How do I connect the ICM-20948 to an ESP32 PICO D4?

Hello everyone, I am trying to add this ICM-20948 (data sheet- https://product.tdk.com/system/file...l/imu/data_sheet/ds-000189-icm-20948-v1.3.pdf). I am just a beginner at this, not sure wether I have connected it correctly.

I am trying to use the I2C connection with this to my esp32 pico d4, but not sure wether I have connected it correctly, hence I have not connected the SDA and SCL to the MCU. I am getting confused with the SDO/ADO, SDA/SDI, SCL/SCLK pins. I have shared my schematic down below. Which do I use for a standard I2C connection?

Thanks a lot for your help!

Attachments:

Accelerometer & Gyro.pdf

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fmilburn over 4 years ago +3

Hi, The pinout for the ICM-20498 in I2C configuration is shown in Figure 4a on page 20 of the datasheet you linked. SDA and SCL are clearly marked. ADO is used to set the LSB to avoid address conflicts…

fmilburn over 4 years ago

Hi,
The pinout for the ICM-20498 in I2C configuration is shown in Figure 4a on page 20 of the datasheet you linked. SDA and SCL are clearly marked. ADO is used to set the LSB to avoid address conflicts. On the ESP32 the pins are not so clearly marked, but on the board I have used SDA is IO21 and SCL is IO22.
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s_f1 over 4 years ago in reply to fmilburn

Thanks a lot Frank Milburn, I assume that the SDO/ADO are the same, and they aren't different from one another. And they need to be connected to the MCU right? Also I would like to ask, is my circuit right? Have I connected it the right way?
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fmilburn over 4 years ago in reply to s_f1

I lack familiarity with the ICM-20498 so can't give you informed answers on using the chip. My approach would be to understand the datasheet and then look for a working schematic in the TDK technical support or from a trusted open source vendor. I did a quick google and both SparkFun SparkFun_IMU_Breakout_ICM-20948.sch and Adafruit make breakout boards sensors_image.png (9258×6378) (adafruit.com). You can see their schematics, layouts, and even get working code by examining what they did. If things get really difficult I would look for help in TDK technical support.

ADO sets the LSB for the I2C address in that mode - see section 6.2 of the datasheet and should be tied to logic high or to GND, not the MCU. It looks like SparkFun ties theirs to GND and Adafruit to 1.8V.
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s_f1 over 4 years ago in reply to fmilburn

Sure Frank, Thanks for your help! I see that sparkfun happens to use level shifting for I2C mode, is it necessary that I also implement it in my design too? Can it be done without the level shifting?
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fmilburn over 4 years ago in reply to s_f1

See section 3.7 of the datasheet for maximum ratings. It says SCL and SDA can be up to +0.5V above VDD but those are maximum stress ratings and not operating recommendations. Section 3.4 gives operating values but I don't see a maximum digital high. But they do say "Typical Operating Circuit of section 4.2, VDD = 1.8V, VDDIO = 1.8V" which is what SparkFun and Adafruit use and this would require level shifting from a 3.3V microcontroller. I would stick with the typical operating circuit or check with TDK.

EDIT: Not an expert :-)
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s_f1 over 4 years ago in reply to fmilburn

Sure Frank, Thanks for your help!
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