TUSB564: TISB564 fail part

Fred Cheng

Part Number: TUSB564

Hi team,

there are some FA report request from customer since there're 20pcs TUSB564 that has wrong resistance in TXp and TXn

my question is would this affect I2C communication? since their I2C report is NACK now

0 Brian Zhou over 3 years ago

TXP/RXP will not affect I2C communication, maybe SCL/SDA pin failed too. Pls contact local CQE for quality sopport.

Regards

brian

0 Fred Cheng over 3 years ago in reply to Brian Zhou

Hi Brian,

do you see any potential risk that may damage TX1n and TX1p on the layout ( red circle is TX1n,p)

they may face some EIPD symptom, any recommendation for this?

0 Brian Zhou over 3 years ago in reply to Fred Cheng

layout looks normal ,are there ESD protection device on TX1/RX1?, if not , plug in/plug out could damage the device.

0 Fred Cheng over 3 years ago in reply to Brian Zhou

Hi Brian,

I understand TX/RX may suffer EIPD, but SDA/SCL is internal signal I can't see why it's also malfunction.

and you said these two are not related.

any idea why I2C NACK? or any signal you still want me to check other than TX/RX?

0 Fred Cheng over 3 years ago in reply to Fred Cheng

Hi Brian,

any update?

0 Brian Zhou over 3 years ago in reply to Fred Cheng

If the ESD damage in Vdd , the damage could affect other pins too.

Regards

brian

0 Fred Cheng over 3 years ago in reply to Brian Zhou

Hi Brain,

they said the VCC can behave normal, no shorting .

0 Brian Zhou over 3 years ago in reply to Fred Cheng

Fred:

It's fast to go though FQE process to find the root cause of this issue.

Regards

Brian

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