MAX8213BCSE

Power management ICs (PMICs) are electrical components commonly used in the development of battery-operated systems or those that need to manage multiple energy sources, such as those in the automotive or industrial markets. Within the family of this type of components, there are supervisors. The MAX8213BCSE chip is one of these supervisors and offers a wide range of features in a tiny package. In this article, we\'ll look at what is the main application field of the MAX8213BCSE and how it works.

Applications

The MAX8213BCSE is a power management supervisor designed to provide a simple, robust and accurate system power-on reset (POR). The chip focuses primarily on battery-powered devices and other low-power electronic systems. It\'s specially designed for mobile and portable system applications and any other device powered by a single Li-ion or Li-Polymer battery.

The MAX8213BCSE supervisor is designed to monitor a single 3.2V to 6V input and provides the system with a powering reset, between 1V and 6V. The chip also provides reset in case of a low-voltage and/or high-temperature condition, thus preventing improper system behavior. Moreover, the MAX8213BCSE is also capable of monitoring a +3.3V input rail.

The MAX8213BCSE is very versatile and its features allow it to be used in a wide range of industrial, automotive, commercial and consumer applications. A few examples are embedded systems, industrial automation processes, instruments, portable audio equipment, hand-held GPS navigation devices and more.

How does it work?

The MAX8213BCSE power supervisor can operate in several modes depending on how its pins are configured, these being manual reset (MR), open-drain manual reset (ODMR), reset/open-drain reset (ROR) and high active reset (HAR). To choose the correct mode, it needs to think about the circuit requirements. The general operation of the chip is tri-state.

In Manual Reset (MR) mode, the MAX8213BCSE can monitor an active-high manual reset input (MR) and a PWR input rail. In this mode, the MAX8213BCSE asserts automatically active-low reset (RESET) when the voltage at PWR drops below the specified threshold. When the voltage at the manual reset input (MR) is pulled high (to the power supply rail), the MAX8213BCSE de-asserts the reset signal.

In Open-Drain Manual Reset (ODMR) mode, the MAX8213BCSE can be used with an active-low external reset. It is configured to assert an open-drain signal when its input PWR drops below the specified threshold. In order to de-assert the open-drain configuration, an external active-low signal must be applied to the manual reset input.

In Reset/Open-Drain Reset (ROR) mode, the MAX8213BCSE has two outputs. The reset output is an active-low signal, whereas the open-drain output has an open-drain configuration. Both outputs are de-asserted when the voltage at its input PWR rises above the specified threshold.

Finally, in High Active Reset (HAR) mode, the MAX8213BCSE asserts an active-high reset signal when its input PWR drops below threshold. When the voltage at its input PWR rises above the POR threshold, the reset signal is de-asserted.

Conclusion

The MAX8213BCSE is a supervisor IC designed to provide a simple, robust and accurate system power-on reset. Its many features and configurability make it suitable for a wide range of applications and its tiny package makes it very convenient for integrating it in mobile and other low-power applications.