Stop Routing Commands

flux

I’ll resize the PCB to a 700mm × 100mm rectangular outline, then arrange the six ADBMS6830/filter-network blocks linearly along the long axis and verify placement issues afterward.

flux

Board sizing has been applied; I’m now placing the six ADBMS6830 sections as a left-to-right linear chain with each IC’s cell-filter ladder kept nearby.

flux

Implemented the elongated AFE placement.
  • Applied a rectangular board outline request for 700mm × 100mm, but layout readback still reports 500mm × 100mm despite accepting the 700mm rule; I flagged this as a platform mismatch.
  • Arranged the six ADBMS6830 ICs linearly along the board: IC1 → IC2 → IC3 → IC4 → IC5 → IC6.
  • Clustered the 96S cell-filter networks around their corresponding AFE blocks.
  • Kept MCU/CAN circuitry near the low-voltage/IC1 side.
  • Placement review shows no overlap/protected-area/missing-footprint issues.
  • Remaining checks are expected unrouted airwires because routing has not been started.
Please confirm the board-size readback issue before routing; I should not route until the outline is definitely correct.
Confirm board outline
Explain size issue
Run placement review
Improve AFE spacing
Check manufacturing limits
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Integrated CMU/BMU Schematic Notes
Updated: 2026-06-03
Architecture Scope
This schematic has been redesigned toward a single Integrated CMU/BMU Board for the UAM redundancy architecture. The board is intended to monitor 3 sub-modules totaling 96S and support Master/Slave BMU control tasks using one S32K344 MCU.
AFE Scaling
  • Total ADBMS6830 AFE IC count is now 6: IC1 through IC6.
  • Each ADBMS6830 block monitors one 16-cell segment.
  • Total monitored cell span: 6 × 16 = 96 series cells.
  • New AFE assignments:
    • IC4: cells 49-64
    • IC5: cells 65-80
    • IC6: cells 81-96
Cell Voltage Filter Networks
Each new AFE block follows the existing ADBMS6830 filter convention and datasheet guidance:
  • 17 × 200 Ω series cell tap filter resistors per AFE block.
  • 16 × 10 nF differential filter capacitors per AFE block.
  • 1 µF bypass capacitors on VREG, VREF1, and VREF2 per new AFE.
  • New cell tap nets are named AFE4_CELL_TAP_00..16, AFE5_CELL_TAP_00..16, and AFE6_CELL_TAP_00..16.
ADBMS6830 Communication Chain
The existing chain has been extended from 3 AFEs to 6 AFEs:
  • Existing MCU-to-IC1 4-wire SPI interface retained.
  • IC1 Port B → IC2 Port A.
  • IC2 Port B → IC3 Port A.
  • IC3 Port B → IC4 Port A.
  • IC4 Port B → IC5 Port A.
  • IC5 Port B → IC6 Port A.
  • IC6 Port B is terminated with a 50 Ω differential termination resistor.
Notes:
  • This preserves the existing S32K344-to-first-AFE control structure while extending the ADBMS daisy chain.
  • IC4, IC5, and IC6 have ISOMD tied to VREG for isoSPI mode.
Internal Redundant CAN
Added an automotive-grade CAN FD transceiver:
  • U2: TI TCAN1043ADRQ1.
  • MCU CAN nets:
    • MCU_CAN_TX: S32K344 PTB2 → U2 TXD.
    • MCU_CAN_RX: U2 RXD → S32K344 PTB3.
  • CAN bus nets:
    • INTERNAL_CAN_H
    • INTERNAL_CAN_L
  • Termination:
    • R106 = 120 Ω between CANH and CANL.
  • Logic rail:
    • U2 VIO connected to MCU_IO_VDD.
  • CAN transceiver supply placeholders:
    • CAN_5V for U2 VCC.
    • CAN_VSUP for U2 VSUP.
Important follow-up: the current schematic does not yet show a complete CAN_5V/CAN_VSUP power source. These rails must be tied into the final BMU power architecture before layout/routing.
Relay Control Outputs
Two S32K344 digital output nets were exposed:
  • CONTACTOR_CTRL_DO: S32K344 PTB4.
  • PRECHARGE_RELAY_CTRL_DO: S32K344 PTB5.
These are logic-level control nets only. External high-side/low-side relay drivers, flyback protection, diagnostics, and safety interlocks still need to be added before this can directly drive contactor or pre-charge hardware.
Open Engineering Items
  1. Confirm S32K344 pin-mux assignments for PTB2/PTB3 as the selected CAN TX/RX pair.
  2. Add or confirm the board power tree for CAN_5V, CAN_VSUP, MCU_IO_VDD, and AFE support rails.
  3. Add contactor/pre-charge driver stages with appropriate isolation/protection if these outputs leave the low-voltage logic domain.
  4. Decide whether the first AFE should remain direct SPI from the MCU or be converted to a fully isolated isoSPI front-end using an isoSPI master/transformer interface.
  5. Add external connectors/harness definitions for all 96 cell taps and internal CAN if not already handled elsewhere.

    Architecture Scope

    AFE Scaling

    Cell Voltage Filter Networks

    ADBMS6830 Communication Chain

    Internal Redundant CAN

    Relay Control Outputs

    Open Engineering Items

Documents

    Integrated CMU/BMU Schematic Notes

Assets

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32S3P CMU AFE Board

32S3P CMU AFE Board thumbnail
CMU board for a 32S3P battery sub-module in a 192S3P system, using ADBMS6830 multicell AFE ICs daisy-chained by isoSPI to a single S32K344 MCU.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$115.38–$118.44

Digi-Key

$26.68

LCSC

$31.30

Mouser

$23.95

Verical

$11.28–$19.70

Controls