ISL9212IRZ

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Power management integrated circuits (PMICs) are a category of Integrated Circuits (ICs) that are designed to help manage the power usage and system health of smart devices. Battery management devices are a special type of PMIC that are designed to manage the current associated with charging and discharging operations associated with any device containing a rechargeable battery. One of these devices is the ISL9212IRZ, a highly featured white-operated low voltage battery monitor IC.

ISL9212IRZ Applications

The ISL9212IRZ is targeted towards lithium-ion and lithium-polymer cell based battery packs for a variety of portable applications. Examples include medical devices, consumer electronic products, unmanned vehicles, and satellites. Additionally, this device is uniquely qualified with several safety features and monitoring operations designed to prevent system level faults due to overcharging and excessive current draw.

The device features an industry standard I2C bus to allow the processor to read protective information and also make modifications to protection parameters. Non-volatile storage of measured information ensures that during power failure or over-voltage events the stored information can still be accessed after the event. An analog input can also be used for measurements such as temperature sensing which can also be utilized for the safety feature implementation.

ISL9212IRZ Working Principle

The ISL9212IRZ is designed to protect lithium batteries from overcharging, over-discharging, over-temperature, and over-current conditions. It does this by monitoring the voltage, current, and temperature of the battery cell, and then comparing this collected data to programmable upper and lower fault limits. When any of these limits is exceeded, the device will alert the user or processor via an I2C alert message, which can then be acted upon.

The device can be programmed with fault limits that correspond to the active battery cell configuration at the time. For example, multiple cells can be connected in series as part of a larger battery stack. In this case, the ISL9212IRZ can be programmed with the correct upper and lower thresholds for each cell in the stack to ensure individual protection of each cell in the stack.

The current measuring functionality of the ISL9212IRZ requires connection to an external sense resistor for monitoring. This sense resistor provides the current feedback loop to the device during charge and discharge events. As mentioned above, this is especially important for monitoring unsafe or unintended current levels or excessive temperature readings during battery charging or discharging.

Lastly, the ISL9212IRZ includes an active Pre-charge™ algorithm to ensure safe and efficient battery cell charging without excessive peak current production. This helps to ensure the charging process occurs in a safe and controlled manner for increased system longevity and improved battery lifetime.

Conclusion

The ISL9212IRZ is a powerful battery monitor IC that can help protect systems from electrical hazards such as overcharging and excessive current draw. It features several safety features and monitoring functions that make it ideal for lithium- ion and lithium-polymer cell based battery packs used in medical devices, consumer electronics, unmanned vehicles, and satellites. Its ability to measure voltage, current, and temperature combined with Pre-charge™ algorithm provides a safe and controlled charging process that helps to ensure increased system longevity and improved battery lifetime.

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