Datasheet

LDC1000
SNOSCX2 –SEPTEMBER 2013 www.ti.com
Table 8. Register Settings for Rp_MIN
Register setting Rp (kΩ)
0x20 3926.991
0x21 3141.593
0x22 2243.995
0x23 1745.329
0x24 1308.997
0x25 981.748
0x26 747.998
0x27 581.776
0x28 436.332
0x29 349.066
0x2A 249.333
0x2B 193.926
0x2C 145.444
0x2D 109.083
0x2E 83.111
0x2F 64.642
0x30 48.481
0x31 38.785
0x32 27.704
0x33 21.547
0x34 16.160
0x35 12.120
0x36 9.235
0x37 7.182
0x38 5.387
0x39 4.309
0x3A 3.078
0x3B 2.394
0x3C 1.796
0x3D 1.347
0x3E 1.026
0x3F 0.798
Table 9. Sensor Frequency
(1)(2)
Address = 0x03, Default=0x45, Direction=R/W
Bit Field Field Name Description
7:0 Min Resonating Frequency Sets the minimum resonating frequency to approximately 20% below the
lowest resonating frequency of the sensor with no target in front. Use the
formula below to determine the value of register.
(1) N = 68.94 * log
10
(F/2000)
F = 20% below resonating frequency, Hz
N = Register Value. Round to nearest value.
(2) Example:
Sensor Frequency: 1MHz
F = 0.8*1Mhz=800Khz
N = 68.94 * log
10
(800KHz/2000)= Round to nearest(179.38)=179 (Value to be programmed in Sensor Frequency register)
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