Hello,
I am developing a board with the LIS2DUXS12 accelero.
During testing after assembly, I saw that there was no reaction to I2C communication. Other devices on the bus work fine, with a logic analyzer I have seen that there is indeed traffic sent to 0x18.
I desoldered the component and saw that during assembly, was too little paste on the VDDIO and the SCL pin. I corrected it and resoldered the component and saw there was good contact under the microscope. I have connected the STEVAL$MKI235AA to the pins and that responds correctly.
I still see the same behavior, so my first question is this:
1. Are VDD and VDDIO completely isolated from each other such that VDD won't internally be connected to VDDIO in the event of a bad connection to VDDIO, the digital interface pins are in danger of being damaged?
2. I also am looking for a sanity check of my schematic. I have only 1uF + 100nF on the supply as 10uF seems extremely overkill for pulling <50uA and adds to the power rail capacitance, affecting inrush current (in very small PPG applications, often the bus capacitance can be a problem point for tiny DC/DC regulators).
NOTE: In this schematic picture, ADDR0 is left floating as it is a development board to have the flexibility of tying it to VDD or GND. 1uF bulk capacitance not pictures
I would appreciate if someone could sanity check my schematic to make sure that the assembly VDDIO floating pin likely damaged the interface and not that I simply made a mistake in my schematic that I can easily solve.
Thank you for your time
