The **UC62140G-AF5-R** is a high-precision, low-power CMOS voltage detector (reset IC) manufactured by UTC (Unisonic Technologies Co., Ltd). It is primarily used to monitor power supply voltage and provide a reset signal to a microprocessor when the voltage falls below a specific threshold. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Detection Voltage** | Fixed (Varies by model, suffix "40" typically indicates 4.0V) | | **Output Type** | Open Drain (Active Low) | | **Package Type** | SOT-25 (AF5) | | **Input Voltage Range** | 1.0V to 15.0V | | **Operating Current** | 1.0 µA (Typical) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Part Number Breakdown The suffixing on this part provides specific details about its physical and electrical properties: * **UC62140**: The series name (CMOS Voltage Detector). * **G**: Halogen-free and Lead-free (Green). * **AF5**: Package code for **SOT-25**. * **R**: Tape and Reel packaging. --- ### 3. Functional Description The device consists of a reference voltage source, a comparator, a delay circuit, and an output driver. 1. **Voltage Monitoring**: It constantly monitors the $V_{DD}$ pin. 2. **Threshold Detection**: When the monitored voltage drops below the pre-set detection voltage ($V_{DET}$), the output ($V_{OUT}$) goes **Low**. 3. **Hysteresis**: It incorporates a hysteresis range (typically 5%) to prevent "chattering" or rapid switching when the input voltage is near the threshold level. 4. **Reset Release**: Once the voltage rises above the threshold (plus hysteresis), the output returns to **High** after a short delay. --- ### 4. Typical Application Circuit Because this specific model features an **Open Drain** output, a pull-up resistor is required for operation. ```c Vdd (Supply) ----+----[ R_pullup ]----+---- Vout (To MCU Reset Pin) | | [ VDD ] [ OUT ] | | [ VSS ]-----------------GND ``` ### 5. Common Uses * **Microprocessor Reset**: Ensuring the MCU starts only when power is stable. * **Battery Life Monitoring**: Alerting a system when a battery is critically low. * **Voltage Switching**: Acting as a trigger for power-saving modes. ---