ANALOG DEVICES ADP5587ACPZ-1-R7

ADP5587ACPZ-1-R7 is an I/O port expander and keypad matrix designed for QWERTY type phones that require a large keypad matrix and expanded I/O lines. I/O expander ICs are used in mobile platforms as a solution to the limited number of GPIOs available in the main processor. It contains enough power to handle all key scanning and decoding and to flag the processor of key presses and releases via the I²C interface and interrupt. It frees the main microprocessor from the need to monitor the keypad, thereby minimizing current drain and increasing processor bandwidth. It is also equipped with a buffer/FIFO and key event counter to handle and keep track of up to 10 unprocessed key or GPI events with overflow wrap and interrupt capability. It has keypad lock capability with an option to trigger or not trigger an interrupt at key presses and releases. It is used in applications such as keypad and I/O expander designed for QWERTY type phones that require a large keypad matrix.