3.6.1 Operation
Touch detection on a Lump sensor is similar to an ordinary touch button. MTCH2120
provides greater flexibility to users when forming Lump sensors as follows.
- Up to four Lump sensors can be formed
- The Lump sensor can be formed by combining any number of buttons. Refer to note.
- The Same button can be part of more than one Lump button.
Note: The capacitance of the lump button is typically equal
to the sum of the individual button’s capacitance. Lumping too many buttons may
result in higher sensor capacitance, which may not be handled optimally by MTCH2120
- the usage of driven shield+ is advised and very beneficial.
The Lump sensor can be set up as a low-power sensor in scenarios such as a system where two buttons must be scanned in low-power mode. Instead of configuring two individual buttons as low-power sensors, the buttons can be lumped, and the lumped sensor can be configured as a low-power sensor. It is also possible to configure all 12 buttons in four different lump groups and configure the four Lumps as a low-power sensors.