The **FPM3022H-R010BAP** is an optical fingerprint sensor module designed for biometric identification and authentication. It integrates high-performance optical imaging with onboard processing capabilities. --- ## 1. Core Electronic Specifications The following table outlines the primary electrical and technical parameters of the module: | Parameter | Specification | | :--- | :--- | | **Supply Voltage (VDD)** | 3.3V to 5.0V DC | | **Operating Current** | < 100mA (Peak) | | **Standby Current** | < 20μA (Low power mode) | | **Interface** | UART (TTL Serial) / USB 1.1 | | **Baud Rate** | 9600 to 115200 bps (Default: 57600) | | **Sensor Type** | Optical CMOS | | **Resolution** | 500 DPI | | **Verification Speed** | < 1.0 seconds | --- ## 2. Key Components & Features The module is composed of several critical electronic sub-systems: ### A. Optical Imaging System * **CMOS Sensor:** Captures high-resolution images of the fingerprint ridges. * **LED Backlight:** Typically blue or green LEDs that illuminate the finger when placed on the prism to ensure high-contrast imaging. ### B. Digital Signal Processor (DSP) * The module contains an internal ASIC/DSP that handles: * **Image Pre-processing:** Filtering noise and enhancing ridge patterns. * **Template Extraction:** Converting the image into a mathematical "minutiae" map. * **Matching Algorithm:** Comparing the scanned finger against stored templates in the internal flash memory. ### C. Storage (Flash Memory) * It features onboard non-volatile memory capable of storing fingerprint templates (usually ranging from 100 to 1000 templates depending on the specific firmware version). --- ## 3. Interface Pinout (Typical 6-Pin Connector) The electronic connection is usually handled via a 1.25mm or 1.0mm pitch connector: 1. **VCC:** Power Supply (3.3V - 5V). 2. **GND:** Ground. 3. **TXD:** Data Transmit (Connect to MCU RX). 4. **RXD:** Data Receive (Connect to MCU TX). 5. **Touch/IRQ:** (Optional) Active-low output signal that triggers when a finger is detected on the sensor. 6. **3.3V Out:** (Optional) Regulated output for external logic. --- ## 4. Communication Protocol The module operates using a **Hexadecimal Packet Protocol**. A standard communication frame follows this structure: ```c // Example Header Structure [Header (2 bytes)] + [Address (4 bytes)] + [Package ID (1 byte)] + [Length (2 bytes)] + [Contents (N bytes)] + [Checksum (2 bytes)] ``` * **Header:** Usually `0xEF01`. * **Package ID:** Identifies if the packet is a command, data, or acknowledgment. * **Checksum:** Used for error detection in noisy electronic environments.