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Published 20 hours ago • verified publisher icon sparkfun

Voltage levels

Open mrherman opened this issue 9 months ago • 0 comments

I haven't tried this hat yet, but confused how it is wired up. The schematic shows the PCA9685 being powered from the 5V signal, but it then expects a 0.7 Vdd voltage or higher for the I2C. Table 14 of the data sheet. That is 3.5V, but the I2C line of the Pi is a 3.3V logic level.

Is this really powered via the 5V line? Any issues with I2C not working periodically?

In addition it looks like the address lines are left floating? The data sheet said they don't have internal pull up resistors on those pins, so they are truly floating?

mrherman avatar Jan 06 '25 17:01 mrherman