Custom MPU9250 Circuit problem

Hi! I've design a MPU9250 schematic for a project. But it's not working, I even can't find it with a I2C scanner code. And I think the soildering is fine (I had re-soilder many times)

I just connect the SDA, SCL connect to my ESP32 SDA, SCL pin with 2.2k pull up. VCC is in 3V3 as normal

Do anyone know what I've done wrong ? Thank you!

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javagoza over 2 years ago in reply to Gough Lui +2

You're right, I'm totally asleep, I'm going for a coffee :D
Gough Lui over 2 years ago +1

It looks mostly fine to me. You might have to scope the I2C pins and check power - sometimes they can get unhappy if the power supply is non monotonic, noisy or has dips. Design wise, Pin 11 FSYNC should…

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javagoza over 2 years ago

Both signal lines, SDA and SCL, need a pull-up resistor on them, to restore the signal to high when no device is asserting it low.
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Gough Lui over 2 years ago in reply to javagoza

Poster claims 2.2k resistance for pull up in original posting. PCB layout R5 and R6 appear to do this, good for 400kHz mode. That being said, the routing is a bit strange ...

- Gough
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Gough Lui over 2 years ago in reply to javagoza

Poster claims 2.2k resistance for pull up in original posting. PCB layout R5 and R6 appear to do this, good for 400kHz mode. That being said, the routing is a bit strange ...

- Gough
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javagoza over 2 years ago in reply to Gough Lui

You're right, I'm totally asleep, I'm going for a coffee :D
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