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LP8556: system crash issue of LP8556

Jimmy Lai
Expert 6845 points
Part Number: LP8556

Dear Team,

We had another project reuse the LP8556SQ and face system crash issue once the host control BL via PWM.

Could you help to review schematic especially the RFset R150 / RIset R156 and L4?

BL LEDs are 2 lane 16~20.4V/20mA. System IO is 3.3V.

Please inform this LP8556 is PWM only type, no I2C access.

 

Or we need to configure via I2C (mount R159-160) and dimming via PWM only. If yes, any recommended reg table to us.

 

Base no I2C access -- 10KHz PWM @ duty 70~85% are crash.

 

Thanks a lot!

Jimmy