TI E2E Community
Battery Management - Chargers Forum
BQ24072 USB Input Problem
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?
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.
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?
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.
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