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LIS2DE12 Interrupt on INT2 pad

Question asked by Fahad Mirza on Nov 17, 2017
Latest reply on Nov 21, 2017 by Fahad Mirza

I am unable to generate an interrupt on INT2 pin. But I can generate an interrupt with the same configuration on INT1 pin. Seems like I am missing something obvious or the datasheet is missing something crucial!!

 

I am trying to detect a 180-degree flip from Z-axis. On a flat surface, Z-axis pointing upwards gives me approx +1g (decimal 65 with FS = 2). 180 flip will give me a negative value. Here is the configuration that worked on INT1 pin.

 

  • CTRL_REG1 = 0x5F  // ODR = 100Hz, LPen = 1, All axis enabled
  • CTRL_REG2 = 0x42  // Reference filtering, Filter data for AOI function on interrupt 2
  • REFERENCE = 50     // Taking the z-axis value close to 15
  • CTRL_REG3 = 0x20  // IA2 interrupt on INT1
  • CTRL_REG5 = 0x08 // Latch for INT1
  • CTRL_REG6 = 0
  • INT2_THS = 100 // A 180-degree flip gives me around -112 with REFERENCE 50
  • INT2_DURATION = 50 // 500ms with ODR=100Hz
  • INT2_CFG = 0x20 // Interrupt enable for High on Z-axis

 

With above configuration, I can detect the interrupt on INT1 pin. For INT2 pin I changed,

 

  • CTRL_REG3 = 0
  • CTRL_REG5 = 0x02 // Latch for INT2
  • CTRL_REG6 = 0x20 // IA2 interrupt on INT2 pin

 

...and I don't receive any interrupt. I just redirected the pin. This should work. Unless I am missing something obvious. Any help will be much appreciated.

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