The **ADM6346-37ARTZ-R7** is a low-power, precision microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It primarily functions as a "reset generator" to ensure that a system starts or restarts under controlled voltage conditions. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the ADM6346-37ARTZ-R7: | Parameter | Specification | | :--- | :--- | | **Threshold Voltage ($V_{TH}$)** | 3.70V (Typical) | | **Supply Current ($I_{CC}$)** | 1 µA (Typical) - Ultra Low Power | | **Output Type** | Open-Drain, Active-Low ($\overline{RESET}$) | | **Reset Timeout Period** | 100 ms (Minimum) | | **Operating Voltage Range** | 1.0V to 5.5V | | **Package / Case** | SOT-23-3 (Surface Mount) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Core Functional Components The internal architecture consists of several critical electronic stages: #### A. Precision Voltage Reference and Comparator The chip contains an internal bandgap reference and a comparator. It continuously monitors the $V_{CC}$ pin. When the supply voltage falls below the factory-set threshold (3.70V in this specific model), the comparator triggers the reset logic. #### B. Delay Timer (Reset Timeout) Once $V_{CC}$ rises above the threshold, the device does not release the reset signal immediately. It waits for a fixed duration (minimum 100ms). This "Timeout Period" ensures that the power supply has stabilized and the system clock is running before the microprocessor begins execution. #### C. Open-Drain Output Stage The output is an **Open-Drain** configuration. This means: * It requires an external **pull-up resistor** connected to a voltage source (usually $V_{CC}$ or the logic level of the CPU). * It allows for "Wired-OR" logic, where multiple reset sources can be connected to the same reset line. --- ### 3. Pin Configuration The device uses a compact 3-pin SOT-23 package: 1. **GND**: Ground reference. 2. **$\overline{RESET}$**: The active-low output signal. It stays LOW if $V_{CC}$ is below the threshold or during the timeout period. 3. **$V_{CC}$**: The power supply input and the voltage being monitored. --- ### 4. Application Circuit Example To use this part, a pull-up resistor (typically 10kΩ to 100kΩ) is placed between the $\overline{RESET}$ pin and the logic supply. ```text Vcc (3.7V+) | [Pull-up Resistor] | +------> To Microcontroller RESET Pin | [Pin 2: RESET] ADM6346-37 [Pin 1: GND] ----> Ground [Pin 3: Vcc] ----> Main Supply Line ``` --- ### 5. Part Number Breakdown * **ADM6346**: The base series (Low power, Open-drain output). * **37**: Indicates the 3.70V nominal threshold voltage. * **ARTZ**: Refers to the SOT-23 package and Lead-Free (RoHS) status. * **R7**: Indicates the Tape and Reel packaging size (7-inch reel).