My customer is considering using ADP 5080 and received a question.
REG 2 is used for VDDIO and another DCDC regulator is used for I2C pull-up.
When the EN pin was set to H, the power supply sequence did not start and was not output.
# 1 I referred to "If VDDIO is supplied by VREG2, SCL must be high impedance until VREG2 rises above the POR
threshold." described in the data sheet.
How can I make SCL high impedance?
Should I pull up SCL to H?
#2 Is there a sequence diagram showing the timing of VDDIO and I2C startup?