PCAP01 datasheet(49/96 Pages) SCIOSENSE

49 / 96 page

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PCapØ1Ax-0301

4-10

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Figure 4-8: PWM-PDM linearization

By setting the value of m and b, the linearization function limits the range of the output x

as shown. Values outside these limits are ignored. Thereby knowing the range in which the

results might change, the parameters of the linearization function can be fed accordingly.

The lower limit of the valid range corresponds to 0% modulation (all bits are 0), this is the

least possible value of the output (0). The upper limit of the valid range corresponds to

100% modulation (all bits are 1), and this is the maximum possible value of output. 10 bit

resolution implies that this maximum value is 1023. For lower bit resolutions, this

maximum value will come down accordingly. In terms of voltage, the two limits correspond

to 0V and Vdd.

Applications:

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A typical case would be outputting capacitance result through PG0 and temperature

result through PG1. Calculation and copying to the output registers must be

performed by firmware. See help windows in the dedicated PCap01 assembler code

editor.

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Useful for applications for which reading the results out through the SPI/ I2C

interface is not suitable because of speed limitations or applications requiring an

analog output signal.

PCAP01 Folha de dados(PDF) 49 Page - Sciosense B.V.