Overview
The TPS3824-50DBVR is a voltage monitor with a watchdog timer from Texas Instruments, part of the TPS382x family. This component is designed to provide circuit initialization and timing supervision, primarily for DSP and processor-based systems. It ensures proper system reset by monitoring the supply voltage and asserting a reset signal when the voltage drops below a predefined threshold. The device is available in a 5-pin SOT-23 package and operates over a temperature range of -40°C to 85°C.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | SOT-23 (5-pin) | 2.90 mm × 1.60 mm |
| Supply Voltage (VDD) | Monitored voltage | 2.5 V, 3 V, 3.3 V, 5 V |
| Threshold Voltage (VIT-) | Negative-going input threshold voltage | 4.46 V to 4.64 V (for 5V option) |
| Watchdog Time Out | Time out period for watchdog timer | 1.6 seconds |
| Delay Time (td) | Reset delay time after VDD rises above threshold | 120 ms to 300 ms |
| Manual Reset (MR) | Input to force a reset | Pull low to force reset |
| Reset Output | Type of reset output | Active-low or active-high, push-pull or open-drain |
| Operating Temperature | Temperature range for operation | -40°C to 85°C |
Key Features
- Supply Voltage Monitoring: Monitors the supply voltage and asserts a reset signal when the voltage drops below the predefined threshold voltage (VIT-).
- Watchdog Timer: Offers watchdog time out options of 1.6 seconds to ensure system integrity.
- Manual Reset: Allows an external logic signal to force a reset regardless of the supply voltage or watchdog timer state.
- Active-High or Active-Low Output: Provides both active-high and active-low reset output options, either push-pull or open-drain.
- No External Components Required: The device uses an internal voltage divider to set the threshold voltage, eliminating the need for external components.
Applications
- DSP and Processor-Based Systems: Primarily designed for digital signal processors and microprocessor-based systems.
- Notebook and Desktop Computers: Suitable for use in notebook and desktop computers to ensure proper system reset and watchdog functionality.
- Industrial Equipment and Programmable Controls: Used in various industrial applications and programmable control systems to monitor and manage power supply voltages.
Q & A
- What is the primary function of the TPS3824-50DBVR?
The primary function is to monitor the supply voltage and provide a reset signal when the voltage drops below a predefined threshold, ensuring proper system initialization and timing supervision.
- What are the available supply voltage options for the TPS3824-50DBVR?
The device can monitor supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V.
- What is the watchdog time out period for the TPS3824-50DBVR?
The watchdog time out period is 1.6 seconds.
- How does the manual reset feature work on the TPS3824-50DBVR?
The manual reset feature allows an external logic signal to force a reset by pulling the MR input low, regardless of the supply voltage or watchdog timer state.
- What types of reset outputs are available on the TPS3824-50DBVR?
The device provides both active-high and active-low reset output options, which can be either push-pull or open-drain.
- Do I need external components to set the threshold voltage for the TPS3824-50DBVR?
No, the device uses an internal voltage divider to set the threshold voltage, so no external components are required.
- What is the operating temperature range for the TPS3824-50DBVR?
The operating temperature range is -40°C to 85°C.
- In what package is the TPS3824-50DBVR available?
The device is available in a 5-pin SOT-23 package.
- What are some common applications for the TPS3824-50DBVR?
Common applications include DSP and processor-based systems, notebook and desktop computers, and industrial equipment.
- How does the reset delay time work on the TPS3824-50DBVR?
The reset delay time (td) starts after the supply voltage (VDD) rises above the threshold voltage (VIT- + VHYS), ensuring proper system reset.
