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What causes a PCF8883 lock up state (output continuously high)?

Question asked by Stephen Thompson on Oct 7, 2016
Latest reply on Oct 28, 2016 by David Diaz Marin

We are using the PCF8883 capacitive sensor and have been experiencing a lock up state I couldn't find mentioned in the datasheet/app note. If the sensitivity of CPC is set closer to the upper limits or the sampling frequency is increased, the sensor can be put in a state where a sense event triggers and the output remains high forever after. The type pin is grounded (pushbutton mode), but the capacitive event should clear when your hand is pulled away. This lock up does not occur with middle range CPC and CLIN values. We are trying to push the sensing distance out as far as possible, so there may be an increased susceptibility to noise, but it only seems to lock after a sense trigger. I am just wondering if anyone knows what might be the root cause.