ADP5589ACBZ-01-R7

Overview

The ADP5589ACBZ-01-R7 is a 19-port I/O expander with an integrated keypad matrix decoder, programmable logic, reset generator, and PWM generator. It operates on a supply voltage of 1.65 V to 3.6 V and communicates via an I2C interface supporting fast-mode plus up to 1 MHz. The device features a 16-event FIFO for recording key presses, releases, GPI changes, and logic activity. It supports keypad matrices up to 11 columns by 8 rows and includes dual programmable logic blocks, two reset generators, and configurable pull-up/pull-down resistors. The component is housed in a 25-ball WLCSP package measuring 1.99 mm × 1.99 mm.

Feature Summary

• Integrated 16-element event FIFO for tracking key, GPI, and logic events without continuous processor monitoring
• Built-in keypad matrix decoder supporting configurations up to 11 columns by 8 rows with ghosting prevention logic
• Dual programmable logic blocks allowing integration of common logic functions directly within the GPIO expander
• Configurable I/O structure with selectable internal pull-up (100 kΩ or 300 kΩ) and pull-down (300 kΩ) resistors

Applications

• Portable devices requiring keypad entry and I/O expansion capabilities
• Applications needing reduction of processor I/O requirements through interface connectors
• Systems utilizing front panel designs where board area and cost savings are prioritized

Procurement Notes

Verify the specific ordering suffix -01 indicates reset pass-through functionality where RESET1 follows the RST pin level. Confirm the WLCSP-25 package dimensions match the target PCB footprint. Ensure the I2C bus capacitance limits are respected for reliable communication at the specified clock frequencies.

Selection Notes

Select this variant when reset pass-through behavior is required for the system architecture. Compare against the -00 series if default GPIO pull-up states are preferred over reset passthrough. Consider the LFCSP-24 version if larger package handling is necessary for assembly processes. Verify that the 1.99 mm × 1.99 mm WLCSP footprint aligns with manufacturing capabilities.

Part Context

This component belongs to the ADP5589 family from Analog Devices, designed specifically for portable and nonportable applications. It serves as an interface IC to expand processor I/O lines while offloading keypad scanning tasks. The ACBZ-01 suffix distinguishes it from other feature sets within the same logical family regarding reset and pull configuration behaviors.

Replacement Considerations

Public confirmed substitute part numbers: ADP5589ACPZ-01-R7 (LFCSP-24 package variant), ADP5589ACBZ-00-R7 (WLCSP-25 package with different reset/pull defaults).

FAQ

What is the maximum keypad matrix size supported by the ADP5589?

The ADP5589 supports a maximum keypad matrix size of 11 columns by 8 rows, accommodating up to 88 unique keys.

How does the ADP5589 handle keypad ghosting?

Ghosting is prevented by selecting a keypad matrix layout that avoids three-key combinations forming right angles. The device detects simultaneous presses across rows/columns but relies on layout design to avoid false positives.

What is the function of the Event FIFO in the ADP5589?

The 16-event FIFO records key press/release events, GPI changes, and logic activity. It allows the main processor to read event status periodically rather than continuously monitoring registers, reducing power consumption.