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BQ40Z50-R2: Issue with BLINKMIDPT during charge with 4 LED gauge

Pietro Vignali
Intellectual 925 points
Part Number: BQ40Z50-R2

Hello

in a new BMS board with bq40Z50-R2 and only 4 LEds I have an issue with BLINKMIDPT when in CHARGE.

Consider these settings:
BLINKMIDPT=ON
LED Hold Time = 4s
CHG Tresh1=0
CHG Tresh2=25
CHG Tresh3=50
CHG Tresh4=75
CHG Tresh5=100 (to keep it disable and avoid other LEDs to fluctuate due to charlieplexing)

If RSOC=33% when in Charge I have:
- LED1 = ON
- LED2 blinking fast at FLASH period (256 x 488us)
with the LED bar to stay ON for 4sec, then switch OFF for about 1sec, and then back ON again for another 4sec

If I remove BLINKMIDPT, setting the bit OFF, with same RSOC 33%, I have:
- LED1 = ON
- LED2 blinking normally at BLINK period (1024 x 488us)
with the LED bar  to stay always on during the all the charge session

Why BLINKMIDPT is causing the LED bar to continuously switch off ?

Thanks in advance
Pietro

  • 0
    TI__Guru** 105770 points

    Hello Pietro,

    Are there any safety events occurring that would affect the LEDs blinking?

    The BLINKMIDPT bit only enables blinking between the SOC values, it shouldn't affect any other operation.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Intellectual 925 points

    Hello Wyatt,

    no there aren't any safety events triggered.

    When in charge, if I simply clear the BLINKMIDPT bit, I immediately see the LEDs behaving correctly:

    with a RSOC of 33% I have the 1st LED (25%) solid on, and the 2nd LED blinking slowly, but always on, like it should be.

    It looks like that the effect of Flashing due to half 2nd LED capacity (BLINKMIDPT) and Blinking for charging activity (LEDCHG) create some noise and the LED bar switches off after LED HOLD Time.
    If BLINKMIDPT is clear everything is perfect.

    Pietro