Overview
The TPS3431-Q1 is a standard automotive programmable watchdog timer designed by Texas Instruments. This device is specifically tailored for automotive applications, offering high precision and reliability. It features an enable/disable function, making it versatile for various system designs. The TPS3431-Q1 is AEC-Q100 qualified, ensuring it meets stringent automotive standards, and it operates over a wide temperature range of –40°C to +125°C. The device includes a precision watchdog timer with ±2.5% accuracy at 25°C and up to 15% accuracy over the specified temperature range.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 1.8 | 6.5 | V | |
| Supply Current (IDD) | 10 | 19 | µA | |
| Power-on Reset Voltage (VPOR) | 0.8 | V | ||
| EN Pin Internal Pullup Current (IEN) | 500 | 620 | 700 | nA |
| CWD Pin Charge Current (ICWD) | 347 | 375 | 403 | nA |
| CWD Pin Threshold Voltage (VCWD) | 1.196 | 1.21 | 1.224 | V |
| Output Low Voltage (VOL) | 0.4 | V | ||
| Output Leakage Current (ID) | 1 | µA | ||
| Low-Level Input Voltage (VIL) | 0.25 | V | ||
| High-Level Input Voltage (VIH) | 0.8 | V | ||
| Junction-to-Ambient Thermal Resistance (RθJA) | 47.7 | °C/W |
Key Features
- AEC-Q100 qualified for automotive applications with a device temperature grade 1: –40°C to +125°C ambient operating temperature.
- Functional safety-capable with documentation available to aid functional safety system design.
- Factory-programmed precision watchdog timers with ±2.5% accuracy typical at 25°C and up to 15% accuracy over the specified temperature range.
- User-programmable watchdog timeout using an external capacitor or factory-programmed default delay settings.
- Watchdog disable feature via the Enable pin or the SET logic pins.
- Input voltage range: VDD = 1.8 V to 6.5 V.
- Low quiescent current: IDD = 10 µA (typical).
- Active-low open-drain output.
- Enable input (EN) and enable output (ENOUT).
- Available in a small 3-mm × 3-mm, 8-pin VSON package.
- Wettable flanks for easy optical inspection.
Applications
- Automotive center information display.
- Automotive display module.
- Digital cockpit processing unit.
- Power distribution box.
- Seat comfort module.
- Automotive external amplifier.
- Motorcycle instrument cluster.
- Body control module.
Q & A
- What is the operating temperature range of the TPS3431-Q1?
The TPS3431-Q1 operates over a temperature range of –40°C to +125°C.
- What is the accuracy of the watchdog timeout at 25°C?
The watchdog timeout accuracy is ±2.5% typical at 25°C.
- How can the watchdog timer be disabled?
The watchdog timer can be disabled via the Enable pin (EN) or the SET logic pins.
- What is the input voltage range for the TPS3431-Q1?
The input voltage range is from 1.8 V to 6.5 V.
- What is the typical quiescent current of the TPS3431-Q1?
The typical quiescent current is 10 µA.
- What type of package is the TPS3431-Q1 available in?
The TPS3431-Q1 is available in a 3-mm × 3-mm, 8-pin VSON package.
- Is the TPS3431-Q1 AEC-Q100 qualified?
Yes, the TPS3431-Q1 is AEC-Q100 qualified for automotive applications.
- How is the watchdog timeout programmed?
The watchdog timeout can be programmed using an external capacitor or factory-programmed default delay settings.
- What are the key applications of the TPS3431-Q1?
Key applications include automotive center information display, digital cockpit processing unit, power distribution box, and more.
- Does the TPS3431-Q1 support functional safety?
Yes, the TPS3431-Q1 is functional safety-capable with available documentation to aid in functional safety system design.
