Maxim’s MAX1441 proximity and touch sensor IC is designed for capacitive proximity sensing in automotive passive remote keyless entry (PRKE) and other applications.
It provides signal processing to support two independent touch/proximity sensor channels and features two open-drain output pins with high-voltage capability up to 28 V, as well as five digital I/Os to indicate sensing events.
The device uses grounded electrode capacitive sensing to measure capacitance between one of the two sense pins and ground. A hand approaching a sense electrode attached to these sense pins causes a change in measured capacitance indicating the presence (touch or proximity) of the object. Active guard outputs shield the sense electrode from unwanted sources without adding parasitic capacitance. Spread-spectrum techniques in the sensor excitation circuit reduce both electromagnetic emissions and susceptibility to interfering signals. In addition, the sensing excitation frequency is programmable from 100 kHz to 500 kHz in 10 kHz steps to avoid interference.
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