IIM-42652 anti-alias filter bandwitdh

By mgigantezerynthcom , 10 July 2023

Hello,
I'm using the IIM-42652 for acceleration monitoring and I wanted to enable the AAF for low frequencies. In the section "5.3 Anti-Alias Filter" of the datasheet there is a table for 3dB bandwidth settings ranging from 42 to 3979 Hz.
While from the "3.2 ACCELEROMETER SPECIFICATIONS" I see that for ODR <= 1Khz the "Low-Pass filter response" range goes from 5 to 500 Hz.
Is there any table for register settings for the 5-500Hz range?

jayminshah1tdkcom

2 years 8 months ago

Hi
For low pass filter setting look at GYRO_ACCEL_CONFIG0 register in section 14.4 of datasheet

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mgigantezerynthcom

2 years 8 months ago

Hi
The GYRO_ACCEL_CONFIG0 register looks related to UI filter to me, and not the Anti-alias one. I also guess you meant the section of 14.40, right? (just to be sure I have the right datasheet).

I am interested in the following registers: ACCEL_CONFIG_STATIC2, ACCEL_CONFIG_STATIC3, ACCEL_CONFIG_STATIC4
described in the sections 5.3, 16.1, 16.2, 16.3

The section 5.3 reports a table for the 42Hz - 3979Hz range.
-> I'd need the values for the 5Hz - 500Hz range. <-

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mustafayildiri…

2 years 7 months ago

Hello,

If it is not reported on datasheet, it might not be available. Let me check that out.

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mgigantezerynthcom

2 years 6 months ago

Hello Mustafa,
did you find anything?

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mustafayildiri…

2 years 6 months ago

Hi,

You need to use UI filter below 42Hz. AAF is not suitable.

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mgigantezerynthcom

2 years 6 months ago

Hi,
thank you very much for the feedback!

So, the datasheet should be updated. The section ā€œ3.2 ACCELEROMETER SPECIFICATIONSā€ contains wrong information. See my initial post and the relevant screenshots.

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