Overview
The TPS3813I50DBVT, part of the TPS3813xxx family, is a processor supervisory circuit designed by Texas Instruments. This device provides essential functions for circuit initialization and timing supervision, particularly in systems based on DSPs and microprocessors. During power-on, the TPS3813I50DBVT asserts the RESET signal when the supply voltage (VDD) exceeds 1.1V and keeps it low until VDD rises above the threshold voltage (VIT). The device features a fixed delay time of 25ms to ensure proper system reset. Additionally, it includes a window-watchdog timer with programmable delay and window ratio, enhancing system reliability and safety.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | 6-Pin SOT-23 | SOT-23 (6) |
| Body Size | Nominal dimensions including pins | 2.90mm × 1.60mm |
| Supply Voltage Range | Recommended operating range | 2V to 6V |
| Threshold Voltage (VIT) | For TPS3813I50DBVT | 4.55V |
| Power-On Reset Voltage (VPOR) | VDD voltage for power-on reset | ≥ 1.1V |
| Reset Delay Time (td) | Typical delay time after VDD rises above VIT | 25ms |
| Supply Current | Typical supply current | 9µA |
| Temperature Range | Operating temperature range | –40°C to 85°C |
| Watchdog Timer Inputs | Programmable watchdog delay and window ratio inputs | WDI, WDT, WDR |
| Reset Output | Type of reset output | Open-drain |
Key Features
- Window-Watchdog Timer: Programmable delay and window ratio to ensure the supervised processor triggers within a specified window to prevent RESET assertion.
- Power-On Reset Generator: Fixed delay time of 25ms to ensure proper system reset.
- Precision Supply Voltage Monitor: Supports threshold voltages of 2.5V, 3V, 3.3V, and 5V.
- Low Supply Current: Typical supply current of 9µA.
- Open-Drain Reset Output: Allows the RESET pin to be pulled up to any voltage up to 6V.
- Compact Package: Available in a 6-pin SOT-23 package.
- Wide Temperature Range: Operates over a temperature range of –40°C to 85°C.
Applications
- Active Antenna System mMIMO (AAS): Used in advanced antenna systems for wireless communication.
- Storage Area Network: Ensures reliable operation in storage networks.
- Electricity Meters: Provides supervisory functions in smart metering applications.
- Safety Critical Systems: Suitable for systems requiring high reliability and safety, such as infusion pumps and HVAC controllers.
Q & A
- What is the primary function of the TPS3813I50DBVT?
The primary function is to provide circuit initialization and timing supervision, especially for DSPs and processor-based systems.
- What is the threshold voltage (VIT) for the TPS3813I50DBVT?
The threshold voltage (VIT) for the TPS3813I50DBVT is 4.55V.
- How is the reset delay time specified for this device?
The reset delay time is typically 25ms after VDD rises above the threshold voltage (VIT).
- What is the purpose of the window-watchdog timer in the TPS3813I50DBVT?
The window-watchdog timer ensures that the supervised processor triggers within a specified window to prevent RESET assertion.
- What is the typical supply current of the TPS3813I50DBVT?
The typical supply current is 9µA.
- What type of package is the TPS3813I50DBVT available in?
The device is available in a 6-pin SOT-23 package.
- What is the operating temperature range for the TPS3813I50DBVT?
The operating temperature range is –40°C to 85°C.
- How is the reset output configured?
The reset output is an open-drain type, allowing it to be pulled up to any voltage up to 6V.
- What are some common applications for the TPS3813I50DBVT?
Common applications include active antenna systems, storage area networks, electricity meters, and safety-critical systems.
- How is the watchdog timer programmed?
The watchdog timer is programmed by connecting the WDT and WDR pins to GND, VDD, or using an external capacitor.
