Overview
The STWD100NWWY3F is a watchdog timer circuit produced by STMicroelectronics. This self-contained device is designed to prevent system failures caused by hardware errors, such as non-responding peripherals and bus contention, or software errors, such as bad code jumps and code loops. The STWD100NWWY3F features an input, WDI, and an output, WDO, and includes an enable pin, EN, to control the watchdog functionality. The device operates by requiring periodic toggles of the WDI input within the specified watchdog timeout period to prevent system alerts and resets.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | SOT23-5 | - |
| Watchdog Timeout Periods | Available periods | 3.4 ms, 6.3 ms, 102 ms, 1.6 s |
| Current Consumption | Typical current consumption | 13 µA |
| Operating Temperature Range | Temperature range | –40 to 125 °C |
| ESD Performance | HBM and CDM ratings | HBM: 2000 V, CDM: 1000 V |
| Watchdog Output | Output configuration | Open drain or push-pull |
| Enable Pin | Enable pin functionality | Chip enable input |
| Supply Voltage | VCC range | 2.7 V to 5.5 V |
Key Features
- Current Consumption: Typical current consumption of 13 µA.
- Watchdog Timeout Periods: Available periods of 3.4 ms, 6.3 ms, 102 ms, and 1.6 s.
- Output Configuration: Watchdog output available in open drain or push-pull configuration.
- Enable Pin: Chip enable input to enable or disable the watchdog functionality.
- Operating Temperature Range: –40 to 125 °C.
- ESD Performance: HBM: 2000 V, CDM: 1000 V.
- Automotive Qualified: Qualified according to AEC Q100 and Q003 or equivalent standards.
Applications
- Telecommunications: Used in telecommunications equipment.
- Alarm Systems: Integrated into alarm systems for reliability.
- Industrial Equipment: Utilized in various industrial applications.
- Networking: Employed in networking devices.
- Medical Equipment: Used in medical devices for safety and reliability.
- UPS (Uninterruptible Power Supply): Implemented in UPS systems.
- Automotive: Qualified for automotive applications.
Q & A
- What is the primary function of the STWD100NWWY3F?
The primary function of the STWD100NWWY3F is to prevent system failures caused by hardware or software errors by monitoring and resetting the system if the watchdog input is not toggled within the specified timeout period.
- What are the available watchdog timeout periods for the STWD100NWWY3F?
The available watchdog timeout periods are 3.4 ms, 6.3 ms, 102 ms, and 1.6 s.
- What is the typical current consumption of the STWD100NWWY3F?
The typical current consumption is 13 µA.
- What are the ESD performance ratings of the STWD100NWWY3F?
The ESD performance ratings are HBM: 2000 V and CDM: 1000 V.
- What is the operating temperature range of the STWD100NWWY3F?
The operating temperature range is –40 to 125 °C.
- Can the watchdog output be configured in different modes?
Yes, the watchdog output can be configured as either open drain or push-pull.
- How does the enable pin (EN) function in the STWD100NWWY3F?
The enable pin (EN) can enable or disable the watchdog functionality. The device is enabled if the EN pin is left floating.
- What are some common applications of the STWD100NWWY3F?
Common applications include telecommunications, alarm systems, industrial equipment, networking, medical equipment, UPS systems, and automotive applications.
- Is the STWD100NWWY3F qualified for automotive use?
Yes, the STWD100NWWY3F is qualified according to AEC Q100 and Q003 or equivalent standards for automotive applications.
- What is the supply voltage range for the STWD100NWWY3F?
The supply voltage range is 2.7 V to 5.5 V.
