Need someone to look over my circuit

[paul.vlker]

Hey ppl,
I have recently created a modular Circuit design, to function as a slave PCB and to control and give feedback from all kind of Data (Stepper Control, Temperature feedback, I2C connection ... -> described in the schematics).
I am looking for someone to have a quick expert look over it, as I am just an electronic beginner with not much experience. Obviously you won't be able to correct circuitry of external outputs such as StepperDriver-output, as no docs are available.

I am mostly concerned over the circuitry of the CP2102N, as the documentation was hard to read. Also is the connection from the Power Selector (CPC1117NTR) correct, and will work as described?
Are the transistors (BCX56-16,115) used appropriate for my circuit?
(VCC can vary from 12V - 14.9V)

If more Information is needed, please advise kindly.

Thank you very much in Advance.
Paul

Here the links to the data sheets of the important parts of the Boards:
CP2102N: https://datasheet.lcsc.com/szlcsc/1811151524_SILICON-LABS-CP2102N-A01-GQFN24_C80225.pdf
CPC1117NTR: https://datasheet.lcsc.com/szlcsc/1809071810_IXYS-CPC1117NTR_C150424.pdf
HT7550-7: https://datasheet.lcsc.com/szlcsc/1810201512_Holtek-Semicon-HT7550-7_C105221.pdf
BCX56-16,115: https://datasheet.lcsc.com/szlcsc/1810192121_Nexperia-BCX56-16-115_C100026.pdf
Short Doc. of ATMEGA328P-MU : https://datasheet.lcsc.com/szlcsc/1809192132_Microchip-Tech-ATMEGA328P-MU_C38896.pdf

 

[bertus]

Hello,

If the buzzer is really a FST4020, you will likely never hear it.
The coil resistance is about 17 Ohms, so there will be no voltage on the buzzer left.

The datasheet shows this circuit for driving the buzzer:



Bertus

 

[WHONOES]

See attached a chart that shows sound pressure levels versus perceived intensity.

http://www.sengpielaudio.com/TableOfSoundPressureLevels.htm

 

[paul.vlker]

Thank you very much for your replies. I have overworked and tested the circuit and came to the same assumption. Now I have just connected the buzzer to pin 11 and GRND. This works really good, when a PWM Wave is being send.
Thank you
Paul