Datasheet

Target Distance / ‡
SENSOR
Measurement Precision (µm)
10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
D022
Target Distance D (mm)
DATA_CH0
0 5 10 15 20 25 30
1.2E+7
1.4E+7
1.6E+7
1.8E+7
2E+7
2.2E+7
2.4E+7
Target D = 1 x coil ‡ Target D = 2 x coil ‡
D014
Target Distance / ‡
SENSOR
Measurement Precision (µm)
0 40% 80% 120% 160% 200%
0
20
40
60
80
100
120
140
160
Target D = 1 x coil ‡
Target D = 2 x coil ‡
D021
Ref Count = 0xFFFF
Ref Count = 0x0FFF
Ref Count = 0x00FF
Ref Count = 0x000F
Ref Count = 0x0004
52
LDC1612 , LDC1614
SNOSCY9A –DECEMBER 2014–REVISED MARCH 2018 www.ti.com
Product Folder Links: LDC1612 LDC1614
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8.2.6 Application Curves
Common Test Conditions (unless specified otherwise):
• Sensor inductor: 2 layer, 32 turns/layer, 14mm diameter, PCB inductor with L=19.4 µH, R
P
=5.7 kΩ at 2 MHz
• Sensor capacitor: 330 pF 1% COG/NP0
• Target: Aluminum, 1.5 mm thickness
• Channel = Channel 0 (continuous mode)
• ƒ
CLKIN
= 40 MHz, FIN_DIVIDERx = 0x01, FREF_DIVIDERx = 0x001
• RCOUNT0 = 0xFFFF, SETTLECOUNT0 = 0x0100
• RP_OVERRIDE = 1, AUTO_AMP_DIS = 1, DRIVE_CURRENT0 = 0x9800
Figure 60. Output Code vs. Target Distance (0 to 30mm) Figure 61. Measurement Precision in Distance vs. Target
Distance (0 to 30mm)
Figure 62. Measurement Precision in Distance vs. Target Distance (0 to 10mm)