Overview
The TPS3823-30DBVRG4, part of the TPS382x family from Texas Instruments, is a voltage monitor with a watchdog timer designed to provide circuit initialization and timing supervision. This device is particularly suited for DSP and processor-based systems, ensuring proper system reset and monitoring supply voltages.
The TPS3823-30DBVRG4 features a power-on reset generator, manual reset input, and a watchdog timer. It operates over a supply voltage range of 2.5 V to 5 V and is available in a 5-pin SOT-23 package. The device is characterized for operation over a temperature range of −40°C to 85°C, with the TPS3823A-33 variant extending this range to 125°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VDD (Supply Voltage) | 2.5 | - | 5 | V |
| Threshold Voltage (VIT-) | 2.63 | - | - | V |
| Delay Time (td) | 120 | 200 | 300 | ms |
| Watchdog Time Out (ttout) | 0.9 | 1.6 | 2.5 | s |
| Supply Current | - | 15 | - | μA |
| Operating Temperature | -40 | - | 85 | °C |
| Package | - | - | - | 5-pin SOT-23 |
Key Features
- Power-on Reset Generator: With a fixed delay time of 200 ms.
- Manual Reset Input: Allows an external logic signal to force a reset.
- Watchdog Timer: Periodically triggered by transitions at the WDI pin to avoid a reset signal.
- Supply Voltage Supervision: Monitors supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V.
- Reset Output Options: Available in active-low, active-high, and open-drain configurations.
- Low Supply Current: Typical supply current of 15 μA.
- Compact Package: 5-pin SOT-23 package.
Applications
- DSPs, Microcontrollers, and Microprocessors: For circuit initialization and timing supervision.
- Industrial Equipment: For reliable operation in industrial environments.
- Programmable Controls: In various control systems.
- Automotive Systems: For robust and reliable operation in automotive applications.
- Portable and Battery-Powered Equipment: To ensure proper system reset and power management.
- Intelligent Instruments and Wireless Communications Systems: For monitoring and supervising supply voltages.
- Notebook and Desktop Computers: To provide power-on reset and watchdog functionality.
Q & A
- What is the primary function of the TPS3823-30DBVRG4?
The primary function is to provide circuit initialization and timing supervision, including power-on reset and watchdog timer capabilities.
- What are the available reset output configurations for the TPS3823-30DBVRG4?
The reset output is available in active-low, active-high, and open-drain configurations.
- What is the typical supply current of the TPS3823-30DBVRG4?
The typical supply current is 15 μA.
- What is the operating temperature range for the TPS3823-30DBVRG4?
The operating temperature range is −40°C to 85°C, with the TPS3823A-33 variant extending to 125°C.
- What is the purpose of the watchdog timer in the TPS3823-30DBVRG4?
The watchdog timer must be periodically triggered by transitions at the WDI pin to avoid a reset signal being issued.
- How does the manual reset input work on the TPS3823-30DBVRG4?
The manual reset input allows an external logic signal to force a reset regardless of the supply voltage or watchdog timer state.
- What package type is the TPS3823-30DBVRG4 available in?
The device is available in a 5-pin SOT-23 package.
- What are some common applications for the TPS3823-30DBVRG4?
Common applications include DSPs, microcontrollers, industrial equipment, automotive systems, and portable electronics.
- How does the power-on reset generator work?
The power-on reset generator asserts when the supply voltage rises above 1.1 V and includes a fixed delay time to ensure proper system reset.
- Can the watchdog timer be disabled?
Yes, the watchdog timer can be disabled by disconnecting the WDI pin from the system or by placing a 1-kΩ resistor from WDI to ground.
