Data Sheet
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 Ч 5 11 GPIOs (5 Ч 6) with ADP5585ACxZ-01-R7 models Key press/release interrupts GPIO functions GPI with selectable interrupt level 100 k or 300 k pull-up resistors 300 k 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 Ч 1.59 mm 16-lead LFCSP, 3 mm Ч 3 mm Keypad Decoder and I/O Expansion ADP5585
FUNCTIONAL BLOCK DIAGRAM
VDD GND ADP5585
RST/R5 SDA SCL INT KEY SCAN AND DECODE GPI SCAN AND DECODE I/O CONFIG LOGIC PWM RESET1 GEN
09841-001 UVLO POR I2C INTERFACE OSCILLATOR R0 R1 R2 R3 R4 C0 C1 C2 C3 C4 REGISTERS RESET2 GEN Figure 1. APPLICATIONS
Keypad entries and input/output expansion capabilities Smart phones, remote controls, and cameras Healthcare, industrial, and instrumentation 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 requirements to be integrated as part of the GPIO expander, thus saving board area and cost. Rev. C Document Feedback One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©20112013 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com Information furnished by Analog Devices is believed to be accurate and reli …
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