BQ4050: BQ4050 use 4 LEDs issue

Star Xu

Part Number: BQ4050

I design with BQ4050 and use 4 LEDs, LED CHG THRESH1 is 0%，CHG THRESH2 is 25%，CHG THRESH3 is 50%，CHG THRESH4 is 75%，CHG THRESH5 is 100%.

The LEDs display is normal during the charging test. When the RSOC reaches 100%, LED2 and LED4 will flash, LED1 and LED3 are always on and normal. There is no such problem when testing with 5 LED lights.

I didn't set the LEDPF bit, only set the LDECHG bit.

How to turn off the LED2 and LED4 blink issue?

Thanks

Star

over 2 years ago

0 Wyatt Keller over 2 years ago

TI__Guru** 105590 points

Hello Star,

Please see this thread for more information: https://e2e.ti.com/support/power-management-group/power-management---internal/f/power-management---internal-forum/1075521/bq40z50-r2-varta-leds-are-pulsing-when-they-should-be-on/3985961?tisearch=e2e-sitesearch&keymatch=bq40z50%20led%20pulsing#3985961

Sincerely,

Wyatt Keller

0 Star Xu over 2 years ago in reply to Wyatt Keller

TI__Genius 9645 points

Hi Wyatt

Thanks for your reply.

The customer follow the steps and change the CHG thresh5 101%, but when charge full the LED4 began to blinking.

Attached the gg fileBQ4050-3S.gg.csv

please give some suggestions.

Thanks

Star

0 Wyatt Keller over 2 years ago in reply to Star Xu

TI__Guru** 105590 points

Hello Star,

With the LEDCHG configured the gauge will try to blink LED5 so the LED4 threshold would need to be set so it doesn't blink until full charge, the final threshold for LED4 should be 100%.

Sincerely,

Wyatt Keller

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BQ4050: BQ4050 use 4 LEDs issue