The **ADM6346-40ARTZ-R7** is a low-power, precision microprocessor supervisory circuit manufactured by **Analog Devices**. Its primary function is to monitor power supply voltages and provide a reset signal to a processor during power-up, power-down, and brownout conditions. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Reset Threshold** | 4.0V (Fixed) | | **Output Type** | Open-Drain, Active-Low | | **Supply Current** | 1 µA (Typical) - Ultra-low power | | **Reset Timeout** | 100 ms (Minimum) | | **Package** | SOT-23 (3-lead) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Functional Overview This device acts as a "watchdog" for the system voltage. It ensures that the microprocessor does not start executing code until the power supply is stable and within the required operating range. #### A. Power-On Reset (POR) When the system is first powered on, the ADM6346 keeps the `RESET` line low. Once the supply voltage ($V_{CC}$) exceeds the 4.0V threshold, a timer starts. After 100ms, the `RESET` signal goes high (inactive), allowing the CPU to boot. #### B. Brownout Protection If $V_{CC}$ drops below 4.0V during operation, the device immediately pulls the `RESET` line low. This prevents the processor from executing corrupted instructions due to insufficient voltage. --- ### 3. Pin Configuration | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **GND** | Ground reference. | | 2 | **RESET** | Active-low output. Remains low if $V_{CC}$ < Threshold. | | 3 | **Vcc** | Supply voltage input and monitored voltage. | --- ### 4. Circuit Implementation Details * **Open-Drain Architecture:** Since the output is open-drain, it requires an external **pull-up resistor** connected to a voltage source (usually the same $V_{CC}$ or the I/O voltage of the processor). * **Glitch Immunity:** The device is designed to ignore very short glitches on the $V_{CC}$ line to prevent "nuisance" resets. * **Low Power Consumption:** With a typical current draw of only 1 µA, it is ideal for battery-operated handheld devices. --- ### 5. Part Number Breakdown * **ADM6346:** Series model (Low power supervisor). * **40:** Denotes the 4.0V threshold. * **ARTZ:** Refers to the SOT-23 package and RoHS compliance. * **R7:** Indicates the packaging format (7-inch Reel, 3000 pieces).