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