Cermetek Microelectronics, Inc Page 10 of 42
Document NO. 607-00xx Revision A (12/13)
Figure 7: UART Interface Reference Design
Notes
:
CH232BGN modules incorporate an internal pull-down resister on the serial interface signals;;
therefore, the User cannot add pull-up or pull-down resisters to the serial interface signals.
1.3.4. Power
CH232BGN module utilizes a 3.3V power supply. The typical peak current is 350mA. During
normal WiFi operation the module draws about 200mA. Current draw with WiFi OFF is 100mA.
Cermetek recommends decoupling be added at the power pin of the CH232BGN. At least one 100uF
and one 10uF capacitor are recommended for maximum reliability and performance. The decoupling
capacitors should be added as close to the CH2332BGN power pin as possible.
1.4. Software Reference Design
The following flow chart illustrates the prober flow for user code should on CH232BGN boot-up:
Figure 8: User Software Boot Flow Chart
