AN3308 datasheet(18/52 Pages) STMICROELECTRONICS

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Interrupt generation

AN3308

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Doc ID 18198 Rev 1

Interrupt generation

The LIS3DH interrupts signal can behave as free-fall, wake-up, 6D and 4D orientation

detection, and click detection. Those signals can be driven to the two interrupt pins (INT1

and INT2).

5.1

Interrupt pin configuration

The device is provided with two pins which can be activated to generate either the data-

ready or the interrupt signals. The functionality of the pins is selected through

CTRL_REG3(22h) and CTRL_REG6(25h). Refer to Table 10 and Table 11 and to the block

diagram given in Figure 6.

Table 10.

CTRL_REG3 register

I1_CLICK

I1_INT1

I1_DRDY1

I1_WTM

I1_OVERRUN

Table 11.

CTRL_REG3 description

I1_CLICK

CLICK interrupt on INT1. Default value 0.

(0: disable; 1: enable)

I1_INT1

Interrupt generator 1 on INT1 pin. Default value 0.

(0: disable; 1: enable)

I1_DRDY1

DRDY1 interrupt on INT1. Default value 0.

(0: disable; 1: enable)

I1_WTM

FIFO watermark interrupt on INT1. Default value 0.

(0: disable; 1: enable)

I1_OVERRUN

FIFO overrun interrupt on INT1. Default value 0.

(0: disable; 1: enable)

Table 12.

CTRL_REG6 register

I2_CLICKen

I2_INT1

BOOT_I2

H_LACTIVE

Table 13.

CTRL_REG6 register

I2_CLICKen

CLICK interrupt on INT2. Default value 0.

(0: disable; 1: enable)

I2_INT2

Interrupt generator 1 on INT2 pin. Default value 0.

(0: disable; 1: enable)

BOOT_I2

BOOT status on INT2. Default value 0.

(0: disable; 1: enable)

HL_ACTIVE

0: interrupt active high; 1: interrupt active low

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