Overview
The STM1818SWX7F is a low-power reset circuit device produced by STMicroelectronics. It is designed to monitor power supplies for microcontrollers, ensuring that the system operates reliably by asserting a reset signal when the supply voltage drops below a predefined threshold. This device is part of the STM181x family, which offers various output configurations and reset threshold options, making it versatile for different application needs.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Supply Voltage Range | Operating voltage range | 1.0 V to 5.5 V |
| Reset Thresholds | Available reset thresholds | 2.55 V, 2.88 V, 3.06 V, 4.37 V, 4.62 V (typ.) |
| Reset Pulse Width | Minimum reset pulse width | 100 ms |
| Supply Current | Typical supply current at VCC = 3.6 V | 4 µA |
| Output Configuration | Output type for STM1818 | Open-drain, active-low with push-button/manual reset detect |
| Operating Temperature | Temperature range for operation | –40 °C to 105 °C |
| Package | Package type | SOT23-3 |
| Reset Threshold Accuracy | Accuracy of reset threshold | ± 2.5% (–40 °C to 105 °C) |
Key Features
- Precision monitoring of 3 V, 3.3 V, and 5 V supply voltages
- Four output configurations: push-pull active-high, push-pull active-low, open-drain active-low, and open-drain active-low with push-button/manual reset detect
- Low supply current - 4 µA (typ.)
- Guaranteed assertion down to VCC = 1.0 V (0 °C to 105 °C)
- Factory-trimmed reset thresholds with ± 2.5% accuracy
- Power supply transient immunity
- Push-button/manual reset detect feature (for STM1818)
- Available in the SOT23-3 package
- Fully compatible with DS181x and MXD181x products
Applications
The STM1818SWX7F is ideal for use in various applications where reliable power supply monitoring is crucial, such as:
- Portable electronic devices
- Microcontroller-based systems
- Embedded systems requiring power-up, power-down, and brownout protection
- Industrial control systems
- Automotive electronics
Q & A
- What is the primary function of the STM1818SWX7F?
The primary function is to monitor the power supply voltage and assert a reset signal to the microcontroller if the voltage drops below a predefined threshold.
- What are the available reset thresholds for the STM1818SWX7F?
The available reset thresholds are 2.55 V, 2.88 V, 3.06 V, 4.37 V, and 4.62 V.
- What is the minimum reset pulse width for the STM1818SWX7F?
The minimum reset pulse width is 100 ms.
- How much current does the STM1818SWX7F typically consume?
The device typically consumes 4 µA of supply current at VCC = 3.6 V.
- What is the operating temperature range for the STM1818SWX7F?
The operating temperature range is –40 °C to 105 °C.
- What package type is the STM1818SWX7F available in?
The device is available in the SOT23-3 package.
- Does the STM1818SWX7F have a manual reset feature?
- Is the STM1818SWX7F compatible with other reset devices?
- What is the accuracy of the reset threshold for the STM1818SWX7F?
The reset threshold accuracy is ± 2.5% over the temperature range of –40 °C to 105 °C.
- Does the STM1818SWX7F have power supply transient immunity?
