Captured to BQ24072 USB Input Problem wiki page

BQ24072 USB Input Problem

JerryLin

Other Parts Discussed in Thread: BQ24070, BQ24072

bq24070/1 offers a proprietary boot-up sequence. On the first application of power to the bq24070/1, this feature enables the 100-mA USB charge rate

for a period of approximately 150 ms.

For BQ24072, if we fix EN2 EN1 = 0 1, can it meet the USB IF specification of 100-mA USB current during USB Enumeration? Or EN1 should be changed dynamicly?

over 14 years ago

0 Charles Mauney over 14 years ago

TI__Mastermind 31120 points

It should probably be done dynamically. The part does come up in 100mA mode to check for shorts and runs some routines but changes to the EN2/1 setting soon after it is finished with the power up. If you want it to stay in 100ma mode, then you need to set EN2/1 to 0/0.

0 JerryLin over 14 years ago in reply to Charles Mauney

Prodigy 180 points

If we want to work in USB500 Mode, could we fix EN2/1 to 0/1. Will BQ24072 come up in 100mA mode during USB enumeration to meet USB IF current specification?

0 JerryLin over 14 years ago in reply to JerryLin

Prodigy 180 points

That is to say, If we want to work in USB500 Mode, could we fix EN2/1 to 0/1? Or we should set the device in USB100 mode first, and then changed to USB500 mode after USB Enumeration.

Power management

Power management forum

BQ24072 USB Input Problem