Overview
The TPS3813K33DBVR is a processor supervisory circuit with a window-watchdog timer, manufactured by Texas Instruments. This device is designed to provide circuit initialization and timing supervision, primarily for DSPs and processor-based systems. It ensures proper system reset and monitoring of the supply voltage, making it essential for various critical applications.
During power-on, the device asserts the RESET signal when the supply voltage (VDD) rises above 1.1V and keeps it active until VDD exceeds the threshold voltage (VIT). The device includes an internal timer that delays the deassertion of the RESET output to ensure a proper system reset. The TPS3813K33DBVR also features a programmable window-watchdog timer that requires the supervised processor to trigger the WDI pin within a specified window to prevent a reset signal.
Key Specifications
| Parameter | Description |
|---|---|
| Package | 6-Pin SOT-23 |
| Body Size | 2.90mm × 1.60mm |
| Supply Voltage | 2.5V, 3V, 3.3V, 5V |
| Threshold Voltage (VIT) | 2.93V (for TPS3813K33DBVR) |
| Supply Current | 9µA (typical) |
| Reset Delay Time | 25ms (typical) |
| Temperature Range | –40°C to 85°C |
| Watchdog Timer | Programmable with external capacitor or by connecting WDT to GND or VDD |
| Reset Output | Open-drain |
Key Features
- Window-watchdog with programmable delay and window ratio
- Power-on reset generator with a fixed delay time of 25ms
- Precision supply voltage monitor (VIT) for 2.5V, 3V, 3.3V, and 5V
- Open-drain reset output
- Low supply current of 9µA (typical)
- Operating temperature range: –40°C to 85°C
- No external components required for basic operation
Applications
- Active Antenna System mMIMO (AAS)
- Storage area networks
- Electricity meters
- Safety-critical systems
- Infusion pumps
- HVAC controllers
Q & A
- What is the primary function of the TPS3813K33DBVR?
The primary function is to provide circuit initialization and timing supervision for DSPs and processor-based systems.
- What is the threshold voltage (VIT) for the TPS3813K33DBVR?
The threshold voltage (VIT) for the TPS3813K33DBVR is 2.93V.
- How is the watchdog timer programmed?
The watchdog timer can be programmed by connecting the WDT pin to GND, VDD, or using an external capacitor. The window ratio is set by connecting the WDR pin to GND or VDD.
- What is the typical reset delay time?
The typical reset delay time is 25ms.
- What is the operating temperature range of the TPS3813K33DBVR?
The operating temperature range is –40°C to 85°C.
- What type of package does the TPS3813K33DBVR come in?
The device comes in a 6-Pin SOT-23 package.
- What is the supply current of the TPS3813K33DBVR?
The supply current is 9µA (typical).
- Is an external capacitor required for the input supply?
No, an external capacitor is not required, but it is recommended for noisy input supplies.
- What happens if the supply voltage drops below the threshold voltage (VIT)?
If the supply voltage drops below VIT, the RESET output becomes active (low).
- Can the reset output be pulled up to any voltage?
The reset output can be pulled up to any voltage up to 6V, independent of the device supply voltage.
