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LM3632A: power-up sequence

Rodney Jones
Prodigy 600 points
Part Number: LM3632A
Other Parts Discussed in Thread: LM3632

Customer has  one question  about I2C of LM3632.

Customer will use 1.8V as I2C pull up source and pull down to zero in the standby mode.

So they are going to set power sequence from standby mode to LCD on.

VBAT is already applied,

Apply 1.8V to I2C pull up first and then after 1ms, EN signal high.

Please let me know if there is something needs to be fixed.

 

  • 0
    TI__Intellectual 2140 points
    Hi,

    If the EN pin is low all register values are reset to their default values (shutdown mode). Standby mode implies that the EN pin is high.
    If you want to maintain the register data after going from active mode to standby mode, the EN pin needs to stay high. The I2C pins can be at any state in standby mode.
    The proposed sequence will work as long as after completion of the sequence any non-default register data is written via I2C interface.

    Regards,
    Angelos