Key Features & Responsibilities
- Full Hardware Design Lifecycle: Led the complete hardware design process from conceptualization, requirements gathering, and component selection through to detailed schematic capture and documentation using Altium Designer.
- Core BMS Functionality: Engineered the cell monitoring and balancing subsystem around the NXP MC33771CTPIAE 14-channel Battery Cell Controller, enabling precise voltage and temperature sensing (via NTCs) for each cell, along with passive cell balancing.
- Microcontroller & Processing: Integrated the NXP S32K344 automotive-grade microcontroller as the central processing unit, managing BMS logic, communication protocols, and telemetry data.
- Advanced Telemetry & Connectivity: Designed and implemented a multi-faceted telemetry subsystem featuring:
- 5G Connectivity: Integrated an A55xQ5G module for high-speed, wide-area network communication.
- Wi-Fi & Bluetooth: Incorporated an AW690 Wi-Fi module (Mini PCIe) and an HC-08 Bluetooth module for local wireless communication and configuration.
- Data Storage: Included eMMC and QSPI Flash for firmware, configuration, and data logging.
- Power Supply Design: Architected a robust multi-rail power supply system using various buck converters (e.g., TPS54560, TPS62130A) and an NXP FS26 System Basis Chip (SBC) to efficiently power all onboard components from the battery input.
- Communication Interfaces: Implemented multiple communication interfaces:
- CAN FD: Utilized TJA1448 transceivers for high-speed automotive communication.
- LIN: Integrated TJA1124 transceivers for local interconnect network.
- UART & USB: Provided interfaces for debugging, direct communication, and data transfer.
- Control & Protection: Designed High-Side and Low-Side driver circuits for controlling external contactors, pre-charge circuits, and other switching elements critical for battery pack safety and operation.
- Signal Integrity & PCB Considerations: Ensured robust signal integrity for high-speed interfaces (like PCIe for Wi-Fi, QSPI) and implemented best practices for EMI/EMC mitigation during the design phase. (If you did PCB layout, expand on this here).
Technologies & Tools Used
- Primary Microcontroller: NXP S32K344
- Battery Cell Controller: NXP MC33771CTPIAE
- Telemetry Modules: A55xQ5G (5G), AW690 (Wi-Fi), HC-08 (Bluetooth)
- Power ICs: NXP FS26 (SBC), Texas Instruments TPS54560, TPS62130A (Buck Converters)
- Communication Transceivers: TJA1448 (CAN FD), TJA1124 (LIN)
- Memory: QSPI Flash, eMMC
- Design Software: Altium Designer
- Key Protocols: CAN FD, LIN, UART, SPI, I2C, USB, PCIe
- Battery Configuration: 48V nominal, 14-cell Lithium-ion