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DLPC3439: There is a very small probability that i write 3439 fail

Part Number: DLPC3439

At first I am ensure my IIC is reliable,In most cases,I can normaly communicate whit DLPC3439.But when I write quicklly or write mane times in pressure test,the DLPC3439 will write fail one time or two times or more.If it write LED enable fail,that is a  serious problem.