STM6821TWY6F

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power management
• Characteristics: High efficiency, low power consumption
• Package: SOT-23-6
• Essence: Voltage supervisor with manual reset input
• Packaging/Quantity: Tape and reel, 3000 units per reel

Specifications

• Supply Voltage Range: 2.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Reset Threshold Voltage Options: 2.93V, 3.08V, 4.38V, 4.63V
• Manual Reset Input: Active-low, open-drain output
• Power-On Reset Delay: 100ms typical
• Watchdog Timer: Adjustable timeout period
• Quiescent Current: 10µA typical
• Output Type: Push-pull or open-drain
• RoHS Compliance: Yes

Pin Configuration

The STM6821TWY6F IC has a total of 6 pins arranged as follows:

```

---

| | --| VDD GND |-- Pin 1: Ground (GND) --| MR RST |-- Pin 2: Manual Reset Input (MR) --| WDI VDD |-- Pin 3: Watchdog Timer Input (WDI) --| NC RST |-- Pin 4: Not Connected (NC) --| RST VDD |-- Pin 5: Reset Output (RST) --| VDD GND |-- Pin 6: Supply Voltage (VDD) |___________| ```

Functional Features

1. Voltage Supervision: Monitors the supply voltage and generates a reset signal when it falls below the specified threshold.
2. Manual Reset Input: Allows external control to initiate a system reset.
3. Watchdog Timer: Provides a mechanism to detect and recover from software or hardware failures by resetting the system if a periodic input signal is not received within the timeout period.
4. Adjustable Reset Threshold: Offers flexibility in selecting the desired voltage level at which the reset signal is triggered.
5. Low Power Consumption: Operates with minimal power consumption, making it suitable for battery-powered applications.

Advantages

• Reliable voltage supervision ensures proper system operation.
• Manual reset input allows for manual control over system resets.
• Adjustable reset threshold accommodates different voltage requirements.
• Low power consumption prolongs battery life in portable devices.
• Small package size (SOT-23-6) enables space-efficient designs.

Disadvantages

• Limited number of available reset threshold voltage options.
• Lack of built-in hysteresis may result in potential noise-related issues.
• Not suitable for high-voltage applications due to its limited supply voltage range.

Working Principles

The STM6821TWY6F operates by continuously monitoring the supply voltage. When the voltage drops below the set threshold, the IC generates a reset signal to ensure a controlled system restart. The manual reset input provides an additional means to trigger a reset externally. The watchdog timer feature detects failures by monitoring the periodic input signal, and if no signal is received within the timeout period, it initiates a system reset.

Application Field Plans

The STM6821TWY6F finds application in various fields, including:

1. Embedded Systems: Used to monitor and reset microcontrollers and other digital systems.
2. Battery-Powered Devices: Ensures safe operation and extends battery life in portable electronics.
3. Industrial Automation: Provides reliable voltage supervision in control systems.
4. Automotive Electronics: Used for voltage monitoring and system reset in automotive applications.
5. Telecommunications: Ensures proper operation of communication equipment.

Alternative Models

1. MAX6821: Similar functionality, available in different package options.
2. MIC803: Offers additional features like power-on reset delay and adjustable watchdog timeout.
3. TC54: Provides a wider range of reset threshold voltage options.
4. TL7705: Suitable for higher supply voltage applications.
5. ADM6315: Includes built-in hysteresis for improved noise immunity.

These alternative models offer similar functionality to the STM6821TWY6F and can be considered based on specific application requirements.

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