The **ADM6328-28ARTZ-R7** is a precision voltage monitoring device manufactured by Analog Devices. It is primarily used to monitor power supply levels in microprocessor-based systems and initiate a reset during power-up, power-down, and brownout conditions. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Threshold Voltage** | 2.8V | | **Supply Current** | 1.0 $\mu$A (Typical) | | **Output Type** | Open-Drain, Active-Low | | **Reset Timeout Period** | 100 ms (Minimum) | | **Operating Temperature** | -40°C to +85°C | | **Package / Case** | SOT-23-3 | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Functional Description The device acts as a "watchdog" for the system's power supply. Here is how it operates: * **Monitoring:** It continuously monitors the $V_{CC}$ pin. * **Triggering:** When $V_{CC}$ falls below the preset threshold (2.8V in this specific model), the **RESET** output is asserted (pulled low). * **Delay Logic:** Once $V_{CC}$ rises back above the threshold, the device keeps the RESET signal active for a fixed "timeout period" (approx. 100ms to 280ms). This ensures the power supply has stabilized before the microprocessor starts executing code. * **Output Architecture:** Since it is **Open-Drain**, it requires an external pull-up resistor to the desired logic voltage level. --- ### 3. Pin Configuration | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **RESET** | Active-Low Output. Open-drain logic. | | 2 | **Vcc** | Power Supply Input / Monitored Voltage. | | 3 | **GND** | Ground. | --- ### 4. Typical Applications * **Microprocessor Systems:** Ensuring a clean start-up. * **Computers/Controllers:** Preventing data corruption during power fluctuations. * **Intelligent Instruments:** Monitoring battery levels. * **Portable Equipment:** Due to its ultra-low current consumption (1 $\mu$A), it is ideal for battery-operated devices. --- ### 5. Decoding the Part Number * **ADM6328:** The base model family. * **28:** Represents the 2.8V threshold voltage. * **ARTZ:** Refers to the SOT-23 package and RoHS compliance. * **R7:** Indicates the packaging format (7-inch Tape and Reel, typically 3,000 units).