TPS65987D: FRS with BQ25723

chris woodhouse

Part Number: TPS65987D
Other Parts Discussed in Thread: BQ25723, BQSTUDIO

I have a TPS65987D with GPIO13 connected to the VAP/OTG/FRS pin of a BQ25723 and is pulled up to the 3V3_LDO via a 10k external resistor.

I have enabled the EN_FRS bit in the BQ25723 register 0x3e.

I have configured the registers as per SLVAE20.pdf with my existing configuration project in the TPS6578x application customization tool.

But I don't observe and FRS like event on VBUS when I connect a USB-C hub that claims to be PD3.0 compliant. I observe a power role swap event where the VBUS line drops to 0V then back to the VBUS depending on the external source connected to the hub.

I have a number questions:

what event must I map the GPIO to in order to enable the BQ25723 to work in FRS mode?
in my previuos config file I configured the EN_OTG bit in the BQ25723 register 0x34 to be enable/disabled whenever there was a attach/detach event. Do I need to keep doing this?
when are you going to update the battery management studio for the BQ25723?
When are you going to complete the missing pop-up dialogue information in the customisation tool?
where is there a suitable explanation of all the GPIO events? your current offerings in slvubh2b.pdf do not cover all events listed in GPIO config drop downs.

over 3 years ago

0 Chuck Branch over 3 years ago

TI__Mastermind 32891 points

Chris,

I am going to answer the TPS65987D portions, then pass this issue onto the BQ team to address the BQ25723 questions

A4: What is the missing pop-up that you are describing? I have not noticed one.

A5: The TRM describes to production supported I2C Events. We regularly add I2C events to meet specific customer needs, but they are not intended for wide use, so the documentation lags

Regards,

Chuck

0 Pengzhao Zhu over 3 years ago in reply to Chuck Branch

TI__Genius 11385 points

Hi Chris,

I believe your question 1 and 2 and related to the system overall and not just the charger.

For the charger operation, please refer to the following from the datasheet:

"OTG/VAP/FRS" pin description - "When OTG_VAP_MODE=1b and EN_FRS=1b, pulling high this pin can enable FRS mode in forward operation."

For Question 3, please see attached BQZ.

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/138/Charger_5F00_1_5F00_00_2D00_bq25723.bqz

Please copy this file to the “config” section of “BatteryManagementStudio”. You can find this path in the location where you installed BQStudio.

Handing it back to the controller team.

Thanks,

Peng

0 chris woodhouse over 3 years ago

Prodigy 100 points

Hi Chuck,

I'm talking about these:

granted some are self explanatory, but some are vague enough to require some sort of explanation as to what it does.

In regards to A5: ok, I don't quiet understand by "specific customer needs". I thought you guys would dictate functionality? In any case, could I get an explanation as to what these events do or are active on?

regards,

chris

0 chris woodhouse over 3 years ago in reply to Pengzhao Zhu

Prodigy 100 points

Thanks for that config file Peng! Makes viewing the registers much easier!

Can you clarify what "forward" is with respect to the sources? Is it the battery powering the input to the charger? or is it VBUS charging the battery?

0 Pengzhao Zhu over 3 years ago in reply to chris woodhouse

TI__Genius 11385 points

Hi Chris,

Forward mode for BQ25723 is VBUS powering VSYS or charging battery. Power delivery from battery to VBUS is usually referred to as OTG mode. Please see below from datasheet:

Thanks,

Peng

0 Chuck Branch over 3 years ago in reply to chris woodhouse

TI__Mastermind 32891 points

Chris,

I will get the definition of these events to you. It will take me a few days at my current loading.

0 Chuck Branch over 3 years ago in reply to Chuck Branch

TI__Mastermind 32891 points

Chris,

This was lost in my queue for quite a while.

I still need a day to get these definitions, but I will respond back to you on Monday.

0 chris woodhouse over 3 years ago in reply to Chuck Branch

Prodigy 100 points

Hi Chuck,

How are those definitions coming along?

0 Chuck Branch over 3 years ago in reply to chris woodhouse

TI__Mastermind 32891 points

Chris,

I have had to set a broader net for the information. The person I need to get the answer from is out of the office until after the first of the year, so I have reached out to the development team.

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TPS65987D: FRS with BQ25723