LIS3DH碰撞检测部分阈值非常高

大家好
我的目标是使用两个INT引脚在一个将用于汽车的设备中生成两个中断。检测到汽车碰撞时会拉动INT2，汽车移动时会拉动INT1。
这是我的初始设置：
CTRL_REG1 = 0x27 // 10Hz，正常功耗模式，ZXY使能
CTRL_REG2 = 0x01 // INT1的HP过滤器
CTRL_REG3 = 0x40 // IA1启用
CTRL_REG4 = 0x90 // 4g | BDU
CTRL_REG5 = 0x0A //锁存在INT1和INT2上
CTRL_REG6 = 0x22 //低电平有效INT2启用
INT2_THS = 0x6D //~3500mg
INT2_DURAtiON = 0x00 // 0.1 * 0s
INT2_CFG = 0x2A // OR，X，Y，Z高于阈值
INT1_THS = 0x02 //
INT1_DURATION = 0x03 //
INT1_CFG = 0x2A //
通常，运动检测部分工作正常（感谢Miroslav）。我担心碰撞检测部分。阈值非常高（我不希望它在路上的每个碰撞中断）但是当没有应用高速加速时它仍然有时会中断。这是非常罕见但仍然会发生。

如果您对此有任何意见，我将不胜感激。



以下为原文




Hello all
My goal is to use two INT pins to generate two interrupts in a device which will be used in a car. INT2 will be pulled when a crash of the car is detected and INT1 when the car moves.
Here is my init setting:

CTRL_REG1 = 0x27 //10Hz, normal power mode, ZXY enable


CTRL_REG2 = 0x01 // HP filter for INT1


CTRL_REG3 = 0x40 //IA1 enable


CTRL_REG4 = 0x90 //4g | BDU


CTRL_REG5 = 0x0A //latch on INT1 and INT2


CTRL_REG6 = 0x22 //active low & INT2 enable


INT2_THS     = 0x6D //~3500mg


INT2_DURATION = 0x00 // 0.1*0s


INT2_CFG     = 0x2A  //OR, X,Y,Z higher than threshold


INT1_THS     = 0x02 //


INT1_DURATION = 0x03 //


INT1_CFG    = 0x2A //


Generally, the motion detection part works fine (thanks to Miroslav). I am concerned about the crash detection part.The threshold is quite high (I don't want it to interrupt on every bump on the road) but it still sometimes interrupts when no hight acceleration is applied. It is very rare but still occurs.





If you have any inputs to this I'll appreciate.