LIS331HH datasheet(26/37 Pages) STMICROELECTRONICS

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LIS331HH

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Doc ID 16366 Rev 1

inside corresponding internal registers and it is used to calibrate the device. These values

are factory trimmed and they are different for every accelerometer. They permit a good

behavior of the device and normally they have not to be changed. At the end of the boot

process the BOOT bit is set again to ‘0’.

HPCF[1:0]. These bits are used to configure high-pass filter cut-off frequency ft which is

given by:

The equation can be simplified to the following approximated equation:

7.3

CTRL_REG3 [Interrupt CTRL register] (22h)

Table 22.

High-pass filter mode configuration

HPM1

HPM0

High-pass filter mode

Normal mode (reset reading HP_RESET_FILTER)

Reference signal for filtering

Normal mode (reset reading HP_RESET_FILTER)

Table 23.

High-pass filter cut-off frequency configuration

HPcoeff2,1

ft [Hz]

Data rate = 50 Hz

ft [Hz]

Data rate = 100 Hz

ft [Hz]

Data rate = 400 Hz

ft [Hz]

Data rate = 1000 Hz

0.5

0.25

0.5

0.125

0.25

2.5

HPc

------------

–

⎝⎠

⎛⎞

------

⋅

6HPc

⋅

----------------------

Table 24.

CTRL_REG3 register

IHL

PP_OD

LIR2

I2_CFG1

I2_CFG0

LIR1

I1_CFG1

I1_CFG0

Table 25.

CTRL_REG3 description

IHL

Interrupt active high, low. Default value: 0

(0: active high; 1:active low)

PP_OD

Push-pull/Open drain selection on interrupt pad. Default value 0.

(0: push-pull; 1: open drain)

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