Hello,
I design USB HUB with TUSB2077APTR, schematic below.
I have problems with function. At first I don’t have 15k pull-up with 100nF capacitor to GND on nRESET pin -> no reset after power. LED D9 (run) lit-up with D8 (no port disabled), but D5 and D3 were lit-up -> PWRON ports were high (power-off).
Then I put 15k resistor to 3V3 and 100nF capacitor to GND to nRESET, TUSB2077 seems to be in inactive state. Only D3, D5, D7 LED lit-up poorly.
Where might be the problem?
Schematic cut-out:
