## Overview of ADM1816-R22ARTZ-RL7 The **ADM1816-R22ARTZ-RL7** is a microprocessor supervisory circuit manufactured by Analog Devices. It is designed to monitor power supply voltages in microprocessor systems and provide a reset signal to the processor during power-up, power-down, and brownout conditions. --- ### Core Specifications Below are the primary technical characteristics of the ADM1816 series: | Parameter | Specification | | :--- | :--- | | **Reset Threshold Voltage** | 3.06V (typical) | | **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 / Case** | SOT-23-3 | --- ### Key Electronic Components & Features #### 1. Voltage Monitor (Threshold) The device continuously monitors the $V_{CC}$ pin. The suffix **R22** indicates the threshold voltage. For this specific part, the reset is triggered when the supply voltage falls below approximately **3.06V**. #### 2. Reset Generator When the monitored voltage drops below the threshold, the `RESET` pin is asserted. Once the voltage rises back above the threshold plus hysteresis, the device keeps the reset signal active for a "Timeout Period" (150ms) to allow the system clock and power to stabilize. #### 3. Open-Drain Output The **ADM1816** features an **Open-Drain** output. - **Requirement:** It requires an external pull-up resistor (typically 10kΩ to 100kΩ) connected to a voltage source. - **Advantage:** This allows for "Wired-OR" connections where multiple reset sources can trigger the same line. #### 4. Low Power Consumption The internal circuitry is optimized for low current consumption (typically around 10µA), making it ideal for battery-powered or energy-sensitive applications. --- ### Pin Configuration (SOT-23) | Pin No. | Name | Function | | :--- | :--- | :--- | | 1 | **RESET** | Active-low output. Remains low while $V_{CC}$ is below threshold. | | 2 | **Vcc** | Power supply input and monitored voltage. | | 3 | **GND** | Ground reference. | --- ### Application Usage - **Microprocessor Systems:** Prevents the CPU from executing code during unstable power states. - **Intelligent Instruments:** Protects data integrity during power failures. - **Automotive Systems:** High-temperature rating allows for use in engine control or infotainment units.