The **AD22280-R2** is a high-performance, dual-axis accelerometer specifically engineered for automotive safety applications, primarily used in airbag deployment systems and impact sensing. --- ### 1. Key Technical Specifications The device is designed to measure acceleration in two perpendicular axes (X and Y) with high precision and integrated signal conditioning. | Feature | Specification | | :--- | :--- | | **Measurement Range** | ±50g (Standard) | | **Output Type** | Analog Voltage | | **Axes** | Dual (X and Y) | | **Package Type** | LCC-8 (Leadless Chip Carrier) | | **Supply Voltage** | 5.0V (Typical) | | **Operating Temp** | -40°C to +105°C | --- ### 2. Internal Components and Architecture The AD22280-R2 is an Integrated Circuit (IC) that combines Micro-Electro-Mechanical Systems (MEMS) technology with standard CMOS processing. * **MEMS Sensor Core:** Uses a differential capacitive surface-micromachined structure. When acceleration is applied, the proof mass moves, changing the capacitance between fixed and moving plates. * **Signal Conditioning:** Includes a pre-amplifier, a synchronous demodulator, and a filter. This converts the tiny capacitance changes into a measurable voltage. * **Temperature Compensation:** Built-in circuitry compensates for sensitivity and offset shifts caused by temperature fluctuations. * **Self-Test Circuitry:** Allows the system to electronically simulate a force on the sensor to verify that both the mechanical and electronic portions are functioning correctly. --- ### 3. Pin Configuration (Typical LCC-8) | Pin | Function | Description | | :--- | :--- | :--- | | **VDD** | Power Supply | Input voltage (usually 5V). | | **GND** | Ground | Common reference point. | | **X-OUT** | X-Axis Output | Analog voltage proportional to X-axis acceleration. | | **Y-OUT** | Y-Axis Output | Analog voltage proportional to Y-axis acceleration. | | **ST** | Self-Test | Input pin to trigger the internal self-test diagnostic. | --- ### 4. Major Applications Because of its reliability and specific G-force rating, it is found in: 1. **Airbag Control Units (ACU):** Sensing side-impact or front-impact collisions. 2. **Vehicle Dynamics:** Monitoring chassis movement and stability control. 3. **Industrial Vibration:** High-G monitoring in heavy machinery. ---