ADP5586 Datasheet, PDF (1/44 Pages) Analog Devices – Keypad Decoder and I/O Port Expander

Data Sheet
Keypad Decoder and I/O Port Expander
ADP5586
FEATURES
16-element FIFO for event recording
10 configurable I/Os allowing for such functions as
Keypad decoding for a matrix of up to 5 × 5
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
Pulse generators
Periods and on times
Above 30 sec in 125 ms increments
Up to 255 ms in 1 ms increments
Reset generator
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
APPLICATIONS
Keypad entries and input/output expansion capabilities
Smartphones, remote controls, and cameras
Healthcare, industrial, and instrumentation
GENERAL DESCRIPTION
The ADP5586 is a 10-input/output port expander with a built-in
keypad matrix decoder, programmable logic, reset generator, and
pulse generators. 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 ADP5586 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
FUNCTIONAL BLOCK DIAGRAM
VDD
GND
RST/R5
ADP5586
UVLO
POR
OSCILLATOR
SDA
SCL
I²C INTERFACE
INT
R0
R1
R2
R3
R4
I/O
CONFIG
C0
C1
C2
C3
C4
KEY SCAN
AND
DECODE
GPI SCAN
AND
DECODE
LOGIC
PULSE
GEN 1
PULSE
GEN 2
RESET
GEN
Figure 1.
REGISTERS
as events via the FIFO, eliminating the need to monitor different
registers for event changes. The ADP5586 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 ADP5586 eliminates the need for the main processor to
monitor the keypad, thus 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.
Rev. 0
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