Overview
The STWD100NXWY3F is a self-contained watchdog timer circuit produced by STMicroelectronics. This device is designed to prevent system failures caused by hardware errors such as non-responding peripherals and bus contention, or software errors like bad code jumps and code loops. The watchdog timer ensures that the system remains operational by periodically resetting the watchdog input within a specified timeout period. If the system fails to reset the watchdog, it generates a system alert and asserts the watchdog output.
Key Specifications
| Attribute | Value | Unit |
|---|---|---|
| Package Style | SOT23-5 (SOT-25) | |
| Mounting Method | Surface Mount | |
| Current Consumption | 13 | µA (typical) |
| Watchdog Timeout Periods | 3.4 ms, 6.3 ms, 102 ms, 1.6 s | |
| Chip Enable Input | Yes | |
| Watchdog Output (WDO) | Open drain or push-pull | |
| Operating Temperature Range | –40 to +125 | °C |
| ESD Performance | HBM: 2000 V, CDM: 1000 V | |
| Supply Voltage | 2.7 to 5.5 | V |
| Output Current | 20 | mA |
| Power Dissipation | 320 | mW |
Key Features
- Current consumption of 13 µA (typical)
- Available watchdog timeout periods: 3.4 ms, 6.3 ms, 102 ms, and 1.6 s
- Chip enable input (EN) to enable or disable the watchdog functionality
- Open drain or push-pull watchdog output (WDO)
- Operating temperature range: –40°C to +125°C
- ESD performance: HBM 2000 V, CDM 1000 V
- Automotive qualified
Applications
- Telecommunications
- Alarm systems
- Industrial equipment
- Networking
- Medical equipment
- Uninterruptible Power Supply (UPS)
- Automotive systems
Q & A
- What is the primary function of the STWD100NXWY3F?
The primary function of the STWD100NXWY3F is to prevent system failures caused by hardware or software errors by acting as a watchdog timer.
- What are the available watchdog timeout periods for the STWD100NXWY3F?
The available watchdog timeout periods are 3.4 ms, 6.3 ms, 102 ms, and 1.6 s.
- How does the chip enable input (EN) work on the STWD100NXWY3F?
The chip enable input (EN) allows the watchdog functionality to be enabled or disabled. If the EN pin is left floating, the device is enabled due to the internal pull-down resistor.
- What is the operating temperature range of the STWD100NXWY3F?
The operating temperature range is –40°C to +125°C.
- What types of outputs does the STWD100NXWY3F have?
The STWD100NXWY3F has an open drain or push-pull watchdog output (WDO).
- What is the typical current consumption of the STWD100NXWY3F?
The typical current consumption is 13 µA.
- What are the ESD performance ratings for the STWD100NXWY3F?
The ESD performance ratings are HBM 2000 V and CDM 1000 V.
- Is the STWD100NXWY3F automotive qualified?
Yes, the STWD100NXWY3F is automotive qualified.
- What are some common applications for the STWD100NXWY3F?
Common applications include telecommunications, alarm systems, industrial equipment, networking, medical equipment, UPS, and automotive systems.
- What package styles are available for the STWD100NXWY3F?
The STWD100NXWY3F is available in SOT23-5 and SC70-5 (SOT323-5) package styles.
