The **ADM6346-45ARTZ-R7** is a precision voltage monitoring device manufactured by Analog Devices. It is primarily used as a microprocessor supervisory circuit to monitor power supplies and provide a reliable reset signal during power-up, power-down, and brownout conditions. --- ### 1. Key Technical Specifications The part number itself reveals specific technical details: | Parameter | Specification | | :--- | :--- | | **Threshold Voltage** | 4.50V (Typical) | | **Output Type** | Active-Low, Open-Drain | | **Package** | 3-lead SOT-23 | | **Supply Current** | Very Low (approx. 1 µA) | | **Reset Timeout** | 100 ms (Minimum) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Core Functional Components The internal architecture consists of several critical electronic segments: * **Precision Voltage Reference:** An internal bandgap reference that determines the accuracy of the 4.5V threshold. * **Comparator:** Compels the device to trigger a reset when $V_{CC}$ drops below the specified threshold. * **Open-Drain Output:** The output is an N-channel MOSFET. This requires an external **pull-up resistor** to connect to a voltage rail (usually $V_{CC}$ or a different logic level). * **Glitch Immunity:** The device includes internal filtering to prevent negative-going $V_{CC}$ transients (noise) from triggering a false reset. --- ### 3. Application Circuit Example Because the device is an open-drain configuration, the connection to a Microcontroller (MCU) typically looks like this: ```c // Connection Logic: // [VCC] ----+---- [VCC Pin] // | // [Resistor] (10k - 100k Ohms) // | // +---- [RESET Pin] ---- [MCU RESET Input] // | // [GND] ----+---- [GND Pin] ``` ### 4. Part Number Breakdown * **ADM6346:** Series Name (Ultra-low current monitoring circuit). * **45:** Represents the 4.5V threshold. * **ARTZ:** Refers to the SOT-23 package and "Z" indicates RoHS compliance (Lead-free). * **R7:** Indicates the packaging format (7-inch Reel, 3000 pieces). --- ### 5. Common Use Cases * **Microprocessor Systems:** To ensure the CPU starts at a valid voltage. * **Critical Controllers:** To prevent erratic code execution during power dips. * **Battery Powered Equipment:** Due to its extremely low current consumption (1 µA), it preserves battery life.