MPL3115A2

sergiogianti — Tue, 03 Feb 2026 22:49:39 GMT

i hope some one can help me, i try to use this sensor with STM32F051, after i send the data for configurate the sensor i try to read WHO_IM but i didn't receive the correct answer, i configurate int1 output pull up and then interrupt is generate on the falling edge, and i can see with my logic analyzer he work. I really don't understand why i receive the wrong data. I hope some one can help me

Thank you

Sergio:smileycry:

Re: MPL3115A2

TomasVaverka — Tue, 22 Mar 2016 08:48:29 GMT

Hi Sergio,

Could you please post here the waveforms to review what is going on the I²C bus?

A single byte read from the WHO_AM_I register (0x0C) should look like this:

And here is a burst read of 5 bytes from registers 0x01 to 0x05. It also shows how the INT1 pin is automatically deasserted by reading the output data registers.

You might find useful my simple example code for the MPL3115A2 that is published here.

I hope it helps.

Regards,

Tomas

PS: If my answer helps to solve your question, please mark it as "Correct". Thank you.

Re: MPL3115A2

sergiogianti — Tue, 22 Mar 2016 12:15:55 GMT

Hi Tomas,i have a problem to post the waveform, i follow your code but still the problem. One question for you but you use the dummy read ? and if yes can you help me because i don't understand how really work. When i try to read the data (right now i just try WHO_IM) the answer is the same 0XEE without use interrupt , i really don't understand

Thank youSergio

Messaggio originale----

Da: admin@community.freescale.com

Data: 22-mar-2016 9.49

A: "Sergio Gianti"<sergiogiovanni.gianti@tin.it>

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MPL3115A2

reply from Tomas Vaverka in Sensors - View the full discussion

Hi Sergio,

Could you please post here the waveforms to review what is going on the I2C bus?

A single byte read from the WHO_AM_I register (0x0C) should look like this:

And here is a burst read of 5 bytes from registers 0x01 to 0x05. It also shows how the INT1 pin is automatically deasserted by reading the output data registers.

You might find useful my simple example code for the MPL3115A2 that is published here.

I hope it helps.

Regards,

Tomas

PS: If my answer helps to solve your question, please mark it as "Correct". Thank you.

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