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Barryblueice edited this page Dec 31, 2025 · 4 revisions

Hardware OpenSource Link：ESP32-Precision-Touchpad

USB2.0 differential impedance is 90ohms, I2C single-ended impedance is 50ohms.

Impedance control standard: JLC04161H-3313, choose 1.0mm for thickness if ordering PCB.

A CH340K auto download circuit is intergrated. CH340K, ESP32 and fingerprint module are connected to the USB2513B's downstream ports.

About touchpad model chosen, I use the ELAN touchpad from Lenovo (Rev.A S8974A):

image image

And fingerprint module, You can find it by searching for keywords such as FM3483/3633/FS7605.

Apperence still modeling by SOLIDWORKS.

If actual soldering, do not solder R15, R38, R41, R42, U8.

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