STM1815SWX7F

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: Low-power voltage supervisor with manual reset input
• Package: SOT-23-5
• Essence: The STM1815SWX7F is a voltage supervisor IC designed to monitor the power supply voltage of electronic systems and provide a reset signal when the voltage falls below a certain threshold.
• Packaging/Quantity: The STM1815SWX7F is available in a SOT-23-5 package, and it is typically sold in reels of 3000 units.

Specifications

• Supply Voltage Range: 1.6V to 5.5V
• Threshold Voltage Options: 2.93V, 3.08V, 3.15V, 3.30V, 4.38V, 4.63V, 4.75V, 4.88V
• Manual Reset Input: Active-low input for manual system reset
• Reset Timeout Period: Adjustable using an external capacitor
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The STM1815SWX7F has five pins arranged as follows:

```

---

| | --| VDD GND |-- Pin 1: Supply Voltage (VDD) --| RESET OUT |-- Pin 2: Reset Output --| MR |-- Pin 3: Manual Reset Input --| GND VDD |-- Pin 4: Ground (GND) |___________| ```

Functional Features

• Monitors the power supply voltage and generates a reset signal when the voltage drops below the set threshold.
• Provides a manual reset input for immediate system reset.
• Adjustable reset timeout period allows customization of the reset duration.
• Low quiescent current consumption, making it suitable for battery-powered applications.
• Built-in hysteresis ensures stable reset operation even in noisy environments.

Advantages and Disadvantages

Advantages: - Compact SOT-23-5 package for space-constrained designs. - Wide supply voltage range enables compatibility with various systems. - Adjustable threshold voltage options provide flexibility for different voltage monitoring requirements. - Low-power consumption extends battery life in portable devices. - Manual reset input offers additional control over system reset.

Disadvantages: - Limited number of threshold voltage options may not cover all voltage monitoring scenarios. - External capacitor required for setting the reset timeout period, adding complexity to the design.

Working Principles

The STM1815SWX7F operates by continuously monitoring the supply voltage. When the voltage falls below the set threshold, the reset output is activated, indicating a power failure or unstable voltage condition. The manual reset input allows the system to be reset immediately, regardless of the voltage level. The reset timeout period can be adjusted using an external capacitor, determining how long the reset signal remains active after the voltage returns to normal.

Detailed Application Field Plans

The STM1815SWX7F is widely used in various electronic systems where reliable power supply monitoring and system reset functionality are crucial. Some application fields include:

1. Embedded Systems: Used in microcontroller-based systems to ensure proper initialization and safe operation upon power-up or voltage fluctuations.
2. Industrial Automation: Employed in industrial control systems to monitor power supply integrity and initiate system resets in case of voltage anomalies.
3. Consumer Electronics: Integrated into smart home devices, wearables, and IoT devices to maintain stable operation and prevent data corruption during power disturbances.
4. Automotive Electronics: Utilized in automotive control units to monitor vehicle power supply and trigger system resets to ensure safe operation.

Detailed and Complete Alternative Models

1. STM1813SWX7F: Similar to STM1815SWX7F but with a different pin configuration (SOT-23-6 package).
2. MAX823L: Voltage supervisor IC from Maxim Integrated with adjustable threshold voltage options (SOT-23-5 package).
3. MIC803: Low-power voltage supervisor IC from Microchip Technology with manual reset input (SOT-23-5 package).

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