The **CSACW22M5X53-R0** is a specific electronic component belonging to the **Ceramic Resonator** family, manufactured by **Murata Electronics**. These components are used to provide a stable clock signal for microcontrollers and other digital circuits. --- ## 1. Component Overview A ceramic resonator functions similarly to a quartz crystal but is built using piezoelectric ceramics. It is generally smaller and more cost-effective, though slightly less accurate than quartz. ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Nominal Frequency** | 22.50 MHz | | **Frequency Tolerance** | ±0.5% (Typical) | | **Package Type** | SMD (Surface Mount Device) | | **Resonant Impedance** | 50 $\Omega$ (Max) | | **Load Capacitance** | Built-in (typically around 5-10pF) | | **Operating Temperature** | -20°C to +80°C | --- ## 2. Key Features and Design * **Built-in Load Capacitors:** This specific series (CSACW) often features internal load capacitors. This simplifies the PCB design because you do not need to add external capacitors to the oscillating circuit. * **SMD Form Factor:** The "CW" designation indicates a small, low-profile surface mount package, ideal for high-density circuit boards in consumer electronics. * **High Stability:** While not as precise as a Crystal Oscillator (XO), it provides significantly better stability than an internal RC oscillator found inside many MCUs. --- ## 3. Pinout and Circuit Application Typically, a ceramic resonator like this has **3 terminals**: 1. **Input (Osc1):** Connects to the XTAL_IN pin of the microcontroller. 2. **Ground:** Connects to the system ground (necessary for the built-in capacitors). 3. **Output (Osc2):** Connects to the XTAL_OUT pin of the microcontroller. ### Typical Implementation ```c // Concept: Microcontroller Clock Configuration // Frequency: 22.5 MHz // Use: Set clock source to 'External Resonator/Crystal' // in the MCU Fuse settings or Clock Tree. ``` --- ## 4. Common Applications * **Microcontrollers:** Serving as the heartbeat for 8-bit or 32-bit MCUs. * **Consumer Electronics:** Remote controls, toys, and small appliances. * **Communication:** Low-speed USB devices or UART timing where ±0.5% tolerance is acceptable.