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ADP5587:  Mobile I/O Expander and QWERTY Keypad Controller

Product Details

Product Status:Recommended for New Designs

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

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

Functional Block Diagram for ADP5587

Documentation

Title Content Type File Type
ADP5587: Mobile I/O Expander and QWERTY Keypad Controller Data Sheet (Rev D, 01/2012) (pdf, 357 kB) Data Sheets PDF
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Starting with a communications application overview of small power options through the process of selecting the right power products this webcast is a great resource for your communications applications designs.
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RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADP5588 GPIO Linux Driver Device Drivers HTML
ADP5588 Input Keyboard and GPIO Linux Driver Device Drivers HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

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Price, packaging, availability

ADP5587 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP5587ACBZ-R7 Status: Production 25 Ball WLCSP 25 Ind Reel, 1500 - $1.15 Y  Material Info PCN Purchase Sample
ADP5587ACPZ-1-R7 Status: Production 24 ld LFCSP (4x4x.75mm w/2.10mm EP) 24 Ind Reel, 1500 - $1.15 Y  Material Info PCN Purchase Sample
ADP5587ACPZ-R7 Status: Production 24 ld LFCSP (4x4x.75mm w/2.10mm EP) 24 Ind Reel, 1500 - $1.15 Y  Material Info PCN Purchase Sample
Price Table Help

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.

ADP5587 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADP5587CB-EVALZ Status: Production Evaluation Board $200.00 Yes -
ADP5587CP-EVALZ Status: Production Evaluation Board $200.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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