Overview
The TPS3306-15DR, produced by Texas Instruments, is a part of the TPS3306 family of supervisory circuits. These circuits are designed for circuit initialization in systems that require two supply voltages, particularly in DSP and processor-based systems. The TPS3306-15DR is specifically configured to monitor two independent supply voltages, typically 3.3 V and 1.5 V. It is essential for ensuring proper system reset, power-fail detection, and watchdog timer functionality.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 2.7 V to 6 V | V |
| Supply Current (Typ.) | 15 µA | A |
| Power-On Reset Delay Time | 100 ms | s |
| Watchdog Timer Time-Out | 0.8 s | s |
| Low-Level Output Voltage (RESET, PFO) | 0.2 V to 0.4 V | V |
| Operating Temperature Range | –40°C to +85°C | °C |
| Package Types | MSOP-8, SO-8 | - |
| Threshold Voltages (SENSE1, SENSE2) | 1.37 V, 1.40 V (typ.) | V |
Key Features
- Dual supervisory circuits for monitoring two independent supply voltages.
- Power-on reset generator with integrated 100 ms delay time.
- Watchdog timer with 0.8 second time-out.
- Integrated power-fail comparator with separate open-drain output.
- Open-drain reset and power-fail output.
- Low supply current of 15 µA (typ.).
- Defined RESET output from VDD ≥ 1.1 V.
Applications
- Multivoltage DSPs and processors.
- Portable battery-powered equipment.
- Embedded control systems.
- Voltage monitor for power-fail or low-battery warning.
- Intelligent instruments.
- Automotive systems.
Q & A
- What is the primary function of the TPS3306-15DR?
The primary function of the TPS3306-15DR is to supervise and initialize circuits that require two supply voltages, ensuring proper system reset and power-fail detection.
- What are the typical supply voltages monitored by the TPS3306-15DR?
The TPS3306-15DR typically monitors 3.3 V and 1.5 V supply voltages.
- What is the power-on reset delay time of the TPS3306-15DR?
The power-on reset delay time is 100 ms.
- How does the watchdog timer function in the TPS3306-15DR?
The watchdog timer is triggered by a positive or negative transition of the WDI input and has a time-out interval of 0.8 seconds. If the supervising system fails to retrigger the watchdog within this interval, the RESET output becomes active.
- What is the operating temperature range of the TPS3306-15DR?
The operating temperature range is –40°C to +85°C.
- What package types are available for the TPS3306-15DR?
The TPS3306-15DR is available in MSOP-8 and SO-8 packages.
- How does the power-fail comparator function in the TPS3306-15DR?
The integrated power-fail comparator has a separate open-drain output (PFO) and can be used for low-battery detection, power-fail warning, or monitoring a power supply other than the main supply.
- What is the typical supply current of the TPS3306-15DR?
The typical supply current is 15 µA.
- At what voltage does the RESET output become active during power-on?
The RESET output becomes active when the supply voltage VDD becomes higher than 1.1 V.
- Can the watchdog timer be disabled?
Yes, the watchdog timer can be disabled by leaving the WDI input unconnected.
