## ADM1815-R23ART-RL: Electronic Component Overview The **ADM1815-R23ART-RL** is a high-precision voltage monitoring device, specifically a **microprocessor supervisory circuit** manufactured by Analog Devices. It is designed to monitor power supply voltages in microprocessor systems and provide a reset signal during power-up, power-down, and brownout conditions. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Reset Threshold** | 2.31V (Nominal) | | **Output Type** | Open-Drain (Active Low) | | **Supply Voltage (Vcc)** | 1.0V to 5.5V | | **Reset Timeout Period** | 150 ms (typical) | | **Operating Temperature** | -40°C to +105°C | | **Package Type** | SOT-23 (3-lead) | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Functional Description The primary purpose of this part is to ensure that a microprocessor begins operation in a known state and remains safe during power fluctuations. * **Reset Assertion:** When the $V_{CC}$ supply drops below the fixed threshold (2.31V), the `RESET` output goes low. * **Reset Timeout:** Once $V_{CC}$ rises above the threshold, the `RESET` signal remains active for an additional 150ms. This "timeout" ensures that the power supply has stabilized before the processor starts executing code. * **Open-Drain Output:** This specific variant features an open-drain output, which requires an external pull-up resistor. This allows for "wired-OR" logic if multiple reset sources are needed. --- ### 3. Pin Configuration | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | `RESET` | Active-low output signal. Remains low while $V_{CC}$ is below threshold. | | 2 | $V_{CC}$ | Power supply input and the voltage being monitored. | | 3 | GND | Ground reference. | --- ### 4. Application Logic (Simplified) In a typical circuit, the connection would look like this: ```markdown [Power Rail 2.5V/3.3V] ----+---- [Vcc Pin 2] | [Pull-up Resistor] | [MCU Reset Pin] <----------+---- [RESET Pin 1] ``` --- ### 5. Part Number Breakdown: ADM1815-R23ART-RL * **ADM1815:** Base Model (Microprocessor Monitor). * **R23:** Represents the **2.31V** reset threshold. * **ART:** Indicates the **SOT-23** package type. * **RL:** Indicates **Reel** packaging (Tape & Reel for automated assembly).