Overview
The STM1001SWX6F from STMicroelectronics is a low-power supervisory device designed to monitor power supplies and assert a reset signal to a microcontroller when the supply voltage drops below a preset threshold. This device is encapsulated in a small SOT23-3 package, making it suitable for space-constrained applications. The STM1001 performs a critical function in ensuring the stable operation of microprocessors by providing a reliable reset mechanism during power-up and power-down cycles.
Key Specifications
| Parameter | Description | Value | Unit |
|---|---|---|---|
| VCC Operating Voltage | Operating voltage range | 1.2 to 5.5 | V |
| ICC Supply Current | Typical supply current at VCC < 3.6 V | 6 | µA |
| VRST Reset Threshold | Reset threshold voltage (varies by version) | L: 4.50-4.75 V, M: 4.25-4.50 V, T: 3.00-3.15 V, S: 2.85-3.00 V, R: 2.55-2.70 V | V |
| trec RST Pulse Width | Reset pulse width (varies by option) | B: 20-40 ms, Blank: 140-280 ms | ms |
| Operating Temperature | Industrial operating temperature range | –40 to 85 | °C |
| Package Type | Package type | SOT23-3 |
Key Features
- Precision Monitoring: Monitors 3 V, 3.3 V, and 5 V supply voltages with precise reset thresholds.
- Low Power Consumption: Typical supply current of 6 µA, making it suitable for low-power applications.
- Open Drain RST Output: The reset output is an open drain, requiring a pull-up resistor.
- Guaranteed RST Assertion: Ensures the reset signal is valid down to VCC = 1 V.
- Transient Immunity: Immune to negative-going VCC transients, with additional immunity provided by a 0.1 µF bypass capacitor.
- Compact Package: Available in a small SOT23-3 package, ideal for space-constrained designs.
Applications
The STM1001SWX6F is widely used in various applications where reliable power supply monitoring and reset functionality are crucial. These include:
- Microcontroller and microprocessor systems
- Embedded systems requiring power-on reset (PoR) functionality
- Industrial control systems
- Automotive electronics
- Consumer electronics requiring robust power management
Q & A
- What is the primary function of the STM1001SWX6F?
The primary function of the STM1001SWX6F is to monitor the power supply voltage and assert a reset signal to the microcontroller if the voltage drops below a preset threshold.
- What are the different reset threshold voltage options available for the STM1001?
The STM1001 is available with various reset threshold voltages: L (4.50-4.75 V), M (4.25-4.50 V), T (3.00-3.15 V), S (2.85-3.00 V), and R (2.55-2.70 V).
- What is the typical supply current of the STM1001SWX6F?
The typical supply current is 6 µA.
- What type of package does the STM1001SWX6F come in?
The STM1001SWX6F comes in a SOT23-3 package.
- What is the operating temperature range of the STM1001SWX6F?
The operating temperature range is –40 to 85 °C.
- How does the STM1001SWX6F handle negative-going VCC transients?
The device is relatively immune to negative-going VCC transients, and additional immunity can be provided by a 0.1 µF bypass capacitor.
- What are the reset pulse width options for the STM1001SWX6F?
The reset pulse width options are 20-40 ms (Option B) and 140-280 ms (Option Blank).
- Why is the RST output of the STM1001SWX6F an open drain?
The RST output is an open drain, which requires a pull-up resistor to ensure proper operation.
- What is the significance of the guaranteed RST assertion down to VCC = 1 V?
This ensures that the reset signal remains valid even at low supply voltages, ensuring reliable operation of the microcontroller.
- In which types of applications is the STM1001SWX6F commonly used?
The STM1001SWX6F is commonly used in microcontroller and microprocessor systems, embedded systems, industrial control systems, automotive electronics, and consumer electronics.
