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LP5521 VOUT voltage

Other Parts Discussed in Thread: LP5521

Hi Team,

The LP5521 schematic is as below and customer follow below procedure to write registers

  1. Write to address 00H 0100 0000b
  2. Write to address 08H 0101 0001b

 Then found Vout voltage is 1.6V, not 4.5V. Is this correct voltage?

Thanks

Sam

  • Hi Sam,

    You should get 4.5V after that two i2c write in step 1 and 2. Are the i2c write successful ? i.e. did you get an ACK from LP5521? Can you confirm the i2c address use is 0x32 (7bit address) since both ADDR_SEL pin are connected ground.

    I did not see the pull up resisters for SCL and SDA, make sure SCL and SDA are pull up to 3,3V via some resisters.

    If you can observe both SCL, SDA signal against EN signal on the scope, make sure the host performs i2c write after EN goes high.

    Regards
    H L