BQ25895: Issue updating IINLIM bits

Olivier Coutureau1

Part Number: BQ25895

Hi,

I'm using the input source type detection feature of the BQ25895 in order to detect standard and non-standard chargers.

I'm using VBUS_STAT bits (reg 0x0B) to get the USB input type. In case of a non-standard adapter, I use additional IINLIM bits (reg 0x00) to differentiate 1A/2A/2.1A/2.4A adapters.

This works fine when the USB charger is plugged in before application starts. In case the charger is plugged after application starts or if the charger is plugged off and plugged back in, the VBUS_STAT bits are updated but not the IINLIM bits.

I'm using the BQ in host mode and I have AUTO_DPDM_EN set to 1.

What is it possible to do in order for the BQ to update the IINLIM bits when a USB charger is plugged in, and not only VBUS_STAT bits ?

Thanks in advance for your help.

Oliver

over 5 years ago

0 Ning T over 5 years ago

TI__Guru 57341 points

Oliver,

Referring to 8.2.3.3 Input Source Type Detection on the d/s, only when AUTO_DPDM_EN is disabled, the Input Source Type Detection is bypassed. The Input Current Limit (IINLIM) register, VBUS_STAT, and SPD_STAT bits are unchanged from previous values. Please double-check your set-up.

Thanks,

Ning.

0 Olivier Coutureau1 over 5 years ago in reply to Ning T

Prodigy 30 points

Hi Ning,

Thanks for your answer.

In my case, I did enable AUTO_DPDM_EN bit and only the VBUS_STAT and SDP_STAT bits are updated when a USB is plugged in.

My concern is that the Input Current Limit (IINLIM) is not updated. In fact, the only time the IINLIM bits are set is at startup but it is not updated after a hot plugging, unlike VBUS_STAT and SDP_STAT.

Thanks,

Oliver

0 Ning T over 5 years ago in reply to Olivier Coutureau1

TI__Guru 57341 points

Oliver,

If the 1st adaptor and the 2nd adaptor have the same default IINDPM setting, it is hard to see the IINDPM changes. Since VBUS_STAT and SDP_STAT are updated, the IINDPM should be updated also. Please try to re-plug in a significantly different adaptor.

Thanks,

Ning.

0 Olivier Coutureau1 over 5 years ago in reply to Ning T

Prodigy 30 points

Ning,

Thanks for your repsonse.

I've tried different configurations with standard and non standards adaptors (SDP/CDP/Apple 2.0A/Apple 2.1A/Apple 2.4 A) and I made sure not to plug the same adaptor two time in a row.

Oliver

0 Ning T over 5 years ago in reply to Olivier Coutureau1

TI__Guru 57341 points

Oliver,

So the problem is resolved?

Thanks,

Ning.

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BQ25895: Issue updating IINLIM bits