BQ24190: Shipping Mode Issue.

Chun Youngsu

Expert 2485 points

Part Number: BQ24190

Dear TI Team,

I am using the BQ24190.

However, the following symptoms have occurred and will be asked.

Currently, we are mass-producing the product using BQ24190, and after activating the shipping mode of BQ24190,

there is a problem that can not be released in the part where VIN is connected and released.

We are not all a problem, but only in some products.

Understanding Shipping Mode I understand that shipping mode is released when VIN is entered. Do you have any other restrictions?

The symptom now is that even if VIN is input, shipping mode is not released, but after disconnecting the battery and reconnecting, we confirmed that Shipping Mode is released.

Please reply.

Thanks.

over 6 years ago

0 ezhao over 6 years ago

TI__Genius 10240 points

Chun,
Where is the pull up voltage of SCL and SDA coming from? Can you provide a screen capture of VSYS, SCL and SDA when the shipping mode command is issued and VSYS starts to drop?
Regards,
Eric

0 Chun Youngsu over 6 years ago in reply to ezhao

Expert 2485 points

Dear ezhao,

Using the VSYS voltage of BQ24190, the voltage output from the 3.0V LDO is used as the pull-up voltage.

Is shipping mode entered by I2C Command, but is I2C related when BQ24190 Shipping Mode is unset?

Thanks.

0 ezhao over 6 years ago in reply to Chun Youngsu

TI__Genius 10240 points

Chun,

This is likely what happened. Please refer to the Figure (a). The 9th bit of the SHIP Mode command is ACK. A STOP should be issued after the ACK. There is no time limit in I2C protocol for the delay between ACK and the next command. However, the STOP might no be executed as shown by Figure (b) because the SCL and SDA pull up from the VSYS is gone. The charger state machine keeps waiting for the STOP in the SHIP mode.

To avoid SHIP mode exit issue, the STOP should be executed before the pull up of SCL and SDA is gone due to Q4 OFF. We suggest to execute the STOP sequence from the host within 50 uS after executing the SHIP mode command when the pull up will be gone as shown by Figure (a).

0 Chun Youngsu over 6 years ago in reply to ezhao

Expert 2485 points

Dear Eric,

thank you for answering.

Is this what you said when you set up Ship Mode? Are you talking about unsetting?

Is there a separate Guide document for setting up Ship Mode? Is it possible to deliver documents with contents such as I2C settings and Timming?

please check.

Thanks.

0 ezhao over 5 years ago in reply to Chun Youngsu

TI__Genius 10240 points

Chun,

I talked about setting the charger in the Ship Mode. Once the Ship Mode is activated, the VSYS drops to zero and the STOP sequence can't be executed. The charger can't exit the Ship Mode because the issue during setting the Ship Mode.

0 Chun Youngsu over 5 years ago in reply to ezhao

Expert 2485 points

Dear Eric,

1) Power supply sequence is as follows.
It operates as adapter -> BQ24190 -> MCU LDO -> MCU.

2) BQ24190 It is a way to apply VSYS power and apply MCU power.

How to execute Ship Mode STOP Command within 50us to disable shipping mode Can you check it?

Thanks.

Power management

Power management forum

BQ24190: Shipping Mode Issue.