I create a board using ICM-20789 by referring to the AN-000105-ICM-20789-EVB-v1.0.pdf. The schematic of this is attached. When I try to measure the voltage at a test point for Pin 10 REGOUT, I didn't see 1.8v as expected, instead, it is 0v; and I2C commands have no response. As the chip is 24-lead LGA package, I have no idea how to measure each pad directly. I try to find an ICM-20789-EVB from distributors, but no one has it. The only document I can find online is it's datasheet and AN-000105 for EVB, which are not consistent for some pin definitions like pin 1, 19-21: DS defines them NC, but EVB Application Note still connect them to somewhere.
And, as I don't have 3.0V regulator, I use 3.3V for the uC for this sensor chip to the symbol 3V0 in the attached schematic, will this be the cause that the chip has neither 1.8V REGOUT nor I2C response?
Does anyone has more up to date materials or information about how to use this chip?
Thanks and best regards,
Hong