ADP5588ACPZ-R7

Overview

The ADP5588ACPZ-R7 is an I/O port expander and keypad matrix controller manufactured by Analog Devices Inc. It operates within a supply voltage range of 1.7 V to 3.0 V and communicates via an I2C interface with a maximum clock frequency of 400 kHz. The device provides 18 configurable GPIOs or supports a 10x8 keypad matrix (80 keys). It features open-drain interrupt outputs, programmable pull-ups, and two dedicated light sensor inputs on pins C8 and C9. The component is housed in a 24-lead LFCSP package measuring 4 mm x 4 mm and functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Configurable as either an 18-GPIO port expander or a 10x8 column-by-row keypad matrix for extensive key scanning.
• Includes dual comparator inputs (C8 and C9) specifically designed for ambient light sensor applications.
• Features an internal FIFO buffer and key event counter capable of tracking up to 10 unprocessed events with overflow handling.

Applications

• QWERTY mobile phone designs requiring large keypad matrices
• Portable devices needing expanded general-purpose I/O lines
• Systems utilizing ambient light sensing for display control

Procurement Notes

Verify the specific ordering suffix R7 corresponds to the required reel packaging configuration. Confirm that the LFCSP-24 package dimensions align with the target PCB footprint. Ensure the I2C address settings do not conflict with other devices on the bus. Check RoHS compliance documentation for final assembly requirements.

Selection Notes

Select this component when a single IC must handle both extensive keypad scanning and additional GPIO expansion. Verify that the system power supply remains within the 1.7 V to 3.0 V operational window. Consider the 400 kHz I2C speed limit for system timing constraints. Evaluate the need for the integrated debounce and FIFO features to reduce host processor load.

Part Context

This part belongs to the ADP5588 series of mobile I/O expanders. It is distinct from LED drivers or voltage regulators due to its focus on input/output expansion and matrix scanning. The ACPZ-R7 designation indicates the specific commercial temperature grade and tape-and-reel packaging format provided by Analog Devices.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the verified source material. Cross-reference pinouts and register maps if considering alternative I/O expanders from different manufacturers.

FAQ

How does the ADP5588 handle key events exceeding its buffer capacity?

The device includes an overflow feature. When the 10-key FIFO is full, new events can either be discarded or cause the oldest data to be overwritten, depending on the OVR_FLOW_M bit setting in Register 0x01.

What is the function of pins C8 and C9?

Pins C8 and C9 serve as column inputs for the keypad matrix but can also be configured as comparator inputs for external light sensors, requiring 0.1 μF capacitors when used in sensor mode.

Can the ADP5588 generate interrupts for General Purpose Inputs?

Yes, GPIs can be configured to generate interrupts. The active level (high or low) is programmable, and these events can be tracked in the key event table if enabled.