How to use LPF and HPF simultaneously on LSM6DSL accelerometer

[JeongHoYong]

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!

[Federica Bossi]

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