Overview
The ADP5588ACPZ-R7, produced by Analog Devices Inc., is a versatile I/O port expander and keypad matrix controller designed specifically for QWERTY type phones and other mobile platforms. This device addresses the limitation of available GPIOs in the main processor by providing an expanded I/O capability. It handles key scanning and decoding, communicating with the main processor via the I²C interface and interrupt lines, thereby minimizing current drain and increasing processor bandwidth. The ADP5588 is packaged in a compact 24-lead Lead Frame Chip Scale Package (LFCSP) and operates within a temperature range of -40°C to +85°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCC Input Voltage Range | 1.7 to 3.0 | V |
| Operating Temperature Range | -40°C to +85°C | °C |
| Package Type | 24-Lead LFCSP | |
| Interface | I²C | |
| Number of I/Os | 18 | |
| Keypad Matrix Configuration | Up to 8 rows × 10 columns | |
| Internal Pull-up Resistance for GPIOs | 100 kΩ | Ω |
| Reset Line Debounce Time | 50 μs | s |
| Moisture Sensitivity Level (MSL) | 3 (168 hours) |
Key Features
- Integrated keypad and I/O expansion, allowing for up to 80 keys in an 8x10 matrix configuration.
- On-chip FIFO event buffer to handle up to 10 unprocessed key or GPI events with overflow wrap and interrupt capability.
- Key lock capability with the option to trigger or not trigger an interrupt at key presses and releases.
- Programmable logic for custom functions and adjustable I²C address.
- Dual light sensor inputs (C8 and C9) and comparator inputs for photosensors.
- Smooth keypad scanning and management, minimizing CPU loading.
- Low standby current for power-sensitive applications.
- Open-drain interrupt output and GPI interrupt with level programmability.
Applications
The ADP5588ACPZ-R7 is primarily designed for QWERTY type phones and other mobile platforms that require a large keypad matrix and expanded I/O lines. It is also suitable for various portable devices needing extended keypad and I/O capabilities. Additional applications include alarm systems and any scenario where GPIO expansion and keypad management are necessary.
Q & A
- What is the primary function of the ADP5588ACPZ-R7?
The ADP5588ACPZ-R7 is an I/O port expander and keypad matrix controller designed to handle key scanning and decoding, and to expand the I/O capabilities of mobile platforms.
- What is the operating voltage range of the ADP5588ACPZ-R7?
The operating voltage range is from 1.7V to 3.0V.
- What type of package does the ADP5588ACPZ-R7 come in?
The device is packaged in a 24-lead Lead Frame Chip Scale Package (LFCSP).
- How many I/Os does the ADP5588ACPZ-R7 support?
The device supports up to 18 I/Os, which can be configured as GPIs, GPOs, or keypad rows/columns.
- What is the maximum keypad matrix configuration supported by the ADP5588ACPZ-R7?
The device can be configured to support up to an 8x10 keypad matrix, allowing for a maximum of 80 keys.
- Does the ADP5588ACPZ-R7 have any power-saving features?
Yes, it has a low standby current, making it suitable for power-sensitive applications.
- How does the ADP5588ACPZ-R7 communicate with the main processor?
The device communicates via the I²C interface and uses an interrupt line to notify the processor of key presses and releases.
- What is the purpose of the FIFO event buffer in the ADP5588ACPZ-R7?
The FIFO event buffer handles up to 10 unprocessed key or GPI events with overflow wrap and interrupt capability.
- Does the ADP5588ACPZ-R7 support any light sensor inputs?
Yes, it supports dual light sensor inputs (C8 and C9) and comparator inputs for photosensors.
- What is the debounce time for the reset line on the ADP5588ACPZ-R7?
The reset line debounce time is 50 μs.
