IIS3DWBTR I2C address with SA0 high or low. I didn't see this in the datasheet.

[Tesla DeLorean · Accepted solution]

1101010x for SA0=0 (0x6A << 1)

1101011x for SA0=1 (0x6B << 1)

[JLee.75]

Thank you, did I miss this in the datasheet?

[Tesla DeLorean]

The low order bit was mentioned several times, the actual address pattern wasn't, even in things like the timing diagram

https://github.com/STMicroelectronics/iis3dwb-pid/blob/master/iis3dwb_reg.h

@Amel NASRI​ can we flag the data sheet issue to the technical writers, thanks

[Amel NASRI]

Hi @Community member​ ,

I let @Eleon BORLINI​  take care of this request.

-Amel

[Eleon BORLINI]

Hi,

let me add that, for IIS3DWB, the SPI communication protocol is recommended, especially if the device is configured in 3-axis mode, since the ODR is fixed at 26.67kHz and is quite high for a sensor.

Anyway, I'll notify this missing info to our technical writers team.

-Eleon

[Tesla DeLorean]

Understood, playing devils advocate here.

Data sheet lacks detail on I2C speed supported too, so 400 KHz, or 1 MHz ?

A table of anticipated bandwidths may make the I2C vs SPI case more strongly.

I think @JLee had a different question/thread, where it's a sub-set of functionality, or triggering, that's desired.

https://www.st.com/resource/en/datasheet/iis3dwb.pdf

[JLee.75]

But as I mentioned in my other post and repeated here, I don't care about getting the data out at high sample rates. I'm just using the interrupts for thresholds and want to use this part because it has a higher bandwidth for detection.

In I2C mode for the IIS3DWB device the datasheet says it only support single axis mode because I2C is too slow to get the data. I want to use I2C mode to configure either wake up or activity thresholds for all 3 axis and then configure the interrupts to tell me those thresholds were exceeded. I don't need the data.

So the questions are In I2C mode:

1. Are all the axes still active?
2. Can I access all the registers in I2C mode to configure the thresholds for all axes of the device for the interrupts?
3. Can I effectively get two thresholds for each axis if I use one set of thresholds for wake up configured on INT1 pin and another set of thresholds for activity configured on INT2 pin?