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TLC2558: Cannot read CFR data

Part Number: TLC2558

Dear expert,

Customer face to some issue about reading CFR data.

They write 0xA0C0 to sweep mode, and want to read 0x9000 to verify if their setting is correct or not.

But it failed with readind 0x9000.

Could you share your comments about this issue? thanks.

Regards,

Ben