LIS3DH SA0引脚连接

你好，先生，
我正在使用ST加速度计传感器LIS3DH（适配器板STEVAL-MKI105V1）。
从数据表'DS6839_MEMS数字输出运动传感器_超低功耗高性能3轴'纳米加速度计'，
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6.1.1 I2C操作
'与LIS3DH相关的从属地址（SAD）为001100xb。 SDO / SA0焊盘可用于修改器件地址的低有效位。如果SA0焊盘连接到电源，则LSb为“1”（地址0011001b），否则如果SA0焊盘接地，则LSb值为“0”（地址0011000b）。该解决方案允许将两个不同的加速度计连接并寻址到相同的I2C线路。 “
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我的问题：

对于SA0 PIN，我们可以免费使用吗？也就是说，SA0 PIN无需连接到电源，NOR连接到地。
我用万用表测试了SA0 PIN，它在浮动时有电压。谢谢，
阿娜李



以下为原文




Hi Sir,
I am using ST accelerometer Sensor  LIS3DH (adapter board STEVAL-MKI105V1).
From the data sheet 'DS6839_MEMS digital output motion sensor_ultra-low-power high-performance 3-axis “nano� accelerometer',
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6.1.1 I2C operation
'The Slave ADdress (SAD) associated to the LIS3DH is 001100xb. The SDO/SA0 pad can be used to modify the less significant bit of the device address. If the SA0 pad is connected to the voltage supply, LSb is ‘1’ (address 0011001b) else if SA0 pad is connected to ground, the LSb value is ‘0’ (address 0011000b). This solution permits to connect and address two different accelerometers to the same I2C lines. '
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My question:

For SA0 PIN, can we let it free? That is, SA0 PIN is NEITHER connected to the voltage supply, NOR connected to ground.
I tested the SA0 PIN with multimeter and it has voltage when it is floating. Thanks,
Arna Lee