Overview
The TPS3813K33DBVTG4 is a part of the TPS3813xxx family of supervisory circuits produced by Texas Instruments. These circuits are designed to provide circuit initialization and timing supervision, primarily for DSPs and processor-based systems. During power-on, the RESET signal is asserted when the supply voltage (VDD) rises above 1.1V and remains low until VDD exceeds the threshold voltage (VIT). The device features an internal timer that delays the deassertion of the output to ensure a proper system reset, with a typical delay time of 25ms. Additionally, the TPS3813xxx family 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 | Operating voltage range | 2V to 6V |
| Threshold Voltage (VIT) | Fixed threshold voltage for TPS3813K33DBVTG4 | 2.93V |
| Power-On Reset Delay | 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 Input | Programmable watchdog delay input | WDT pin |
| Watchdog Ratio Input | Programmable window ratio input | WDR pin |
| Reset Output | Open-drain reset output | RESET pin |
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 after VDD rises above the threshold voltage (VIT).
- 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 for flexibility in connecting the reset signal to various voltage levels.
- 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 supervision 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 TPS3813K33DBVTG4?
The primary function is to provide circuit initialization and timing supervision for DSPs and processor-based systems.
- What is the typical power-on reset delay time?
The typical power-on reset delay time is 25ms.
- What is the threshold voltage (VIT) for the TPS3813K33DBVTG4?
The threshold voltage (VIT) is 2.93V.
- How is the watchdog timer configured?
The watchdog timer is configured using the WDT and WDR pins, allowing for programmable delay and window ratio.
- What is the operating temperature range of the TPS3813K33DBVTG4?
The operating temperature range is –40°C to 85°C.
- What is the typical supply current of the TPS3813K33DBVTG4?
The typical supply current is 9µA.
- What type of package is the TPS3813K33DBVTG4 available in?
The device is available in a 6-pin SOT-23 package.
- What are some common applications of the TPS3813K33DBVTG4?
Common applications include active antenna systems, storage area networks, electricity meters, and safety-critical systems.
- How does the device handle power-on reset?
The device asserts the RESET signal when VDD rises above 1.1V and keeps it low until VDD exceeds the threshold voltage (VIT), followed by a 25ms delay before deasserting the RESET signal.
- What precautions should be taken for the input supply voltage?
The input supply voltage should not exceed 7V, and if the supply is noisy, a 0.1µF capacitor between VDD and GND is recommended.
