Datasheet

Channel 0
Channel 1
Channel 0
Sensor
Activation
Channel 0
Conversion
Channel 1
Sensor
Activation
Channel 1
Conversion
Channel 0
Sensor
Activation
Channel
switch delay
Channel
switch delay
Target Distance D (mm)
Sensor Frequency (MHz)
Inductance (µH)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
1 6
1.5 9
2 12
2.5 15
3 18
3.5 21
4 24
Target D = 0.5 x coil ‡ Target D = 1 x coil ‡
D011
Sensor Frequency (MHz)
Inductance (µH)
37
LDC1612 , LDC1614
www.ti.com SNOSCY9A –DECEMBER 2014–REVISED MARCH 2018
Product Folder Links: LDC1612 LDC1614
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Application Information (continued)
Figure 52. Example Sensor Frequency, Inductance vs. Target Distance
with 14 mm PCB Coil and 1.5 mm Thick Aluminum Target
The Texas Instruments Application Notes LDC Sensor Design and LDC Target Design provide more information
on construction of sensors and targets charactersitics to consider based on system requirements.
8.1.3 Multi-Channel and Single Channel Operation
The multi-channel package of the LDC enables the user to save board space and support flexible system design.
For example, temperature drift can often cause a shift in component values, resulting in a shift in resonant
frequency of the sensor. Using a second sensor as a reference or in a differential configuration provides the
capability to cancel out temperature shifts and other environmental variations. When operated in multi-channel
mode, the LDC sequentially samples the selected channels - only one channel is active at any time while the
other selected channels are held in an inactive state. In single channel mode, the LDC samples a single channel,
which is selectable. Refer to Inactive Channel Sensor Connections for more details on inactive channels.
Inactive channels have the corresponding INAx and INBx pins tied to ground. The following table shows the
registers and values that are used to configure either multi-channel or single channel modes.
Figure 53. Multi-Channel Mode Sequencing