Overview
The TPS3431SDRBR, produced by Texas Instruments, is a standard programmable watchdog timer with an enable feature. This device is designed for a wide variety of applications, particularly those requiring high-precision timing and watchdog functionality. The TPS3431 features a ±2.5% accurate watchdog timeout at 25°C and can operate over a junction temperature range of –40°C to +125°C. It is available in a compact 3-mm × 3-mm, 8-pin VSON package, making it suitable for space-constrained designs.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | 1.8 V to 6.5 V |
| Watchdog Timeout Accuracy | ±2.5% typical at 25°C |
| Quiescent Current | 10 µA (typical) |
| Output Type | Active-low open-drain |
| Enable Input | EN pin |
| Enable Output | ENOUT pin |
| Package Type | 3-mm × 3-mm, 8-pin VSON |
| Junction Operating Temperature Range | –40°C to +125°C |
Key Features
- Factory-programmed precision watchdog timers with ±2.5% accuracy typical at 25°C
- User-programmable watchdog timeout using an external capacitor or factory-programmed default delay settings
- Watchdog disable feature via the Enable pin or SET logic pins
- Low quiescent current: 10 µA (typical)
- Active-low open-drain output
- Enable input (EN) and enable output (ENOUT)
- Compact 3-mm × 3-mm, 8-pin VSON package
Applications
The TPS3431 is suitable for a wide range of applications, including but not limited to:
- Microcontroller (MCU) systems requiring watchdog timer functionality
- Industrial control systems
- Automotive systems
- Medical devices
- Consumer electronics
Q & A
- What is the input voltage range of the TPS3431?
The input voltage range of the TPS3431 is from 1.8 V to 6.5 V. - How accurate is the watchdog timeout of the TPS3431?
The watchdog timeout of the TPS3431 has an accuracy of ±2.5% typical at 25°C. - What is the quiescent current of the TPS3431?
The quiescent current of the TPS3431 is 10 µA (typical). - What type of output does the TPS3431 have?
The TPS3431 has an active-low open-drain output. - How can the watchdog timer be disabled?
The watchdog timer can be disabled via the Enable pin or the SET logic pins. - What is the purpose of the ENOUT pin?
The ENOUT pin serves as the enable output. It can be connected to a pull-up resistor, but the specific circuitry requirements depend on the application. - What is the difference between the SET1 and EN pins?
The SET1 pin is used for setting the watchdog timeout, while the EN pin is used to enable or disable the watchdog timer. The EN pin controls the overall operation of the watchdog. - Can the TPS3431 operate at 1.7V if the minimum supply voltage is 1.8V?
Operating the TPS3431 at 1.7V is not recommended as it is below the specified minimum supply voltage of 1.8V. - What is the junction operating temperature range of the TPS3431?
The junction operating temperature range of the TPS3431 is –40°C to +125°C. - In what package is the TPS3431 available?
The TPS3431 is available in a 3-mm × 3-mm, 8-pin VSON package.
