nPM1300 VBUS current limits

[vadima]

Hello.

1. The nPM1300 PS v1.1 states in Section 6.1.1 the fllowing: "The default current limit is IBUS100MA (100 mA)". But the values after reset in registers  VBUSINILIMSTARTUP and VBUSINILIM0 correspond to the 500mA limit:

What is the actual default VBUS current limits in the nPM1300?

2. Does the SYSREG set/reset the VBUS current limit value after the power source capability was detected.?

Best regards,

Vadim Aleynikov

[Naeem Maroof]

Hi Vadima,

I can see what you are referring to. But it also says that "Reset value from OTP, value listed in this table may not be correct."

It looks like the statement in the section 6.1.1 stands valid. Can you check what you are getting from your device? I will ask internally about it.

[vadima]

Hello Noeem,

> Can you check what you are getting from your device?

100mA.

And what about my second question:

"Does the SYSREG set/reset the VBUS current limit value after the power source capability was detected.?"

[Naeem Maroof]

Hello,

vadima said:

Does the SYSREG set/reset the VBUS current limit value after the power source capability was detected

The USB power source capability is detected by one CC line at a time, depending on the orientation of the USB plug on the device. Port detection via CC does not automatically update the VBUS current limit, as this has to be read by the host first and then later be updated. Hence, it's always the host that will configure the VBUS current limit.