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lp5569 can not work

Other Parts Discussed in Thread: LP5569

hi all:

         first I config address 0 to 0x1h to enabled LP5569.  and set Led0_control_register ~Led8_control_register  0x4  ,LED is Powered by external power source .  and then I want to set  a value to  LED0_PWM(16h)  regitser,  but it can not set success,the read value of address 16h  is still 0.   The values of the other registers can be read and written normally.  the en/pwm pin is high level.  Now the light doesn't light up. I want to ask where the problem is?

                                                                                                                                                                                                             thanks!