The threshold level for interrupt generation can be programmed by setting the THRES_COMP register. The threshold level settings can be set for each individual input groups and each group consists of 4 inputs. Four threshold levels are available: 2 V, 2.7 V, 3 V, and 4 V.

Remember to use caution when setting up the threshold for switches that are connected externally to the battery as there is a finite voltage drop (as high as V_{CSI_DROP_OPEN} for 10mA and 15mA settings) across the current sinks. Therefore, even for an open switch, then voltage on the INx pin can be as high as V_{CSI_DROP_OPEN} and the detection threshold shall be configured above it. It shall also be noted that a lower wetting current sink setting may not be strong enough to pull the INx pin close to ground in the presence of a leaky open external switch, as illustrated in the diagram below (see Figure 8-3). In this example, the external switch, although in the open state, has large leakage current and can be modelled as an equivalent resistor (R_DIRT) of 5kΩ. The 2mA current sink is only able to pull the INx pin voltage down to 4 V, even if the switch is in the open state.

Figure 8-3 Example Showing The Calculation of The INx Pin Voltage For A Leaky Battery-Connected Switch