3 Proximity Attachment

The proximity attachment has two different parts to it that combine to create a slider. This slider uses friction to stay in place and is a simple tool to showcase how the device performs in a proximity sensing application. Similar to the button attachment, the sliding portion has copper tape placed on it so the attachment can provide a metal target for the coil to sense. The side with the copper tape should be facing towards the sensor coil when the slider is inserted in the housing.

Figure 3-1 Proximity Attachment Slider with Metal Placement

Figure 3-2 Proximity Attachment Housing

Figure 3-3 Proximity Attachment

Similar to the button attachment, the data from the LDC3114 can be viewed through the EVM GUI. In this case, however, the device is put into raw data mode since this is a proximity application. The slider has about 7 mm of motion range from the top of the housing to the lower limit. This full range can cause a large shift in the raw data output as seen in the data graph. This graph shows the data change as the slider starts at the top of the housing, moves to the lowest position, pauses for a small amount of time, and then is returned to the top position.

Figure 3-4 Proximity Attachment Data