ADP5588ACPZ-R7

ADP5588 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 flag the processor of key presses and releases via the I²C® interface and interrupt. It frees the main microprocessor from having 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. Application includes keypad and I/O expander designed for QWERTY type phones that require a large keypad matrix.

• GPIOs configurable to GPIs, GPOs, and keypad rows or columns
• Dual light sensor inputs (C8 and C9), I²C register read auto increment
• Keypad lock capability, open-drain interrupt output
• Key press and key release interrupts, GPI interrupt with level programmability
• Programmable pull-ups, key event counter with overflow interrupt
• 50μs debounce on the reset line and GPIs
• VCC input voltage range from 1.7 to 3.0V (TA = TJ = −40°C to +85°C)
• Maximum sensor range from 0.85 to 1.15mA (VCC = 1.8V to 3.0V, TA = 25°C)
• Oscillator current (enabled) is 40μA (typ, VCC = 1.8V to 3.0V)
• 24-lead LFCSP package, temperature range from -40°C to +85°C

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