Key matrix circuit device and input device

An input device, comprising:

• an operation panel having a plurality of operation units;
• and
• a key matrix circuit device, wherein
• the key matrix circuit device includes
• a key matrix having a plurality of scan terminals, a plurality of sense terminals, a plurality of switches that are connected between the plurality of scan terminals and the plurality of sense terminals and that are arranged in a matrix, and a plurality of voltage dividing resistors connected between the plurality of sense terminals and the plurality of switches, and
• a wake-up circuit having an output terminal that outputs a switch signal that causes a switch unit to switch a mode of an information processing apparatus to a power-saving mode or a normal mode, a power source terminal connected to a power source, and a connection terminal connected to the power source terminal and the plurality of scan terminals,
• the plurality of voltage dividing resistors have respective resistance values that make voltages of the plurality of sense terminals connected to respective sense ports of the information processing apparatus to a predetermined voltage or less, and
• the wake-up circuit outputs a switch signal from the output terminal to switch the mode to the normal mode when at least one of the plurality of switches is turned on and a potential of the connection terminal is brought into a first level while the information processing apparatus is in the power-saving mode.