TPS3307-25DGNR

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The TPS3307-25DGNR is a low-voltage supervisor developed by Texas Instruments (TI) that provides fault information and reset signal generation. The device is a part of TI\'s Supervisory family, which is a type of Power Management Integrated Circuit (PMIC) that provides voltage regulation, power sequencing, and power supply monitoring functions. The TPS3307-25DGNR is designed to detect power fault events and generate an active-low reset signal to protect applications from system power fault conditions. This device can be used for a variety of general-purpose system fault monitoring applications such as battery charging, system power supply, system reset, and fault detection.

Overview

The TPS3307-25DGNR\'s features include an adjustable reset delay, a digital reset output, a 4.418V/3.3V detection voltage, and a power-on reset. The reset delay allows the user to extend the duration of the reset signal to prevent reset glitches during quick power changes. The reset output is an active-low output, which allows the supervisor to drive a reset signal to other digital circuits and prevent false reset events. The detection voltage is adjustable by using resistor dividers, which allows the supervisor to detect power faults in real time. Finally, the power-on reset ensures the device is initialized properly and circuit operations begin immediately.

Application Field

The TPS3307-25DGNR is suitable for a range of applications that require fault detection and reset signal generation. These applications include battery charging, microprocessor systems, and system reset circuits.

The TPS3307-25DGNR is especially useful for battery charging as it can detect when the battery voltage reaches a power fault level and generate a reset signal to protect the circuit. The device can also detect when the battery is completely discharged or dangerously overcharged, which is an important feature in applications requiring reliable battery charging.

The device is also suitable for a variety of microprocessor systems, such as personal computers and smartphones, as it can detect power supply failures and generate a reset signal to ensure a clean restart of the system. The reset output of the device is also active-low, so it can drive a reset signal directly to digital circuits without the need for an additional reset circuit.

The TPS3307-25DGNR can also be used in system reset circuits, allowing the device to detect power faults and generate a reset signal to reset the entire system in the event of a power fault. This is especially useful for applications that implement a wide variety of power sources, as the device can detect power faults in any of the power sources and reset the entire system.

Working Principle

The working principle of the TPS3307-25DGNR is relatively simple. The device is designed to detect power-fault events, such as an overvoltage or undervoltage condition, and generate a reset signal. The device utilizes two voltages, VDD and VDDMON, to detect the power-fault events. VDD is the main operating voltage of the device and VDDMON is the voltage used to monitor the power supply.

When the monitored voltage drops below or rises above the specified thresholds (determined by the resistor dividers), the device will Assert the RESET Pin and pull it low. If a power fault persists, the device will continue to Assert the RESET Pin until the fault condition is cleared, at which point the RESET Pin will be released and returned to its inactive state. Additionally, the reset delay can be adjusted to extend the duration of the reset signal and prevent reset glitches during quick power changes.

Conclusion

The TPS3307-25DGNR from TI is a low-voltage supervisor designed to detect power fault events and generate a reset signal to protect applications from system power fault conditions. The device is suitable for a variety of applications, such as battery charging, microprocessor systems, and system reset circuits. The working principle of the TPS3307-25DGNR is relatively simple and utilizes a monitored voltage and adjustable reset delay to detect power faults and generate a reset signal.

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