS-232 voltage to
communicate with outside equipment or sensors. WIFI232 modules UART interface include 4
general signals: TXD/RXD/RTS/CTS. The hardware reference design with RS-232 chipset as
following:
Figure 15
Figure 1 UART Interface Reference Design
Notes:
TXD pin is also hardware configuration pin internal module. So this pin MUST pull-down
during module power up. WIFI232 modules provide internal pull-
down resister, user can‟t add
pull-up/pull-
down resister on user board, which may cause module can‟t work.
3.5.4 Power Interface
WIFI232 module support single +3.3V power supply. The peak current shall about 350mA and
normal WiFi working current shall about 200mA. The power save (WiFi OFF) mode will about
100mA
Decoupling at power pin suggested, At least one 100uF and one 10uF capacitor required at user
board and put near module power input pin will increase the reliability and performance.
4 Modules Function Description
4.1 User configuration process
After WIFI232 module electric starter, based on user pre-set parameters, automatically connect to
wireless networks and servers, and enter the working mode is set to open in accordance with the
default serial port parameters.
The parameters which need to configure include:
