Mikroe Expand 9 Click features the Semtech Corporation SX1509QB voltage level shifting GPIO expander. The SX1509QB comes in a 16-channel configuration and allows easy serial expansion of I/O through a standard I2C serial interface. It also has a built-in level shifting feature making it highly flexible in power supply systems where communication between incompatible I/O voltages is required. The device also has an integrated LED driver for enhanced lighting, and a keypad scanning engine to implement keypad applications up to 8×8 matrix.