Keypad comprising keys causing both MCU wake-up and key detection

A keypad comprising:

• a voltage bus configured to distribute power in the keypad;
• a plurality of keys respectively actuable to cause closing of a circuit;
• a plurality of row key connections;
• and
• a plurality of column key connections;
• wherein each key is configured to, when actuated, cause at least one switch to close, causing the voltage bus to be connected to a wake-up control signal point;
• wherein a wake-up signal is activated when connected to the voltage bus, causing a microcontroller to transition from a low-power state to an active state such that the microcontroller can detect which one of the plurality of keys was actuated;
• and
• wherein the keypad keys are provided in a matrix with rows and columns:
• wherein each key is connected to a single row key connection and a single column key connection, such that when actuated, each key provides a connection between a single column key connection and a single row key connection;
• wherein each one of the row key connections and/or each one of the column key connections is provided with a respective port circuit that is configured to connect the key connection with keys of the keypad when the wake-up signal is activated;
• and
• wherein each port circuit comprises a respective port switch that is turned off in the low-power state to disconnect the column key connections or row key connections from the keys of the keypad;
• and
• wherein a low-pass filter is provided between the plurality of keys and the at least one switch.