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Scan IF Operation
24-29Scan IF
24.2.6.1 LC-Sensor Oscillation Test
The oscillation test tests if the amplitude of the oscillation after sensor
excitation is above a reference level. The DAC is used to set the reference
level for the comparator, and the comparator detects if the LC sensor
oscillations are above or below the reference level. If the oscillations are above
the reference level, the comparator will output a pulse train corresponding to
the oscillations and the selected AFE output bit will 1. The measurement timing
and reference level depend on the sensors and the system and should be
chosen such that the difference between the damped and the un-damped
amplitude is maximized. Figure 24−15 shows the connections for the
oscillation test.
Figure 24−15. LC Sensor Connections For The Oscillation Test
Power
Supply
Terminals
SIFCI0
SIFCI
SIFCI1
SIFCI2
SIFCI3
470nF
AV
CC
DV
CC
DV
SS
AV
SS
SIFVSS
470 nF
SIFCOM
SIFCH1
SIFCH0
SIFCH2
SIFCH3