TLV809J25DBZR

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PMIC, an abbreviation for Power Management Integrated Circuits, are dedicated devices for managing the power supply of different electrical systems.The TLV809J25DBZR is one such device from Texas Instruments, belonging to the range of PMIC Supervisors.

The TLV809J25DBZR is a low-voltage reset supervisor with integrated process, temperature and voltage detectors, which allows applications with low-voltage supplies to be better controlled. It is an integrated, precision voltage monitoring and reset solution that ensures safe operation and data integrity. This device boasts an operating temperature range from -40°C to 125°C, a preset voltage detector threshold voltage range from 1.1V to 3.36V, and a package option of TSSOP-14.

The device features two reset comparators, which are proved to reset the system and reset configuration pins, as well as two reset outputs and a manual reset input. The adjustable voltage threshold comparators together with a watchdog timer detect supply voltage and temperature changes, helping maintain system stability. The manual reset input is also a user-defined reset source, making the device is suitable for situations where outdoor temperature measurements are needed.

As for the device’s working principle, it boasts high accuracy and fast response time. This device is designed to monitor and protect power systems from critical failures. By observing the output of its voltage detector, the reset comparator ensures that the supply voltage does not exceed the VDD low-voltage limit of the application, or a higher user-defined threshold, to guarantee system stability and safety. This also helps prevent data corruption due to power glitches.

The voltage detector is a precision voltage detector, which is fast to ensure quick response and low current consumption, saving power. It consists of an input resistance of 10kΩ, a precision voltage reference, and an open-drain output. This Precision Voltage Detector allows the user to adjust the upper and lower threshold voltages for reset initiation over the supported range of 1.1V to 3.36V. The low-voltage limit can also be adjusted to provide an extra level of protection for the system.

The watchdog timer of the device is implemented using an RC oscillator, with a wide range (100ms to5s) of adjustable reset times. This timer is essential in cases where the system is running on alow-voltage supply and must be monitored for system operation, malfunctioning, or other malfunctions. The WD input of the device is used to trigger a reset pulse in case offailure.

The manual reset input of the device, which can also be used to reset the system, is a low activesignal button. Pressing it will cause the reset comparator to check the output of the voltage detector and initiate a reset pulse if the corresponding threshold is violated. This feature makes the device suitable for outdoor use, where temperature measurements are needed.

The above are the main application areas and working principles of the Texas Instruments TLV809J25DBZR, which is a PMIC supervisory device with integrated voltage, process, and temperature detectors. The device provides safe operation and data integrity, and can reside in systems running on both low-voltage and high-voltage supplies, making it a versatile and reliable power management solution.

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