The **MN13802-RTA** is a specialized integrated circuit designed primarily for voltage detection and system reset functions. It is commonly used in battery-powered devices and microprocessor systems to ensure reliable operation during power-up or power fluctuations. --- ### 1. Key Technical Specifications The MN13802-RTA belongs to the MN1380 series, characterized by low power consumption and precise threshold detection. | Parameter | Specification | | :--- | :--- | | **Function** | CMOS Voltage Detection / Reset IC | | **Detection Voltage ($V_{DL}$)** | 4.0V to 4.3V (Specific to "R" rank) | | **Operating Voltage ($V_{DD}$)** | 2.0V to 7.0V | | **Current Consumption** | Typ. 1.0 $\mu$A (Very Low) | | **Output Type** | N-channel Open Drain | | **Package Type** | Mini 3P (SOT-23 equivalent) | --- ### 2. Functional Description The device monitors the power supply voltage ($V_{DD}$). Its primary roles are: 1. **Power-On Reset:** It holds the CPU in a reset state until the power supply stabilizes above the threshold voltage. 2. **Voltage Drop Detection:** If the supply voltage drops below the detection threshold ($V_{DL}$), the IC pulls the reset line low to prevent the processor from executing corrupted instructions. 3. **Hysteresis:** It includes a small amount of hysteresis voltage ($V_{HYS}$) to prevent "chattering" (rapid switching) when the supply voltage is hovering near the threshold. --- ### 3. Pin Configuration The MN13802-RTA typically features three pins: * **Pin 1 (OUT):** The Reset output signal. Since it is N-channel open drain, it usually requires a pull-up resistor. * **Pin 2 (VDD):** Power supply input and monitored voltage pin. * **Pin 3 (VSS/GND):** Ground reference. --- ### 4. Circuit Implementation Below is a basic representation of how the MN13802-RTA is integrated into a circuit: ```c // Typical Connection Logic [Power Source (Vcc)] ----+---- [VDD Pin] | [Pull-up Resistor] | [MCU Reset Pin] <--------+---- [OUT Pin] [Ground] ---------------------- [VSS Pin] ``` --- ### 5. Applications * **Microcomputer Systems:** Preventing malfunctions during power-on/off. * **Battery Checkers:** Monitoring battery health and triggering low-battery shutdowns. * **Volatile Memory Protection:** Ensuring SRAM data is not corrupted during voltage brownouts.