I have this Capacitive Sensor IC
I am trying to understand and analyze how to use this IC.
In the datasheet, on page 13 - Function description, it is mentioned as "There are four selectable non-harmonic sensor frequencies for generating the sensor driver output signal: 45.45 kHz, 71.43 kHz, 100 kHz and 125 kHz. This can be set in FREQ register (see 7.2.7)"
I am not able to understand the purpose of this frequency in the IC? For what purpose is the frequency?
Like, is this the frequency for the IC internal working derived from the CLK input from the Host or does this frequency available on any other pin of the which (like, can this frequency be measured external to the IC?)
My questions :
What does the frequency setting serve as? What is its purpose? From which section in the block diagram is this frequency generated from?
I couldn't find the "Sensor driver output" block on the block diagram? What is the sensor driver output and what does it do?