XC6121F621MR-G

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PMIC (Power Management Integrated Circuit) is a type of device that helps to manage the power in an electronic system. It can regulate, supervise, and control the overall power delivery in any application. In this article, we focus on the application fields and working principle of the XC6121F621MR-G.

Application Field

The XC6121F621MR-G is part of the XC6121F621MR-G family of PMICs and is an ideal power-management supervisor solution, providing a best-in-class combination of features geared towards single-cell Li-Ion/Li-Polymer battery applications. This device is suitable for a wide range of applications due to its flexible monitoring, protection and battery charge control features. Among those applications are consumer mobile phones and mobile communications (GSM/CDMA/WCDMA applications), portable PDAs and navigation systems, consumer appliances, Industrial and medical instruments, and other battery-powered electronics.

In addition, its wide input voltage range for both system and battery make the XC6121F621MR-G suitable for both single-cell and multi-cell systems. The device provides a rich set of features and flexible trip-points, enabling designers to optimize the battery-charge control, preventing battery overcharge and over-discharge. Furthermore, it can be configured to work with a wide range of battery chemistries such as Li-Ion, Li-Polymer, Ni-MH, lead acid, and alkaline.

Working Principle

The XC6121F621MR-G is a supervisory integrated circuit (IC). It contains several comparators that check the power supply voltage against reference voltage levels, generating a status signal according to the result. The status signal can be used to alert the microcontroller, trigger reset signals, or activate peripheral control peripherals. This supervision IC monitors many on-board parameters such as temperature, input voltage, and supply voltage. Depending of the model, the XC6121F621MR-G can detect voltage levels that are both above and below the pre-set thresholds. These thresholds can be set by external components, or the IC can be operated in “automatic” mode, where the thresholds are pre-set and the power supply is monitored automatically.

The XC6121F621MR-G is also able to perform power-on reset (POR) and manual reset (MR) functions. These two functions are essential in any system as they make sure the system will remain in a valid state, guaranteeing the system’s safe operation. The POR function detects when the main system power is initially applied, resetting the system in a valid state; whereas, the MR function detects if the system is in an unexpected state, asserting a reset signal to bring the system back to a valid state. Both of the aforementioned functionalities are controlled with an internal POR timer.

The XC6121F621MR-G also integrates a window watchdog timer (WWDT) which is used for system reset and time-out monitoring. This helps to safely shut down the system if it does not respond in the expected time. Additionally, the over-temperature protection (OTP) monitors the device temperature and issues a reset signal in case of an over temperature condition.

The XC6121F621MR-G has a low-power consumption level, given that it is a modern device built with contemporary process nodes such as CMOS. Furthermore, it has a wide operating temperature range and can be operated at temperatures as low as -40°C and as high as 125°C.

Conclusion

The XC6121F621MR-G is a supervisor IC, which is suitable for a wide array of single-cell Li-Ion/Li-Polymer battery powered applications. It offers safety features like POR, MR, WWDT and OTP reset. The XC6121F621MR-G has a wide operating range (from -40°C to 125°C) and a low power consumption level.

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