Dear Team:
Q1. U6 enable should change to P3V3, not P3V3_AUX ? ?
What would happen if U6 EN pull up to P3V3_AUX ? Is it not allowed? èWhat is different between P3V3 and P3V3_AUX? It is ok about VCCA=VCCB=3.3V.?
note: power sequence: P3V3_AUX à P3V3 à P1V8 è I think the turn on delta time is around us, right??
P3V3_AUX is standby power, P3V3, P1V8 are main power, need push power button to power on from standby power to main power, it usually takes few seconds or longer to power on.
Are Q1, Q2 still ok? If P3V3_AUX power on but P3V3 not, would it have electric leakage from P3V3_AUX to P3V3 due to wrong power up sequence of TCA9517?
Q2. U5 enable pull up to P3V3_AUX.
Pull up sequence: VCCB and EN pull up to P3V3_AUX first, than VCCA pull up to P1V8 ?
Is the pull up sequence ok? Would it cause any problem? èIt is OK. ?
P3V3_AUX – few seconds or longer à P3V3 --few usà P1V8
U5 EN PU to P3V3, Is it ok ?
U6 EN PU to P3V3, is it ok? ( maybe there are few mV between P3V3 and P3V3_AUX, Is that ok? What is the allowed max voltage gap between VCCB and EN ?)