### Technical Overview: CSTCC2M12G56-R0 The **CSTCC2M12G56-R0** is a specific type of **Ceramic Resonator** manufactured by Murata Electronics. It belongs to the CERALOCK® line, which uses the mechanical resonance of piezoelectric ceramics to create a stable frequency for electronic circuits. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Resonant Frequency** | 2.12 MHz | | **Frequency Tolerance** | ±0.5% | | **Internal Capacitance** | 47 pF (Built-in) | | **Operating Temperature** | -20°C to +80°C | | **Mounting Type** | Surface Mount (SMD) | | **Package / Case** | 7.2mm x 3.0mm (Approx.) | | **Load Capacitance** | Built-in Load Capacitors | --- ### 2. Physical Design and Function The CSTCC series is characterized by its **3-terminal** design. Unlike standard 2-pin crystals that require external load capacitors, this component integrates them internally. * **Input/Output Terminals:** Connect to the oscillator circuit of the MCU. * **Ground Terminal:** The center pin connects to the system ground, serving as the common point for the two internal capacitors. --- ### 3. Comparison: Ceramic Resonator vs. Quartz Crystal It is important to understand why this part is chosen over a standard quartz crystal: | Feature | Ceramic Resonator (CSTCC) | Quartz Crystal | | :--- | :--- | :--- | | **Frequency Stability** | Moderate (±0.5%) | Very High (±0.005%) | | **Startup Time** | Very Fast | Slower | | **Cost** | Low | Higher | | **Size** | Small (Integrated Caps) | Larger (Requires external caps) | --- ### 4. Common Applications Due to its 2.12 MHz frequency and moderate stability, this part is typically found in: 1. **Microcontroller Clocks:** Providing the heartbeat for 8-bit or 16-bit MCUs. 2. **Consumer Electronics:** Remote controls, toys, and small appliances. 3. **Communication Equipment:** Low-speed data processing units where precise timing (like high-speed USB) is not required. --- ### 5. Circuit Implementation To use this part, you connect the outer pins to the `OSC_IN` and `OSC_OUT` pins of your microcontroller, and the middle pin to `GND`. No additional capacitors are needed. ```c // Typical MCU Oscillator Configuration for 2.12MHz // The hardware takes care of the oscillation; software defines the clock source. CLK_Source = EXTERNAL_RESONATOR; System_Clock = 2.12MHz; ``` ---