Hello ST team,
I’m evaluating AEK-POW-BMS63EN with the AEK-POW-BMSHOLD. I’m seeing a bring-up problem where the pack voltage is correct but the board appears “dead” (no refs, no LEDs, SPI values = 0/NaN).
Setup
Boards: AEK-POW-BMS63EN (2 units available; this post is about the connection/reading behavior).
Battery holder: AEK-POW-BMSHOLD.
Cells: 18650 “INR 18650 MJ1”.
Population: progressed from 6S to 14S (final VBAT ≈ 50 V).
MCU/comms: AEK-MCU-C4MLIT1 + AEK-COM-ISOSPI1; UART 115200 to PC.
Firmware: AutoDevKit example reading cell/temperature; balancing disabled.
Power-up: mate the full holder connector once, with MCU unpowered; then power MCU and start SPI (no pin-by-pin hot-plugging).
Measurements (board powered by pack)
VBAT at the holder/connector: ≈ 50 V (matches cells).
VREF, VCOM and other reference rails on the BMS board: 0 V (some readings slightly negative).
LED indication: none (docs suggest at least one LED when VBAT > ~9 V).
SPI: V1…V14 = 0.000 V, T1…T14 = NaN (make sense since the temp sensors not used, B1…B14 = 0. (Terminal screenshots attached.)
What I’ve checked
Questions
On AEK-POW-BMS63EN + AEK-POW-BMSHOLD, can you confirm the exact mapping/order of C0…C14 between holder and board connector for 6–14 cells?
For fewer than 14 cells, how should unused cell inputs be handled—firmware disable only, or any termination/hardware requirement?
Is there any jumper (e.g., V_Ext, pre-charge/hot-plug network) that must be set for refs/LEDs to come up with pack power?
Any bring-up checklist you recommend before connecting a populated holder (e.g., resistance checks from each Cn to C(n-1), expected VREF/VCOM levels, etc.)?
