ADP5587ACPZ-R7

ADP5587 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. This device frees the main microprocessor from the need to monitor the keypad, thereby minimizing current drain and increasing processor bandwidth. It also equipped with a buffer/FIFO and key event counter to handle and keep track of upto 10 unprocessed key or GPI events with overflow wrap and interrupt capability. It is used in applications such as keypad and I/O expander designed for QWERTY type phones that require a large keypad matrix.

• 18-GPIO port expander or 10 × 8 keypad matrix
• GPIOs configurable as GPIs, GPOs, and keypad rows or columns
• I²C interface with auto-increment, 1.65V to 3.6V operation
• Keypad lock capability, open-drain interrupt output, programmable pull-ups
• Key press and key release interrupts, GPI interrupt with level programmability
• Key event counter with overflow interrupt
• Debounce is 275μs typical, 1μA typical idle current
• 55μA typical polling current, I²C write address is 0x68 (write), 0x69 (read)
• Operating temperature range from -40°C to +85°C
• Package style is 24-lead lead frame chip scale [LFCSP]

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