6.1 Digital Output

The Digital Output option provides a digital signal on the OUT pin that indicates the liquid presence on the connected sensor circuit. This Output mode is enabled by default and operates in Conductive and Capacitive operation modes.

The presence of liquid on the connected sensor circuit in this Output mode is relative to the liquid detection threshold. The delta measurement is obtained by subtracting the reference value from the standard measurement.

The correlation between the voltage level on the OUT pin and the delta measurement is explained in the table below:

Table 6-1. Digital Output
OUT Pin State	Liquid Detection Option	Interpretation
LOW	Not detected	Delta measurement is smaller than the liquid detection threshold
HIGH	Detected	Delta measurement is greater than the liquid detection threshold

If any liquid is detected, the OUT signal will remain in a high state until the Sleep period expires and a new measurement is made. If the next measurement determines that liquid is present, the OUT signal will remain High. Otherwise it will go Low. Below is an example of five consecutive measurements, out of which the first two show liquid was detected. The measurements are separated by the Sleep period.

Figure 6-1. MTCH9010 OUT Pin Signal Example

The OUT pin has an alternate function used when the device enters an Error state. Refer to Error State.