TUSB320: I2C DEBOUNCE register bit

Toshiro Imi

Part Number: TUSB320

Hello,

Our customer has questions about DEBOUNCE register bit and the specification mismatch as well as I2C reset condition.

Although tCCCB_DEFAULT specify 168ms at DEBOUNCE register=2'b00, it also specify 133ms (default) in the I2C register bit Table 7, as shown in below. Could you help him which number is correct default DEBOUNCE time.

Could you also help him if I2C registers are default once VDD is shut down.

Best regards,

over 3 years ago

0 Malik Barton57 over 3 years ago

TI__Guru 64326 points

Hi,

The timing is 168 ms for TUSB320, this is a typo. Please refer to TUSB320LAI datasheet linked below. I recommend using our latest TUSB320LAI as well. I2C registers are reset to their defualt vaule at power down or when EN/EN_N is toggled.

https://www.ti.com/lit/ds/symlink/tusb320lai.pdf

0 Toshiro Imi over 3 years ago in reply to Malik Barton57

TI__Expert 7260 points

thank you very much.

DEBOUNCE default time is 168ms, and I2C registers are reset to default at power down.

I would like to know the reason you recommend TUSB320LAI. This customer uses as UFP only. are there any benefit in TUSB320LAI.

Best regards,

0 Malik Barton57 over 3 years ago in reply to Toshiro Imi

TI__Guru 64326 points

TUSB320LAI is our latest. Main benefits would be lower power consumption and other fixes for current detection is using I2C or GPIO mode.

0 Toshiro Imi over 3 years ago in reply to Malik Barton57

TI__Expert 7260 points

I have checked DEBOUNCE setting differences between TUSB320 and TUSB320LAI, then found out that setting is completely different. Do I understand that TUSB320 DEBOUNCE is fully met with that of TUSB320LAI as shown in below. Besides, are there any missing or incorrect specification in TUSB320 datasheet.

[ incorrect ] TUSB320

2'b00 =133ms (default), 2'b01=116ms, 2'b10=151ms, 2'b11=168ms

[ correct ] TUSB320LAI

2'b00=168ms (default), 2b=01=118ms, 2'b10=134ms, 2'b11=152ms

0 Malik Barton57 over 3 years ago in reply to Toshiro Imi

TI__Guru 64326 points

I am looking into the full details here and will get back to you next week.

+1 Malik Barton57 over 3 years ago in reply to Malik Barton57

TI__Guru 64326 points

Hi,

I confirmed TUSB320 behavior is different from TUSB320LAI here. The I2C settings listed are correct for TUSB320 and the EC table will be updated to reflect this.

0 Toshiro Imi over 3 years ago in reply to Malik Barton57

TI__Expert 7260 points

Thank you very much.

Please let me know if you finish to revise TUSB320 datasheet EC table.

Best regards,

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TUSB320: I2C DEBOUNCE register bit