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2.5 Conversion Detail
The SingleTact electronics interface measures the capacitive sensor with 16-bit precision. This is
scaled to a 10-bit digital (2V analog) output using the following calculation:
Figure 8 Digital Output
The digital scaling value is a 16-bit value stored at register locations 10 and 11 (see Table 2). For
increased precision (within a given sensor’s valid operating range) the digital scaling value can be
adjusted in 0.01 increments. A value of 100 represents unity scaling (100 x 0.01).
The internal capacitance to digital converter (CDC) operates at 140 to 4000 Hz depending on the
capacitance sensor settings (in particular the number of accumulations).
Each time the CDC completes a measurement
OVER
PRESSURE
NEGATIVE
PRESSURE
VALID
RANGE
Force or Pressure
Analog Output
0
255
767
1023
FSR
0
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