Overview
The TPS3813J25DBVR is a supervisory circuit from Texas Instruments, designed to provide circuit initialization and timing supervision primarily for DSPs and processor-based systems. This device is part of the TPS3813xxx family and is packaged in a 6-pin SOT-23 (DBV) package. It features a power-on reset generator with a fixed delay time of 25ms and a precision supply voltage monitor with threshold voltages of 2.5V, 3V, 3.3V, and 5V. The device also includes a window-watchdog with programmable delay and window ratio, making it suitable for safety-critical applications. The TPS3813J25DBVR operates over a temperature range of –40°C to 85°C and has a typical supply current of 9µA.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Package | SOT-23 (DBV) | 6-pin package |
| Operating Temperature Range | –40°C to 85°C | Temperature range for operation |
| Supply Voltage (VDD) | 2.5V, 3V, 3.3V, 5V | Precision supply voltage monitor thresholds |
| Power-On Reset Delay | 25ms (typical) | Fixed delay time after VDD rises above VIT |
| Supply Current | 9µA (typical) | Typical supply current |
| Watchdog Timer | Programmable delay and window ratio | Upper and lower limits set by WDT and WDR pins |
| Reset Output | Open-drain | Reset output type |
Key Features
- Window-Watchdog: Programmable delay and window ratio to ensure the supervised processor triggers the watchdog within a specified window to prevent reset assertion.
- Power-On Reset Generator: Fixed delay time of 25ms to ensure proper system reset after power-on.
- 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 output to be pulled up to any voltage up to 6V.
- Compact Package: 6-pin SOT-23 (DBV) 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: Suitable for use in smart metering applications.
- Safety Critical Systems: Ideal for systems requiring high reliability and fault tolerance.
- Infusion Pump: Used in medical devices to ensure precise and reliable operation.
- HVAC Controller: Applied in heating, ventilation, and air conditioning control systems.
Q & A
- What is the primary function of the TPS3813J25DBVR?
The primary function is to provide circuit initialization and timing supervision, particularly for DSPs and processor-based systems.
- What is the package type and pin count of the TPS3813J25DBVR?
The device is packaged in a 6-pin SOT-23 (DBV) package.
- What are the supported supply voltage thresholds for the TPS3813J25DBVR?
The device supports supply voltage thresholds of 2.5V, 3V, 3.3V, and 5V.
- How does the power-on reset generator work?
The power-on reset generator asserts RESET when VDD rises above 1.1V and keeps it active until VDD exceeds the threshold voltage (VIT), followed by a fixed delay of 25ms.
- What is the purpose of the window-watchdog timer?
The window-watchdog timer ensures the supervised processor triggers the watchdog within a specified window to prevent reset assertion.
- How is the reset output configured?
The reset output is open-drain and can be pulled up to any voltage up to 6V.
- What is the typical supply current of the TPS3813J25DBVR?
The typical supply current is 9µA.
- What is the operating temperature range of the TPS3813J25DBVR?
The device operates over a temperature range of –40°C to 85°C.
- Can the TPS3813J25DBVR be used in safety-critical applications?
Yes, it is designed for use in safety-critical applications due to its robust features and reliability.
- How are the upper and lower limits of the watchdog time-out set?
The upper limit is set by connecting WDT to GND, VDD, or using an external capacitor, while the lower limit is set by connecting WDR to GND or VDD.
