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GENERAL DESCRIPTION

The ADP5585 is a 10 input/output port expander with a built in keypad matrix decoder, programmable logic, reset generator, and PWM generator. Input/output expander ICs are used in portable devices (phones, remote controls, and cameras) and nonportable applications (healthcare, industrial, and instrumentation). I/O expanders can be used to increase the number of I/Os available to a processor or to reduce the number of I/Os required through interface connectors for front panel designs.

The ADP5585 handles all key scanning and decoding and can flag the main processor via an interrupt line that new key events have occurred. GPI changes and logic changes can also be tracked

as events via the FIFO, eliminating the need to monitor different registers for event changes. The ADP5585 is equipped with a FIFO to store up to 16 events. Events can be read back by the processor via an I2C-compatible interface.

The ADP5585 frees up the main processor from having to monitor the keypad, thereby reducing power consumption and/or increasing processor bandwidth for performing other functions.

The programmable logic functions allow common logic require-ments to be integrated as part of the GPIO expander, thus saving board area and cost.

FEATURES

16-element FIFO for event recording

10 configurable I/Os allowing functions such as

Key pad decoding for a matrix of up to 5 × 5

11 GPIOs (5 × 6) with ADP5585ACxZ-01-R7 models

Key press/release interrupts

GPIO functions

GPI with selectable interrupt level

100 kΩ or 300 kΩ pull-up resistors

300 kΩ pull-down resistors

GPO with push-pull or open-drain

Programmable logic block

PWM generator

Internal PWM generation

External PWM with internal PWM AND function

Reset generators

I2C interface with fast mode plus (Fm+) support of up to 1 MHz

Open-drain interrupt output

16-ball WLCSP, 1.59 mm × 1.59 mm

16-lead LFCSP, 3 mm × 3 mm

APPLICATIONS

Keypad entries and input/output expansion capabilities

Smart phones, remote controls, and cameras

Healthcare, industrial, and instrumentation