BQ79600-Q1: Error flag when PING

Yuto Kitamura

Part Number: BQ79600-Q1
Other Parts Discussed in Thread: ISOW7742, BQ79600EVM

Tool/software:

Dear team,

My customer found the error(HB_FAST) is asserted when PING is sent to BQ79600-Q1(EVM). We are referring the application note below, but we are not sure when we have to clear the error. Can I know when they can clear the error? Now they clear error after all setting is done. After that they do not see any error flag.

https://www.ti.com/lit/an/sluaa17a/sluaa17a.pdf

Best regards,
Yuto

7 months ago

0 Abdelrahman Aldmour 7 months ago

TI__Intellectual 1520 points

Hey Yuto,

I will get back with you on this.

Best regards,

Abdel

0 Yuto Kitamura 7 months ago in reply to Abdelrahman Aldmour

TI__Expert 6455 points

Thanks, look forward to the update.
Yuto

0 Yuto Kitamura 7 months ago in reply to Yuto Kitamura

TI__Expert 6455 points

Wait for the update. Thank you.

Yuto

0 Yuto Kitamura 7 months ago in reply to Yuto Kitamura

TI__Expert 6455 points

Hi team,

Any update on this?

Yuto

0 Yuto Kitamura 7 months ago in reply to Yuto Kitamura

TI__Expert 6455 points

I need your help.

0 Esteban Davila 6 months ago

TI__Prodigy 90 points

Yuto,

The ping is being sent by an MCU via UART or SPI? If UART, how long is the RX being pulled low?
What is the Pull-up resistor value for the RX pin to VIO?
What devices are being used as a stack and what isolation is between the BQ79600 and the 1st stack device?

Best Regards,

Esteban

0 Yuto Kitamura 6 months ago in reply to Esteban Davila

TI__Expert 6455 points

Hi Esteban

Esteban Davila said:
The ping is being sent by an MCU via UART or SPI? If UART, how long is the RX being pulled low?

>> UART is used and 2.75ms. They also tried 2.25ms before.

Esteban Davila said:
What is the Pull-up resistor value for the RX pin to VIO?

>> They use EVM so 10kohm.

Esteban Davila said:
What devices are being used as a stack and what isolation is between the BQ79600 and the 1st stack device?

>> They use EVM so trans is used.

Best regards,
Yuto

0 Abdelrahman Aldmour 6 months ago in reply to Yuto Kitamura

TI__Intellectual 1520 points

Hi Yuto,

Yuto Kitamura said:
>> UART is used and 2.75ms. They also tried 2.25ms before.

2.25 ms should be low as the average should be between 2.5ms and 3ms from the datasheet.

Yuto Kitamura said:
>> They use EVM so trans is used.

Could you provide more details about the connection used. Was the customer stacking other EVMs with the BQ79600?

Regards,

Abdel

0 Yuto Kitamura 6 months ago in reply to Abdelrahman Aldmour

TI__Expert 6455 points

Dear Abdel,

Abdelrahman Aldmour said:
2.25 ms should be low as the average should be between 2.5ms and 3ms from the datasheet.

>> 2.75ms is used now. They used 2.25ms without using BQ79600-Q1 (now: MCU - BQ79600 - BQ79656, previous: MCU - ISOW7742 - BQ79656).
Thus it will not be the problem now.

Abdelrahman Aldmour said:
Could you provide more details about the connection used. Was the customer stacking other EVMs with the BQ79600?

No, they connect BQ79600EVM + customer board (BQ79656*1pc).

Please provide us how to avoid this error.

Also please check my original question as well.
- If when they see the error when ping, when should they clear the fault?

Best regards,
Yuto

+1 Abdelrahman Aldmour 6 months ago in reply to Yuto Kitamura

TI__Intellectual 1520 points

Hi Yuto,

There is no timing related to when to clear the fault, the fault can be cleared as soon it seen.

Regards,

Abdel

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BQ79600-Q1: Error flag when PING