The scenario
Designing a USB-powered computer mouse circuit that requires ESD protection on the D+ and D- lines and noise filtering on the power supply to prevent interference with sensitive optical sensors.
What is in this drawing
Read the decisions behind it.
01
Use dual-diode clamping on each data line to VCC and GND
02
Add a ferrite bead in series with the USB VCC line to filter high-frequency noise
03
Place a 100nF ceramic bypass capacitor close to the microcontroller's power pins
This circuit can be reused for any USB peripheral needing ESD immunity and clean power, such as keyboards, gaming mice, or USB sensors.
More like this