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Product List
There are several configuration options in the CS0 module designed to modify the operation of the circuit and address special situations. In particular, any circuit with more than 500Ω of series impedance between the sensor and the device pin may require adjustments for optimal performance. Typical applications which may require adjustments include touch panel sensors fabricated using a resistive conductor such as indium-tin-oxide (ITO) and circuits using a high-value series resistor to isolate the sensor element for high ESD protection. Capacitive sensors created using PCB traces should generally require no fine tuning, and the default settings for CS0DT, CS0DR, CS0IA, CS0RP and CS0LP should be used. CS0 performs a two-stage discharge (double reset) of the external capacitor at the start of every bit conversion to improve performance in high-noise environments. In this method, most of the charge in the external capacitor is removed in a first reset stage through a low-resistance switch to ground. A second reset is then performed using a high-resistance switch to ground. This second reset removes any ambient noise energy that might have been captured in the external capacitor at the end of the first reset stage.
PTM Published on: 2012-05-16
