Overview
The STM1815RWX7F is a low-power reset circuit produced by STMicroelectronics. It is designed to monitor power supplies for microcontrollers and assert a reset signal when the supply voltage drops below a preset threshold. This component is part of the STM181x family, which offers various configurations to suit different application needs.
The device is housed in a 3-pin SOT23 package, making it ideal for space-constrained and portable equipment. It operates over a wide temperature range from –40 °C to 105 °C and is fully compatible with other similar products like DS181x and MXD181x.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SOT23-3 |
| Reset Output Configuration | Active-Low, Push-Pull |
| Reset Threshold Voltage | 2.55 V, 2.88 V, 3.06 V, 4.37 V, 4.62 V (typ) |
| Minimum Reset Pulse Width | 100 ms |
| Supply Current | 4 µA (typ) |
| Operating Temperature Range | –40 °C to 105 °C |
| Reset Threshold Accuracy | ± 2.5 % (–40 °C to 105 °C) |
| Power Supply Transient Immunity | Yes |
| Manual Reset Detect | No (specific to STM1815, but available in other models like STM1813/1818) |
Key Features
- Precision monitoring of 3 V, 3.3 V, and 5 V supply voltages
- Low supply current of 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
- Available in push-pull and open-drain output configurations
- Internal pull-up resistor for open-drain devices
- Manual reset detect with debounce circuitry (available in STM1813/1818 models)
Applications
The STM1815RWX7F is suitable for a variety of applications where reliable power supply monitoring is crucial. These include:
- Portable electronic devices
- Embedded systems requiring low power consumption
- Microcontroller-based systems needing precise reset functionality
- Automotive and industrial control systems
- Consumer electronics requiring robust power management
Q & A
- What is the primary function of the STM1815RWX7F?
The primary function of the STM1815RWX7F is to monitor the power supply voltage and assert a reset signal to the microcontroller if the voltage drops below a preset threshold.
- What is the package type of the STM1815RWX7F?
The STM1815RWX7F is housed in a 3-pin SOT23 package.
- What are the available reset threshold voltages for the STM1815RWX7F?
The available reset threshold voltages are 2.55 V, 2.88 V, 3.06 V, 4.37 V, and 4.62 V (typ).
- What is the minimum reset pulse width for the STM1815RWX7F?
The minimum reset pulse width is 100 ms.
- Does the STM1815RWX7F have manual reset detect capability?
No, the STM1815RWX7F does not have manual reset detect capability, but this feature is available in other models like the STM1813 and STM1818.
- What is the operating temperature range of the STM1815RWX7F?
The operating temperature range is –40 °C to 105 °C.
- How accurate is the reset threshold of the STM1815RWX7F?
The reset threshold accuracy is ± 2.5 % over the temperature range of –40 °C to 105 °C.
- Is the STM1815RWX7F immune to power supply transients?
Yes, the STM1815RWX7F is designed to be immune to power supply transients.
- What is the typical supply current of the STM1815RWX7F?
The typical supply current is 4 µA.
- Is the STM1815RWX7F compatible with other similar products?
Yes, it is fully compatible with products like DS181x and MXD181x.
