LIS2DH12 data rate

[MykolaLevun]

Hello,

LIS2DH12 accelerometer. Datasheet AN5005 shows Table 4.

Is this the speed of data transfer via the SPI or I2C interface? Or the speed of converting data into accelerations and writing this accelerations to the OUTX_H and OUTX_L registers?

[Federica Bossi]

Hi @MykolaLevun ,

 

It is the output data rate, the rate at which a sensor obtains new samples.

[Andrew Neil]

The Datasheet never once gives the meaning of the "ODR" abbreviation.

The Application Note uses it four times before finally mentioning the meaning on page 9 - and that's just in passing:

Even that's not very clear: it could be bits per second, bytes per second, etc, ...

 

[Andrew Neil]

---

@MykolaLevun wrote:

Hello,

LIS2DH12 accelerometer. Datasheet AN5005 shows Table 4.

---

That's an Application Note - not the Datasheet.

The Datasheet is https://www.st.com/resource/en/datasheet/lis2dh12.pdf

 

[Federica Bossi]

Hi @Andrew Neil ,

 

As in the screenshot posted by @MykolaLevun the unit of the ODR is Hz.

[Andrew Neil]

But "Hz" really doesn't help - it could still mean bits per second, bytes per second, etc, ...

[Federica Bossi]

Hi @Andrew Neil ,

As written before, ODR is output data rate and thus the unit is samples/s where samples means the output value of the sensor stored in the output register.

[Andrew Neil]

Yes, you know that and I know that - but the documentation does not make that clear at all.

And that's why @MykolaLevun is here asking the question.

When I first started with this kind of thing, I remember being uncertain whether it was the rate of (x,y,z) triplets, or just the total rate of data (bytes/s).

 

Addendum

There's also Application Note AN4508, "Parameters and calibration of a low-g 3-axis accelerometer"

It has a 'Terminology' section, but still doesn't make it clear:

 

[Federica Bossi]

Hi @Andrew Neil ,

Thank you for the suggestion, I will pass it on to the team for improvement in the future. In the meantime, I hope I have answered @MykolaLevun 's question.