AN3308 datasheet(16/52 Pages) STMICROELECTRONICS

Part #	AN3308

Description	This document describes the low-voltage 3-axis digital output linear MEMS accelerometer provided in an LGA package

PDF	52 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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High-pass filter

AN3308

16/52

Doc ID 18198 Rev 1

4.1.1

Normal mode

In this configuration the high-pass filter can be reset reading the reference register, instantly

deleting the DC component of the acceleration.

Figure 3.

HP_FILTER_RESET readings

4.1.2

Reference mode

In this configuration the output data is calculated as the difference between the input

acceleration and the content of the reference register. This register is in 2’ complement

representation and the value of 1 LSB of these 7-bit registers depends on the selected full

scale (Table 9).

Table 8.

Low power mode - high-pass filter cut-off frequency [Hz]

HPC

ft [Hz]

@ 1Hz

ft [Hz]

@ 10Hz

ft [Hz]

@ 25Hz

ft [Hz]

@ 50Hz

ft [Hz]

100Hz

ft [Hz]

200Hz

ft [Hz]

400Hz

ft [Hz]

@ 1.6

kHz

ft [Hz]

@ 5 kHz

0.02

0.2

0.5

100

0.008

0.08

0.2

0.5

0.004

0.04

0.1

0.2

0.5

0.002

0.02

0.05

0.1

0.2

0.5

Table 9.

Reference mode LSB value

Full scale

Reference mode LSB value (mg)

2~16

4~31

8~63

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