Overview
The STWD100NYWY3F 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, such as bad code jumps and code loops. The STWD100NYWY3F features an input (WDI) to clear the internal watchdog timer periodically and an output (WDO) that asserts if the system fails to reset the timer within the specified timeout period. It also includes an enable pin (EN) to control the watchdog functionality.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Current Consumption | 13 µA (typ.) | µA |
| Watchdog Timeout Periods | 3.4 ms, 6.3 ms, 102 ms, 1.6 s | ms/s |
| Operating Temperature Range | –40 to 125 °C | °C |
| Packages | SOT23-5, SC70-5 (SOT323-5) | |
| ESD Performance | HBM: 2000 V, CDM: 1000 V | V |
| Supply Voltage | –0.3 to 7.0 V | V |
| Input or Output Voltage | –0.3 to VCC + 0.3 V | V |
| Output Current | 20 mA | mA |
| Power Dissipation | 320 mW | mW |
Key Features
- Current consumption: 13 µA (typ.)
- Available watchdog timeout periods: 3.4 ms, 6.3 ms, 102 ms, and 1.6 s
- Chip enable input (EN) with internal pull-down resistor
- Open drain or push-pull WDO output
- Operating temperature range: –40 to 125 °C
- Packages: SOT23-5 and SC70-5 (SOT323-5)
- ESD performance: HBM: 2000 V, CDM: 1000 V
- Automotive qualified (AEC Q100)
Applications
- Telecommunications
- Alarm systems
- Industrial equipment
- Networking
- Medical equipment
- UPS (uninterruptible power supply)
- Automotive systems
Q & A
- What is the primary function of the STWD100NYWY3F? The primary function is to prevent system failures caused by hardware or software errors by monitoring and resetting the system if the watchdog timer is not periodically cleared.
- What are the available watchdog timeout periods for the STWD100NYWY3F? 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 STWD100NYWY3F? The typical current consumption is 13 µA.
- What are the operating temperature ranges for the STWD100NYWY3F? The operating temperature range is –40 to 125 °C.
- What types of packages are available for the STWD100NYWY3F? The device is available in SOT23-5 and SC70-5 (SOT323-5) packages.
- Is the STWD100NYWY3F automotive qualified? Yes, it is automotive qualified according to AEC Q100 standards.
- How does the enable pin (EN) function on the STWD100NYWY3F? The enable pin (EN) can enable or disable the watchdog functionality. The device is enabled if the EN pin is left floating due to the internal pull-down resistor.
- What is the ESD performance of the STWD100NYWY3F? The ESD performance is HBM: 2000 V and CDM: 1000 V.
- What are some common applications of the STWD100NYWY3F? Common applications include telecommunications, alarm systems, industrial equipment, networking, medical equipment, UPS systems, and automotive systems.
- How does the watchdog output (WDO) work on the STWD100NYWY3F? The watchdog output (WDO) is asserted if the system fails to reset the watchdog timer within the specified timeout period. It can be configured as either open drain or push-pull output.
