NXP's MC33772C presents a significant advancement in battery management technology with its six-channel Li-ion battery cell controller capabilities tailored for automotive and industrial applications. This IC, specifically designed for BMS applications, stands out for its reliability, safety features, and optimized bill of materials (BOM).
One key feature of the MC33772C is its ability to manage three to six cells or operate as a battery junction box (BJB) controller. The device offers configurable averaging of cell voltage measurements, a crucial functionality that not only enhances accuracy but also contributes to lowering the BOM, making it a cost-effective solution for battery management systems.
In addition to cell voltage management, the MC33772C includes onboard coulomb counting and an optimized transformer physical layer (TPL) communication interface. This interface supports loop-back topologies with up to 63 nodes, allowing for flexible and scalable system integration in various applications.
Moreover, the MC33772C is designed to meet rigorous safety standards, supporting ISO 26262 with single-chip ASIL C and up to ASIL D functional safety capability. This ensures that the device complies with stringent automotive safety requirements, providing peace of mind for designers and manufacturers.
For evaluation and development purposes, NXP provides evaluation boards (EVB) featuring the MC33772C six-channel battery cell controller. These EVBs cater to automotive and industrial Li-ion battery applications, offering support for cell voltage measurement, passive cell balancing, and GPIOs. Customers can connect these boards to NXP's six-cell battery emulator or their Li-ion battery modules with three to six cells in series.
The evaluation boards, such as the FRDM33772CSPEVB and KIT33772CTPLEVB, facilitate seamless communication between the battery cell controller and the microcontroller unit (MCU). The FRDM33772CSPEVB utilizes an SPI interface for data transfer, while the KIT33772CTPLEVB employs an isolated differential communication bus in conjunction with the FRDMDUAL33664EVB. This setup allows for the connection of up to 63 KIT33772CTPLEVBs in a daisy chain configuration, enabling efficient and scalable system deployment.
In conclusion, NXP's MC33772C stands out as an advanced and versatile solution for battery management systems, offering configurable averaging of cell voltage measurements, robust safety features, and seamless integration capabilities for automotive and industrial applications.
6 V ≤ VPWR ≤ 30 V operation, 40 V transient
Six cell voltage measurement channels with integrated averaging possible up to 256 samples (no averaging for MC33772B)
Total stack voltage measurement
0.8 mV maximum total voltage measurement error
Seven ADC/GPIO/temperature sensor inputs
Integrated current sensor with PGA
±0.5% accuracy from milliamps to kiloamps
Integrated coulomb counter
Onboard 300 mA low RDS(ON) passive cell balancing MOSFETs with diagnostics
Balancing in sleep mode
Programmable balancing timer for each MOSFET
2.0 Mbps, two-wire twisted-pair differential, isolated daisy chain communication
Inductive and capacitive coupling support (only transformer coupling for MC33772B)
Up to sixty-three nodes in one daisy chain (fifteen nodes for MC33772B)
Loopback support for one daisy chain (no loopback capability for MC33772B)
Addressable on initialization
4 Mbps SPI
OV/UV, OT/UT, OC fault verification
Sleep mode OV/UV, OT/UT monitoring
Support ISO 26262, up to ASIL D safety capability
Hot-plug capable and AEC Q-100 compliant
Automotive
14 V Li-ion battery management systems
Battery management systems
High-voltage battery management systems (> 800 V)
Industrial
E-bikes and E-scooters
Energy storage systems (ESS)
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