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The ADP5588ACPZ is an I/O port expander and keyboard matrix designed for QWERTY telephones requiring large keyboard matrices and extended I/O lines. This I/O expander IC addresses the limitation of GPIO pins on the main processor within mobile platforms.

Housed in a compact 4 mm × 4 mm package, the ADP5588ACPZ possesses sufficient capability to handle all key scanning and decoding tasks, signalling key presses and releases to the processor via an I²C® interface and interrupts. This frees the main microprocessor from keyboard monitoring duties, thereby reducing current consumption and increasing processor bandwidth. It incorporates a buffer/FIFO and key event counter, capable of processing and tracking up to 10 pending key presses or GPIO events through overflow line-clear and interrupt functionality.

The ADP5588ACPZ incorporates a keyboard lock function, with the option to trigger or suppress interrupts upon key press and release. All communication with the host processor is accomplished via a single interrupt line and two I²C-compatible interface lines. The ADP5588ACPZ can be configured for keyboard matrices of up to 8 rows × 10 columns (maximum 80 keys).

ADP5588ACPZ Features

18-GPIO port expander or 10 × 8 keyboard matrix

GPIO configurable as GPI, GPO, and keyboard row or column

Dual optical sensor inputs (C8 and C9)

I²C interface

I²C register read auto-increment

1.8 V to 3.0 V operating voltage

Keyboard lock function

Open-drain interrupt output

Key press and key release interrupts

Level-programmable GPI interrupts

Programmable pull-up resistor

Key event counter with overflow interrupt

50 μs debounce on reset line and GPIs

Typical idle current of 1 μA during single key press, typical polling current consumption of 55 μA

Compact 4 mm × 4 mm LFCSP package

ADP5588ACPZ Applications

Keyboard and I/O expander designed for QWERTY telephones requiring large keyboard matrices

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