TMP75C-Q1: When VIH>Vs

Koji Hayashi92

Mastermind 7030 points

Part Number: TMP75C-Q1

Hi TI-team

My customer wants to know if the IC is working properly when VIH>Vs.

The connections are shown in the general circuit diagram below.

The SDA is momentarily higher than Vs due to noise and other factors.

Vs = 3.3V SDA = 3.4V (only 200ns)

Does it work properly under the above conditions ?
Will there be problems such as IC destruction ?

Best Regards,

Koji Hayashi

over 5 years ago

0 Jalen Tate89 over 5 years ago

TI__Genius 9675 points

Hi Koji,

The SDA/SCL/ALERT lines can be pulled up to to a supply that is equal to or higher than Vs. If you expect SDA to be momentarily higher than Vs, as long as it is no higher than 6V, there will be no issue.

You should not expect to see any issue with the part from the conditions stated.

Jalen

0 Koji Hayashi92 over 5 years ago in reply to Jalen Tate89

Mastermind 7030 points

Hi Jalen-san

Thank you for response.

Are you looking at different IC datasheets ?

The absolute maximum rating of Vs is 4V and the recommended supply voltage is 3.6V.

Where did you refer to 6V ?

Best Regards,

Koji Hayashi

0 Jalen Tate89 over 5 years ago in reply to Koji Hayashi92

TI__Genius 9675 points

Hi Koji,

Thank you for pointing this out. I apologize, I was looking at the wrong datasheet. You have referenced the correct numbers. I will delete my original reply to avoid confusion. So to re-word my reply for clarity:

The SDA/SCL/ALERT lines can be pulled up to to a supply that is equal to or higher than Vs. If you expect SDA to be momentarily higher than Vs, as long as it is no higher than 3.6V, there will be no issue.

You should not expect to see any issue with the part from the conditions stated.

Jalen

0 Koji Hayashi92 over 5 years ago in reply to Jalen Tate89

Mastermind 7030 points

Hi Jalen-san

Thank you for quick response.

I understand.

I will answer to my customer.

Best Regards,

Koji Hayashi

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TMP75C-Q1: When VIH>Vs