How to use LPF and HPF simultaneously on LSM6DSL accelerometer

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Hi,
I’m working with the LSM6DSL sensor and I’d like to know if it’s possible to use both the Low-Pass Filter (LPF) and High-Pass Filter (HPF) at the same time in the accelerometer. If so, could someone explain how to configure it?

Thanks!

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Federica BossiBest answer

ST Technical Moderator

Hi @JeongHoYong ,

To properly configure the LSM6DSL sensor, the following registers need to be set:

CTRL8_XL (17h)
This register controls the high-pass path filter.
The bandwidth column depends on the value of HPCF_XL[1:0]:
- If HPCF_XL[1:0] = 00, the bandwidth relates to the slope filter.
- If HPCF_XL[1:0] = 01, 10, or 11, the bandwidth refers to the high-pass (HP) filter.
CTRL1_XL (10h)
This register is used to set the Output Data Rate (ODR), Full Scale range, and the LPF1 (Low Pass Filter 1).
Enabling the second LPF
If you want to add a second low-pass filter, you can enable it via the CTRL8_XL (17h) register.

To review the possible values and configurations, please refer to the official sensor page:
LSM6DSL - STMicroelectronics

Specifically, in the datasheet, refer to:

Chapters 9.13 and 9.20 for detailed register characteristics
Section 5.4.2 for the sensor block diagram

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