Hi,
I would like to know how to raplace a MPU-9250 chip with ICM-20948 in a Thingy:52 circuit.
Let me first state that my electronics engineering knowledge is at hobby level at best. I am currently using a Thingy:52 for my project and got it this far that I want to make my own board now with reduced footprint and most of the sensors removed.
To give myself the best chance of making my board work I copied the Thingy design but I removed everything but:
- NRF52832 chip
- MPU-9250 accelerometer
- Low power accelerometer
- I2C chip
- power circuit
- programming pins
- single color LED
As MPU-9250 chip is deprecated and a bit harder to get I would like to replace it with the ICM-20948 chip. I read the migration guide: http://www.invensense.com/wp-content/uploads/2018/10/AN-000146-v2.0-TDK_Migration_MPU_9250toICM-20948.pdf and it says that the new chip is basically a drop in replacement only the voltage has to be lower at arround 1.8V.
I would like to know:
- Could the new chip be replaced without doing anything? - I believe the voltage on Thingy is 3.3V so probably not - is that correct?
- I believe I read that the minimal operating voltage for NRF52832 is 1.7V - could the entire voltage of the Thingy or Thingy like IC be changed to 1.7V - if yes how and what would be implications of that?
- How can the voltage be adjusted just for the new ICM-20948 chip?
Thanks!
Matej
