The **ADP5585ACBZ-01-R7** is a versatile, compact I/O expander designed by Analog Devices. It is primarily used to offload keyboard scanning and GPIO (General Purpose Input/Output) management from the main processor in mobile and portable devices. --- ## 1. Key Specifications Below are the primary technical parameters for the component: | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Analog Devices Inc. | | **Function** | Keypad Decoder / GPIO Expander | | **Interface** | I²C (up to 400 kHz) | | **GPIO Count** | Up to 10 configurable I/Os | | **Keypad Matrix** | Up to 5 × 5 (25 keys) | | **Voltage Supply** | 1.65V to 3.6V | | **Package** | 16-ball WLCSP (Wafer Level Chip Scale Package) | | **Operating Temp** | -40°C to +85°C | --- ## 2. Core Functional Blocks The device is divided into several logical sections that handle different electronic tasks: ### A. Keypad Scanner The internal engine automatically scans a keypad matrix (up to 5 rows and 5 columns). * **FIFO Buffer:** It features an 8-event FIFO to store key presses and releases. * **Ghosting Protection:** It includes logic to handle multiple simultaneous key presses correctly. * **Debouncing:** Built-in programmable hardware debouncing prevents "chatter" or false triggers. ### B. GPIO Expander Any pins not used for the keypad matrix can be configured as GPIOs. * **PWM Generators:** It includes two independent PWM generators for controlling LED brightness or haptic motors. * **Interrupts:** Pins can be configured to trigger an interrupt (`nINT`) to the host processor on logic transitions. ### C. Logic and Control The device communicates via **I²C**. It includes an internal oscillator, so no external clock source is required, reducing the overall Bill of Materials (BOM). --- ## 3. Pin Mapping Example *Note: As a WLCSP package, the pins are arranged in a grid.* | Ball | Symbol | Description | | :--- | :--- | :--- | | A1 | R0 / GPO0 | Row 0 of keypad or General Purpose Output | | B2 | SCL | I²C Clock Input | | B3 | SDA | I²C Data I/O | | C1 | nINT | Interrupt Output (Active Low) | | D4 | VDD | Power Supply | --- ## 4. Typical Application Circuit When integrating this part into a schematic, the typical setup follows this logic: ```c // Pseudo-code for I2C Initialization void setup_adp5585() { write_reg(ADR_ID, 0x01); // Verify device ID write_reg(PIN_CONFIG_A, 0xFF); // Set pins as keypad rows write_reg(PIN_CONFIG_B, 0xFF); // Set pins as keypad columns write_reg(INT_EN, 0x01); // Enable Keypad Interrupt } ``` ---