S-8215AAAH-K8T2U

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Power Management Integrated Circuits (PMIC) batteries have become increasingly important for modern electronic devices due to their high power density and cost efficiency. The S-8215AAAH-K8T2U from Texas Instruments is a multi-chemistry battery management system (BMS) capable of managing 2- to 6-cell Li-ion, Li-polymer, Lead-acid, and Valve-Regulated Lead-Aci (VRLA) battery packs. The BMS can also provide various protection mechanisms such as overcharge/discharge protection, thermal protection, and overcurrent/short-circuit protection.

Application Field

The S-8215AAAH-K8T2U is suitable for a wide range of applications such as electric vehicles, power banks, consumer electronics, IoT devices, and industrial systems. As an integrated BMS, it allows customers to realize the benefits of a multi-chemistry BMS with a single IC solution. The device can monitor each battery cell\'s voltage, temperature and charge/discharge current in real time, allowing for a high degree of accuracy and control. It also provides several safety features such as overcurrent/discharge protection and charge/discharge current limiting.

Working Principle

The S-8215AAAH-K8T2U is a fully integrated 3-phase BMS device that provides up to 12 channels of monitoring, plus an interface such as three LIN/CAN/RS232 communication protocols to communicate with the system\'s main MCU or a secondary microcontroller. Each channel is capable of monitoring the voltage of 2 to 6 cell packs. It also features external temperature input for NTC and Pt-1000 temperature sensors, external current input for both charge and discharge measurements up to 50A, and low-voltage protection for both charge and discharge for each cell. Additionally, the device includes an onboard Flash memory that enables configuration of the device from the host controller.

The BMS also provides a single control output to drive external loads such as a buck/boost regulator or an isolation relay. The output is configurable to provide either a pulse-width modulated (PWM) signal, a high-side switch, or a low-side switch based on the system input. The device supports a wide input voltage range of 6.25 to 40V and the number of cell packs can be easily configured. It also supports up to 17 communication protocols including I2C, SPI, UART and CAN.

The S-8215AAAH-K8T2U employs a dynamic and static cell balancing algorithm that monitors and balances cells within the cell pack to ensure equal cell voltages. This enables the BMS to optimize the performance and safety of the battery pack. The device also features charge and discharge overcurrent protection, low-charge/discharge protection, and over/under-voltage protection, as well as an open/short circuit detection feature.

The S-8215AAAH-K8T2U is also equipped with an interface to allow a host system to conduct a host of maintenance operations such as cell monitoring, charging and discharging, balancing, and temperature monitoring. This allows the host system to periodically check the health and safety of the battery pack and optimize its performance. The host system can also be configured to indicate the status of the battery pack and the charge/discharge profiles, as well as the available capacity and voltage.

Conclusion

The S-8215AAAH-K8T2U BMS provides a single-chip solution for multi-chemistry battery monitoring and management. It provides up to 12 channels of monitoring, plus a rich set of protection features, and an interface for communication with the system\'s main MCU and secondary microcontroller. With its wide range of features and capabilities, the S-8215AAAH-K8T2U is the ideal solution for applications that require multi-chemistry battery monitoring and management.

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