UART Connections!

[qammarabbas]

Hi,

I found a reference schematics of T1042. While connecting UART's pins to the DB9 connector (through driver IC), it uses a series RLC circuit. Can somebody explain its reason? 

Please find the attached image for your information. Thank you!

[r8070z · Accepted solution]

Have a great day,

The series RLC circuit is a low-pass filter. It cuts radio-frequency noise and decreases electromagnetic interference (EMI).    

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[qammarabbas]

Thank you!