BQ25790: How to use this charger IC with USB data

Pasi Lassila

Part Number: BQ25790

I'm planning to use this IC in an NXP i.MX8 platform. The device has one USB port for charging and data.

How does USB data work with this charger IC BQ25790?

I guess I also need an USB switch IC to disconnect the D+/D- from the charger IC and connect to the application processor.

over 4 years ago

0 Jeff F over 4 years ago

TI__Guru**** 166086 points

Hi Pasi,

The charger only access the USB D+/D- lines when power is first applied for up to 2s in order to detect the input power source capability. After that, it returns to HiZ and other devices can use the bus. If you can prevent the other devices from using the D+/D- bus until then, you will not need a USB switch.

Regards,

Jeff

0 Pasi Lassila over 4 years ago in reply to Jeff F

Prodigy 55 points

Thanks for the answer. The CPU can be unpowered when connecting the USB cable so I will add a USB switch.

Power management

Power management forum

BQ25790: How to use this charger IC with USB data