NuAxi

M03 · BMS ARCHITECTURE

BMS architecture

A checkable signal chain from cells to monitor AFE, isolation, control and CAN. Each box links to a part page; dashed lines are isolated bias/safety paths, not a board layout.

2 BMS AFE routes4 isolation/power/MCU/CAN stagesASIL-D documented up to on key AFEs
CELL / SENSEISOLATIONCONTROLVEHICLECell stack6–16S / 400–800VBQ79616-Q116S monitor + balanceOpen part page →BQ79606A-Q16S monitor + protectorOpen part page →ISO7741-Q1reinforced digital isolationOpen part page →SN6505B-Q1isolated bias supplyOpen part page →AM2634-Q1real-time BMS MCUOpen part page →TMS570LS0432Model Y safety MCUOpen part page →TCAN1042-Q1CAN FD to vehicleOpen part page →12V / 48V railECU power inputSolid: cell measurement / controlDashed: isolated bias / safety path
measurement & controlisolated biassafety / network
BQ79616-Q116S main monitorBQ79606A-Q16S monitor/protectorISO7741-Q1quad digital isolationSN6505B-Q1isolated bias supplyAM2634-Q1real-time BMS MCUTCAN1042-Q1CAN FD transceiver

DESIGN DECISIONS

Four selection decisions

16S or 6S?

BQ79616-Q1 targets 6–16S high-voltage modules; BQ79606A-Q1 targets 3–6S. Fix cell count, daisy chain and isolation first.

Where does isolation sit?

ISO7741-Q1 isolates control/fault signals; SN6505B-Q1 provides isolated bias. Set isolation rating and creepage from the system safety concept.

Which MCU?

AM2634-Q1 fits real-time control and multi-channel BMS; Model Y's TMS570LS0432 is a safety co-processor example. Do not select on clock speed alone.

Is CAN just a transceiver?

TCAN1042-Q1 handles the physical layer; topology, termination, EMC and wake strategy must be verified with the BMS controller.

BMS signal-chain selection checks →BQ79606A vs BQ79616 →M01 vehicle heatmap →All P0 parts →AEC-Q100 grades →