联想到这个 I2C 并不是直连芯片，而是经过了一个 I2C 交换机（Bus Switch），PCA9646 2 。所以问题可能出在这里。 I2C Bus Switch 到底有啥用呢，明明 I2C 自己就可以接多个设备，为什么需要一个 Switch 呢？

software I2C implementations often do, but some devices might not like it. Hosts often run at 100kHz, but it’s common that you can up the frequency and switch it into 400kHz; however ...

If the I2C HID Device Driver is not working on Lenovo, Dell, Acer, ASUS, etc laptop, then follow this guide to fix the problem in Windows 11/10. A wide array of factors can contribute to the said ...

six I2C controllers, and six UARTs – all on its 40-pin header. You can’t make use of all of these at once, but with up to four different connections wired to a single pin you can carve out a ...

A hardware controller providing rotary encoders, switches and potentiometers, interfacing with a host / master device via I2C 2-wire serial link and interrupt pin. I2C Hardware Controller provides an ...

“This new IP core lets system developers easily switch between I2C and SPI as needed without building in a separate core for each interface,” said Evan Price, sales engineer for CAST. “While I2C and ...