Hi experts,
Please refer to below for my schematic with TCA6416ARTWR, I have 4 parts in this I2C bus, all the other three works well except this one.
1) VCCI and VCCP are powered with 3.3V directly, while I saw recommendation that VCCI comes up earlier than VCCP, will this be a problem?
2) I measured waveform, it seems this IO Expander won't response ACK.
3) For SCL and SDA are pulled-up to another 3.3V power rail, which rises up earlier than this 3.3V, is it OK?
4) Can I connect EPAD to GND? As I found this note in datasheet.
"The exposed center pad, if used, must be connected only as a secondary GND or must be left electrically open."
Thanks
Chris