MN13822GP Integrated Circuits (ICs)

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The most common appliance used to protect applications from power supply errors is PMIC – Supervisors. As a supervisor with a large number of features, the MN13822GP combines features such as monolithic voltage regulators and logic control functions.The MN13822GP is characterized by a slightly longer typical start-up time of 10msec, high accuracy and low current consumption of 1µA. It additionally includes an internal voltage regulator and integrated delay circuit so the pulled up voltage after the supervisor’s initial power up can be set up to 5.5V.

The application field of the MN13822GP is wide, as it can be applied for suppressing power rail glitches, system reset in fail-safe mode and for watchdog timer generation and control. Additionally, it can be used for providing supervisory reset and timer functions as a system supervisor in computer, communication, consumer electronic and automotive systems.

The operating principle of the MN13822GP lies in the management of two different voltage sources, one on each side of the chip. The logic threshold at the first side of the chip is used to decide if the chip should take action and the VCC supervisor block is used to monitor the VCC voltage. When the reset is active the VCC monitor’s output is pulled down to 0 and all the digital output pins of the MN13822GP discharge.

On the detecting side of the MN13822GP chip, it sets a threshold voltage of 1.8V with a +/-1% accuracy. Within an operating temperature range from -40C to +85C (error +/- 0.11C) a current of 1µA is drawn from the monitoring voltage source when the voltage is below the predetermined threshold. The 1µA current then turns on the internal power LED after approximately 5–6msec.

The MN13822GP also comes with an internal driver that is capable of working under a wide range of input and output voltages. It has three selectable logic thresholds: 2V, 3V or 3.3V. It also has two timer functions, namely the reload and one-shot timer. The reload timer can be used to generate a reset pulse of 1.8 msec if required, while the one-shot timer can be set up for longer reset times of 10-100 msec, depending on the supply voltage. Additionally, the MN13822GP can be configured as a watchdog timer mode.

In summary, the MN13822GP is a single package power manager IC with a wide range of features, making it perfect for numerous applications. It offers low operational current, high accuracy and a wide operating temperature range. Its multiple logic and voltage thresholds make it a great choice for reset control and watchdog timer generation. Lastly, its wide selection of functions may support and improve various microcontroller systems in existence today.

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