Overview

Features and Benefits

  • 18-GPIO port expander or 10 × 8 keypad matrix
  • GPIOs configurable as GPIs, GPOs, and keypad rows or columns
  • I2C interface with auto-increment
  • 1.7 V to 3.6 V operation
  • Keypad lock capability
  • Open-drain interrupt output
  • Key press and key release interrupts
  • GPI interrupt with level programmability
  • Programmable pull-ups
  • Key event counter with overflow interrupt
  • 275 μs debounce on the reset line and GPIs
  • See data sheet for additional features

Product Details

The ADP5587 is an I/O port expander and keypad matrix designed for QWERTY type phones that require a large keypad matrix and expanded I/O lines. I/O expander ICs are used in mobile platforms as a solution to the limited number of GPIOs available in the main processor.

In its small 4 mm × 4 mm package, the ADP5587 contains enough power to handle all key-scanning and decoding and to flag the processor of key presses and releases via the I2C interface and interrupt. The ADP5587 frees the main micro-processor from the need to monitor the keypad, thereby minimizing current drain and increasing processor bandwidth. The ADP5587 is also equipped with a buffer/FIFO and key event counter to handle and keep track of up to 10 unprocessed key or GPI events with overflow wrap and interrupt capability.

The ADP5587 has keypad lock capability with an option to trigger or not trigger an interrupt at key presses and releases. All communication to the main processor is done using one interrupt line and two I2C-compatible interface lines. The ADP5587 can be configured as a keypad matrix of up to 8 rows × 10 columns (a maximum of 80 keys).

When the ADP5587 is used for smaller keypad matrices, unused row and column pins can be reconfigured to act as general-purpose inputs or outputs. R0 to R7 denote the row pins of the matrix, whereas C0 to C9 denote the column pins. At power-up, all rows and columns default to GPIs and must be programmed to function as part of the keypad matrix or as GPOs.


Applications
  • Keypad and I/O expander designed for QWERTY type phones that require a large keypad matrix

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

Design Tools

ADIsimPower™ Voltage Regulator Design Tool

ADIsimPower is the fastest and most accurate Power Management design tool. ADI's Design Center lets you design your power circuits in three easy steps.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

PCN-PDN Information

Discussions

ADP5587 Discussions

RE: ADP5587 SPEC. Question
14 week(s) ago in Power By Linear
RE: ADP5587 documentation discrepency?
14 week(s) ago in Power By Linear
RE: adp5587 keypad interfacing
14 week(s) ago in Power By Linear
ADP5587 Didn't find what you were looking for? Ask the Analog community »

Sample & Buy

Sample & Buy functionality exists in desktop site
Back
Check Inventory


The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Price Table Help