BQ25895M: what if i don’t use D+ D-？

Gary Gaooo

Intellectual 775 points

Part Number: BQ25895M

Hi TI experts,

my customer want the BQ25895M can charge the battery without D+D-

IF I Write 0 to AUTO_DPDM_EN

Is that mean it’s ok not to connect D+D-，and let D+D- float？

over 5 years ago

0 Jeff F over 5 years ago

TI__Guru**** 166106 points

Hi Gary,

We generally recommend to short D+=D- and use ILIM resistor to set input current limit at start up.

Regards,

Jeff

0 Gary Gaooo over 5 years ago in reply to Jeff F

Intellectual 775 points

Hi Jeff,

thank you for your help

To short D+=D-, is that means that the input source can only have VBUS without D+ and D-?

0 Jeff F over 5 years ago in reply to Gary Gaooo

TI__Guru**** 166106 points

Hi Gary,

Correct. If D+=D- are shorted at the IC then they cannot be connected to external adapter. If a USB adapter is connected, the charger will pull input current up to the ILIM resistor clamp value. If that is too much for the adapter VINDPM prevents adapter crash.

Alternatively, you can let D+/D- float and IINDPM register will set to 500mA.

Regards,
Jeff

Power management

Power management forum

BQ25895M: what if i don’t use D+ D-？