## ADM1815-R23ART-RL7 Technical Overview The **ADM1815-R23ART-RL7** is a voltage monitoring and supervisory integrated circuit (IC) manufactured by **Analog Devices**. It is primarily used to monitor power supplies in microprocessor-based systems and initiate a reset during power-up, power-down, and brownout conditions. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Reset Threshold** | 2.31V | | **Output Type** | Push-Pull (Active Low) | | **Reset Timeout Delay** | 150 ms (typical) | | **Supply Voltage (Vcc)** | 1.0V to 5.5V | | **Supply Current** | 12 µA (typical) | | **Operating Temperature** | -40°C to +105°C | | **Package / Case** | SOT-23-3 | --- ### 2. Functional Description The device performs three main functions to ensure system reliability: 1. **Power-On Reset:** When the power is first applied, the device keeps the microprocessor in a reset state for approximately 150ms after the voltage exceeds the threshold (2.31V). This ensures the clock and power supply have stabilized. 2. **Brownout Detection:** If the supply voltage drops below the 2.31V threshold, the `RESET` pin immediately goes low to prevent the processor from executing corrupted instructions. 3. **Active Low Push-Pull Output:** Unlike "Open-Drain" versions, this "Push-Pull" version does not require an external pull-up resistor. It can actively drive the reset line high or low. --- ### 3. Pin Configuration | Pin Number | Name | Description | | :---: | :--- | :--- | | 1 | **RESET** | Output: Logic low when Vcc is below threshold. | | 2 | **Vcc** | Input: Power supply to be monitored. | | 3 | **GND** | Ground. | --- ### 4. Part Number Breakdown The suffix code provides specific details about the variation: * **R23:** Represents the reset threshold voltage (2.31V). * **ART:** Specifies the package type (SOT-23). * **RL7:** Indicates "Tape and Reel" packaging with a 7-inch reel size. --- ### 5. Application Circuit Example The ADM1815 requires minimal external components. A simple decoupling capacitor is recommended for the Vcc line. ```c // Typical Connection [ Power Rail (2.5V/3.3V) ] ---+--- [ Vcc (Pin 2) ] | [C=0.1uF] | [ Ground ] -------------------+--- [ GND (Pin 3) ] [ RESET (Pin 1) ] --------------> [ MCU Reset Pin ] ``` ---