LIS3DH加速数据解释

我一直在寻找LIS3DH加速度计的数据表和AN3308，希望能找到解释和扩展数据的清晰简洁的解释。
到目前为止，我已经看到（VALUE）*（FS / 2 ^ BIT_RESOLUtiON）直观有意义，但与数据表中提到的灵敏度缩放器不对应：

低功率模式：{2g = 16mg /位，4g = 32mg /位，8g = 64mg /位，16g = 192mg /位}正常功率模式：{2g = 4mg /位，4g = 8mg /位，8g = 16mg /数字，16g = 148mg /数字}
高功率模式：{2g = 1mg /位，4g = 2mg /位，8g = 4mg /位，16g = 12mg /位}
除此之外，我看到有些人说FIFO缓冲区只能达到10位分辨率，这再次与数据表的内容相矛盾。


为了更好地理解我使用AN3308的过程，表8加速数据示例。我研究了+ 350mg和-350mg的例子，他们按预期工作：

-350mg = 0xEA2h - ＆gt;反转 - ＆gt; 0x15Dh - ＆gt; +1 - ＆gt; 0x15Eh = {256 + 64 + 16 + 8 + 4 + 2} x -1 = -350 x 1mg = -350mg
350mg = 350×1mg = 350mg

然而，当使用+ 1g和-1g示例时，这种方法会分崩离析。鉴于数据保持左对齐，我认为值应该是：
-1g =（-1）/ 1mg = -1000 = 0xC18h但是它给出为0xC00h，即-1024。
+ 1g = 1 / 1mg = 1000 = 0x4E8h但是它给出为0x040h，这是64.为了使它全部关闭我已经看到注释表明所需要的是寄存器的移位与位分辨率相关然后简单乘以缩放器，但肯定是两个补码格式，这将导致所有值变为正值，因为MSB现在已经失去了位置？



有没有人对这个过程有任何明确的指示？
#lis3dh #data-scaling＃lis3dh-data-format #data-intepretation



以下为原文




I have been looking over the datasheet and AN3308 for the LIS3DH Accelerometer in the hope that I can find a clear and concise explanation of how to interpret and scale the data.
So far I have seen (VALUE)*(FS/2^BIT_RESOLUTION) which intuitively makes sense but doesn't correspond to the sensitivity scalers mentioned in the datasheet:


Low Power Mode:      { 2g = 16mg/digit, 4g = 32mg/digit, 8g = 64mg/digit, 16g = 192mg/digit }Normal Power Mode: { 2g = 4mg/digit,   4g = 8mg/digit,   8g = 16mg/digit, 16g = 148mg/digit }
High Power Mode:     { 2g = 1mg/digit,   4g = 2mg/digit,   8g = 4mg/digit,   16g = 12mg/digit }
Additionally to this I have seen some people state that the FIFO buffer is only capable of 10 bit resolution, which again contradicts the contents of the datasheets.


In an attempt to better understand the process I have been working with AN3308 Table  8 Example of Acceleration Data. I worked on the +350mg and -350mg examples and they worked as expected:

-350mg = 0xEA2h -> invert -> 0x15Dh -> +1 -> 0x15Eh = {256 + 64 + 16 + 8 + 4 + 2} x -1 = -350 x 1mg = -350mg
350mg = 350 x 1mg = 350mg

However this approach falls apart when working with the +1g and -1g examples. Given the data is held left aligned in two's complement I would have thought the values should have been:
-1g = (-1) / 1mg = -1000 =  0xC18h     BUT it is given as 0xC00h which is -1024.
+1g =   1  / 1mg =  1000 = 0x4E8h      BUT it is given as 0x040h  which is 64.To top it all off I have seen comments which suggest all that is needed is a shift of the register to correlate with the bit resolution and then simply multiply by the scaler, but surely in two's complement format this will result in all values becoming positive because the MSB has now lost its place?



Has anyone got any clear instructions on the process?  
#lis3dh #data-scaling #lis3dh-data-format #data-intepretation