ADM812RARTZ-REEL

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The ADM812RARTZ-REEL is a PMIC (Power Management Integrates Circuits) that belongs to the Supervisors category. A Supervisor is an integrated circuit designed to monitor the power supply and reset the microcontroller upon malfunction. Resetting the microcontroller protects the system from potential damage during power fluctuations, preventing data loss and maximizing system stability. The ADM812RARTZ-REEL is an integrated circuit with multiple functions including power-on reset (POR), Under-Voltage Lockout (UVLO), over temperature protection, and signal conditioning. This PMIC can be used in many applications and is designed to optimize overall system performance. Here are the features involved in its application and operation.

Application Fields

The ADM812RARTZ-REEL is primarily used in 3G/4G modems, DSRC modules, radios, and automotive infotainment systems. It is built for low-power systems and its wide voltage range makes it suitable for automotive, DECT, and avionics systems as well. Other than being used in automobiles, it can also be employed in home and industrial applications too.

Features

The ADM812RARTZ-REEL has several features that make it suitable in applications where low power and stability is important. It has a working voltage between 3.0V to 18V, suitable in a range of automotive applications. Power up sequences are achieved by following the ranges of 0V to 0.2V and 0.2V to 5V. It also has a power on reset (POR) signal of 0.6V, which ensures quick and reliable startup of the controlled application. An external voltage applied during power up is filtered and conditioned to prevent false triggering of the POR.

Protection Functionalities

The ADM812RARTZ-REEL has a built-in over temperature protection (OTP). This feature serves to protect the system from the risk of failure due to sudden power fluctuations or overheating in case the temperature of the board exceeds the set temperature limit. An inbuilt under-voltage lockout (UVLO) prevents the powered device from working if the applied voltage is lower than the specified limit; this prevents potential damage of components in the system. A power on reset (POR), which is implemented through a comparator, is employed in case of large transients.

Working Principle

The built-in comparator circuit monitors the input voltage (VIN) and regulates the system accordingly. When the VIN is above a certain threshold (usually around 2.9V for most systems), the comparator sends an active high reset signal to the system. When the VIN drops below this threshold, the POR is sent and the microcontroller is reset. This prevents the system from entering an unexpected state, protecting it from potential damage.

When an over temperature situation is detected, the ADM812RARTZ-REEL triggers the OTP and sends a reset signal to the system. This prevents the board and other components from becoming damage due to overheating. The external voltage is filtered and conditioned to ensure proper operation of the system as well. Finally, when the input voltage reaches the set UVLO limit, the chip sends a reset signal to the microcontroller to prevent further damage.

Conclusion

The ADM812RARTZ-REEL is a PMIC supervisor that caters to the needs of low-power applications. It is primarily used in 3G/4G modems, DECT, radios, and automotive systems. It has a wide voltage range, allowing it to be used in various types of applications. Features such as power-on reset, over temperature protection, and under-voltage lockout add robustness to its operation. Its various protection functionalities and comparator-based reset circuit make it perfectly suited for automotive and industrial applications.

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