S-80858CNMC-B9JT2G

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Power management IC (PMIC) supervisors play an important part in today’s electronics. Supervisors – such as the S-80858CNMC-B9JT2G – are responsible for monitoring power supply lines, protecting connected circuits in the event of overvoltage or insufficient regulation, and providing reset signals when potential faults are discovered. By understanding the application field and working principle of this particular supervisor, system engineers can employ it to ensure efficient and reliable power management for their systems.

S-80858CNMC-B9JT2G Application Field

The S-80858CNMC-B9JT2G supervisor is an integrated circuit (IC) designed for integration into 3.3V systems. It monitors two input power supply lines for overvoltage and undervoltage events, and it features two active-low indication outputs (the RESET and VDDMON outputs) that changes state quickly when either of these conditions is detected. It also features a RESET signal output that is driven low whenever the input voltage is greater than the VDDXOV signal’s threshold voltage, or whenever the VDD signal is below its minimum threshold voltage or greater than its maximum threshold voltage. This signal can be used to trigger an interrupt or reset peripheral devices on the system.

The S-80858CNMC-B9JT2G has a low operating voltage of 2.0V to 5.5V at room temperature, and has the capability to support multiple power supply lines ranging from 1.3V to 13.2V. Its low current consumption ( typically 1.1µA) means it is well-suited for battery-operated electronic applications such as mobile phones, portable computing devices, and other devices that require a reliable power supply monitoring system. The S-80858NMC-B9JT2G also features an adjustable reset delay time which can be programmed for up to 7.8 seconds after power-up, providing enough time for connected devices to boot.

S-80858CNMC-B9JT2G Working Principle

The supervisor IC works by constantly monitoring the voltage of two input power supply lines, such as a 3.3V input line and a 5V line. When the voltage of either line falls outside of its programmed range or limit, the supervisor quickly reacts by driving its RESET or VDDMON signal low. This signal can be connected to the reset input of peripheral devices, which will then be triggered to reset themselves. The RESET signal can also be used to trigger an interrupt or reset itself, depending on the system.

In addition, the supervisor also detect open-circuit conditions on the monitored input line. An open-circuit condition is when the voltage of an input line is higher than its programmed high limit, or lower than its programmed low limit, for a certain period of time. When this condition is detected, the supervisor will drive its RESET or VDDMON signal low, triggering a peripheral reset or an interrupt.

The S-80858CNMC-B9JT2G supervisor utilizes an advanced on-chip voltage regulator to ensure reliable monitoring of both input lines. In addition, the IC also features diagnostic functions including an external oscillator, self-test logic, and built-in oscillator and monitor circuits. This ensures that the supervisor can identify and manage any potential fault that might be present in the system.

Conclusion

The S-80858CNMC-B9JT2G supervisor is a highly useful IC for system engineers designing 3.3V systems, as it provides reliable overvoltage and undervoltage monitoring, reset and interrupt signals, and advanced diagnostic functions to protect and manage system components. The supervisor provides versatility with its adjustable delay time, low current consumption, and support for multiple power supply lines. By understanding the application field and working principle of this IC, system engineers can ensure efficient and reliable power management for their system.

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