STMicroelectronics AEK-POW-BMSWTX BMS Evaluation Board
STMicroelectronics AEK-POW-BMSWTX BMS Evaluation Board has an embedded transceiver that allows an isolated connection to an external MCU while managing 4 to 14 battery cells. The board implements the L9963E Li-ion battery monitoring and protection chip for high-reliability automotive applications and the L9963T general-purpose SPI to isolated SPI bidirectional transceiver. The L9963E monitors cell and battery node status via stack voltage, cell voltage, temperature measurement, and coulomb counting. A programmable cycle interval performs measurement and diagnostic tasks on demand or periodically. Measurement data is available for an external microcontroller to conduct charge balancing and to compute the state of charge (SOC) and the state of health (SOH).
The L9963T general-purpose SPI to isolated SPI bidirectional transceiver transfers communication data incoming from a classical 4-wire-based SPI interface to a 2-wire isolated interface (and vice versa). The transceiver is configured as a slave.
The STMicro AEK-POW-BMSWTX furnishes an elaborate monitoring network to sense the voltage of each cell. It is possible to sense the current of the entire battery pack. This sensing enables the SOC of each battery cell to be elaborated on and, therefore, the state of charge of all battery packs. The SOC facilitates the assessment of the remaining battery capacity, which equates to the remaining driving range.
Features
- Hosts the L9963E AEC-Q100 qualified automotive multicell battery monitoring and balancing IC
- Hosts the L9963T AEC-Q100 qualified automotive general purpose SPI to isolated SPI bidirectional transceiver
- Voltage monitoring of every single cell and of the entire battery node
- Current sensing of the entire battery node
- 5 GPIOs to connect temperature sensors as NTCs
- CN1 connector that allows establishing communication with an MCU board via SPI
- CN2 connector that interfaces directly to an MCU board for control and diagnostic functions
- Passive balancing
- Compact size of 100mm x 76mm
- Included in the AutoDevKit ecosystem
Applications
- Battery Management Systems (BMS)
- E-mobility
- Home battery accumulators
Components
- ISOH port to connect the board to an AEK-POW-BMS63EN in a daisy chain
- Connector for MCU ADCs dedicated to the NTC sensors reading
- Automotive general-purpose SPI to isolated SPI transceiver
- CN2 connector for diagnostic functions
- CN1 connector to communicate with an MCU board via SPI
- Balancing resistors
- Connector for the battery pack
- Hot-plug protection
- GPIOs for external NTC connection handled by L9963E
- L9963E AEC-Q100 qualified automotive multicell battery monitoring and balancing IC
Associated Products
STMicroelectronics L9963T Automotive SPI to Isolated SPI Transceiver
Designed to create a communication bridge between devices located into different voltage domains.
STMicroelectronics L9963E Multicell Battery Monitoring & Balancing IC
Li-ion battery monitoring and protecting chip for automotive applications & energy storage systems.
Associated Board
STMicroelectronics AEK-POW-BMS63EN Automotive BMS Evaluation Board
Based on the L9963E transceiver, and can handle from 1 to 31 Li-ion battery nodes.
Block diagram
Layout
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STMicroelectronics Standard Products
A broad range of drop-in replacements for general-purpose analog ICs, discretes, and serial EEPROMs.