ADP5588ACPZ-R7 - 18-GPIO Mobile Keypad Controller | Analog Devices
MPN: ADP5588ACPZ-R7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.6553 | $3.66 |
| 10 | $3.49 | $34.90 |
| 100 | $3.18 | $318.00 |
| 500 | $2.84 | $1,420.00 |
| 1,000 | $2.57 | $2,570.00 |
| 3,000 | $2.21 | $6,630.00 |
ADP5588ACPZ-R7 Overview
An I/O expander is an interface IC that extends the number of digital input and output lines available to a host controller. A keypad controller adds matrix-scanning and event detection, while an I2C interface IC connects compact peripheral logic to a processor bus. Within the hierarchy of interface ICs, this device reduces wiring and pin demand in mobile, wearable, and compact embedded systems.
Key features include 18 GPIOs configurable as inputs, outputs, keypad rows, or keypad columns; two dedicated light-sensor inputs; I2C register-read autoincrement; programmable pull-ups; keypad locking; an open-drain interrupt output; and key-press and key-release interrupts. The GPI interrupt also supports programmable levels. These functions allow one controller to handle both a large keypad and additional discrete interface signals.
The ADP5588 is designed for low-voltage mobile platforms. Verified manufacturer data specifies operation from 1.8 V to 3.0 V, while one distributor summary separately emphasizes 3.0 V operation. The compact 24-LFCSP-WQ package is suited to space-constrained boards, but its fine pitch requires careful PCB layout and assembly. Its I2C connection reduces host pins, although firmware must configure GPIO direction, pull-ups, interrupt behavior, and keypad dimensions.
Typical uses include QWERTY keypad modules, handheld calculators, mobile accessories, wearable controls, light-sensor-equipped keypads, industrial key-entry panels, and custom HMI boards. The device can expand a processor with limited GPIO while providing dedicated key events through its interrupt output.
Designers should verify the complete pinout, exposed-pad connection, address configuration, and supported I2C clock and voltage limits in the manufacturer datasheet. Place the device close to the keypad matrix, provide clean local decoupling, route I2C signals away from switching nodes, and validate signal levels and pull-ups across the complete system voltage range.
This page consolidates verified distributor availability, manufacturer functionality, packaging data, purchasing information, and application guidance. It distinguishes documented functions from parameters that still require confirmation, helping engineers evaluate the ADP5588ACPZ-R7 without inferring missing electrical values.
Drop-in alternatives for ADP5588ACPZ-R7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADP5588ACPZ-R7 (same form factor and footprint) — differing in Package, Product Type, GPIO Configuration, Host Interface, Keypad Matrix.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesADP5588ACPZ-R7 Specifications
| Product Type | Mobile I/O expander and QWERTY keypad controller |
| GPIO Count | 18 GPIO |
| Keypad Matrix Capability | 10 × 8 keypad matrix |
| GPIO Configuration | Configurable as GPI, GPO, keypad row, or keypad column |
| Light-Sensor Inputs | 2 dedicated inputs on C8 and C9 |
| Host Interface | I2C |
| I2C Register Read | Autoincrement |
| Operating Voltage Range | 1.8 V to 3.0 V |
| Keypad Lock | Supported |
| Interrupt Output | Open-drain |
| Key Interrupts | Key-press and key-release interrupts |
| GPI Interrupt | Programmable level |
| Programmable Pull-Ups | Supported |
| Key Event Counter | Supported |
| Package | 24-LFCSP-WQ, 4 mm × 4 mm |
| Mounting Type | Surface mount |
| Manufacturer Lifecycle Designation | Production |
ADP5588ACPZ-R7 24-lfcsp-wq, 4 mm × 4 mm Pin Configuration Guide
Pin configuration for ADP5588ACPZ-R7 (24-lfcsp-wq, 4 mm × 4 mm package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for ADP5588ACPZ-R7.
Refer to the datasheet for full pin configuration.
Typical Applications
ADP5588ACPZ-R7 is suitable for 7 applications: Mobile QWERTY Keypad, Wearable Control Interface, Industrial Key-Entry Panel, Handheld Calculator, Mobile Accessory and Dock, Light-Sensor-Equipped Keypad, Custom HMI and Service Panel.
Mobile QWERTY Keypad
The ADP5588ACPZ-R7 fits a mobile QWERTY keypad because its keypad controller can support a matrix up to 10 × 8 while sharing 18 configurable GPIOs for auxiliary controls. The host communicates through I2C instead of dedicating many processor pins to every key line. Key-press and key-release interrupts reduce unnecessary polling, while keypad locking and programmable pull-ups support robust mechanical and electrical behavior.
Recommended
Wearable Control Interface
The ADP5588ACPZ-R7 is useful in wearables that need more controls than the host MCU has available. Its 18 GPIOs can represent switches, menu inputs, or accessory signals, while the keypad functions support compact button matrices. The 1.8 V to 3.0 V operating range aligns with many low-voltage mobile systems, and the 4 mm × 4 mm package helps preserve board area. Battery-life decisions should include the device's verified operating current before final sizing.
Recommended
Industrial Key-Entry Panel
The ADP5588ACPZ-R7 can serve as the keypad front end for an industrial key-entry panel with many physical inputs. The 10 × 8 keypad capability covers larger matrices, and the programmable GPIOs can add lock indicators, status lamps, or auxiliary controls. I2C register autoincrement simplifies host access to sequential keypad data, while key-event interrupts help the controller respond without continuously scanning every row and column.
Recommended
Handheld Calculator
A calculator keypad is a natural fit for the ADP5588ACPZ-R7 because it requires a dense matrix of keys plus limited system I/O. The controller handles scanning and decoding locally, reducing MCU pin count and firmware burden. Its key-press and key-release events, keypad lock capability, and programmable pull-ups support robust user interaction. For very low-power products, verify quiescent and active current from the complete manufacturer electrical data before finalizing the battery budget.
Recommended
Mobile Accessory and Dock
The ADP5588ACPZ-R7 can add a compact keypad or control panel to a mobile accessory or docking product without consuming a large number of host GPIO pins. Its I2C interface is appropriate for a short, low-voltage embedded bus, while the 18-GPIO bank supports buttons, indicators, and accessory-control signals. The exact I2C address and bus timing must be taken from the manufacturer documentation, especially when multiple expandable peripherals share the same bus.
Recommended
Light-Sensor-Equipped Keypad
The ADP5588ACPZ-R7 is appropriate when a keypad must also monitor light-sensor inputs. Verified device information identifies dedicated C8 and C9 inputs, while the remaining GPIO bank supports keypad rows, columns, and other digital controls. This arrangement can consolidate a touch-like or illuminated keypad interface in one package. Validate analog or digital sensor signal requirements separately because the supplied data does not specify sensor transfer characteristics or electrical limits for those channels.
Recommended
Custom HMI and Service Panel
The ADP5588ACPZ-R7 fits custom human-machine interface panels that combine a keypad with a small set of status or service inputs. Its programmable GPIOs allow rows, columns, discrete controls, and interrupt-capable lines to share the same controller. The I2C autoincrement register-read feature can simplify sequential keypad-data retrieval, and the open-drain interrupt output provides a flexible host notification path. Panel-specific ESD, connector, and grounding requirements must be engineered separately.
Recommended
Recommended Products Summary
Engineering reference data for ADP5588ACPZ-R7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 24-LFCSP-WQ (4 mm × 4 mm) |
| Brand | Analog Devices |
| Product Type | Mobile I/O expander and QWERTY keypad controller |
| GPIO Count | 18 GPIO |
| Keypad Matrix | Up to 10 × 8 |
| Light-Sensor Inputs | 2 dedicated inputs on C8 and C9 |
| Operating Voltage | 1.8 V to 3.0 V |
| Host Interface | I2C |
| Interrupt Output | Open-drain |
| Special Features | Keypad lock, key event counter, programmable pull-ups, I2C register autoincrement |
| Price Reference | $3.6553 starting price from LCSC as of 2026-10-23 |
Key Differentiators
- Integrated keypad matrix controller (vs PCF8574PW)
- Wider GPIO count for keypad and auxiliary control (vs PCA9557D)
- Dedicated light-sensor inputs (vs PCF8574PW)
- Low-voltage mobile integration (vs PCA9557D)
Design Notes
Treat the 24-LFCSP-WQ footprint as a fine-pitch layout constraint and follow the exact Analog Devices land pattern and exposed-pad guidance. Place decoupling close to the supply pins, keep the I2C route short, and provide adequate return-path continuity. Verify the package drawing and assembly process before committing the PCB footprint, because distributor abbreviations can describe the same family with different package-detail conventions.
Route keypad row and column traces with attention to capacitive loading, crosstalk, and switch bounce. The ADP5588 handles scanning and decoding, but long or noisy matrix traces can still affect signal integrity. Keep the controller near the keypad connector where practical, separate I2C and interrupt routing from switching-power paths, and use pull-up values and rise-time limits from the manufacturer documentation and the actual bus capacitance.
Do not substitute a generic I2C GPIO expander without checking the complete ADP5588 register map, interrupt polarity, keypad configuration, light-sensor channels, and 24-LFCSP-WQ footprint. The device also has a 1.8 V to 3.0 V operating range; level-shift any bus or signal that falls outside that range. Validate firmware initialization, key lock behavior, pull-ups, and wake-up requirements on hardware before production release.
The supplied verified material confirms a 1.8 V to 3.0 V operating range but does not provide verified active or quiescent current values. Therefore, calculate battery and regulator headroom using the complete manufacturer electrical specifications rather than estimated assumptions. Confirm the external regulator tolerance, I2C pull-up current, keypad drive current, and any light-sensor load during worst-case operation.
The I2C bus and open-drain interrupt lines depend on correct pull-up implementation and compatible voltage levels. Confirm the device's address configuration and bus timing against the host MCU, and ensure interrupt polarity and debounce behavior match firmware expectations. Keep pull-up traces short where possible and account for capacitance, rise time, pull-up current, and any level-shifter propagation delay.
Compliance Information
The supplied verified data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for ADP5588ACPZ-R7. Obtain current manufacturer declarations before using this part in regulated production.
