LC717A10PJ

No.A2214-6/14

Dynamic offset calibration function to correct Cin offset drift

When measurement data at a certain channel are consecutively within the execution range of dynamic offset

calibration (4 to touch threshold, or -128 to -4) for the period of time corresponding to a value, dynamic offset

calibration is performed and the reference value at the channel is gradually corrected to 0.

The figure below shows the operation when the measured value began to drift in the positive

direction from the central value gradually.

The examples of setting to 8 times the dynamic offset calibration carried count.

CinX Threshold

4

0

Execution Range of

Dynamic Offset Calibration

(Positive range)

t

123

45678

0

0

= 0x01

Dynamic Offset Calibration

Execution Count Number

(Positive range)

Measurement Time + Long Interval Time [ms]

0

Dynamic OffCal

Count Plus Register

Measurement Timing

Dynamic Offset

Calibration

Judgment points (They means measurement points where the LC717A10

judges whether to perform dynamic offset calibration

All other measurement points other than the above

Judgment points within the execution range of dynamic offset calibration