SN65DSI84 - Failsafe function for ENpin, SCLpin and SDApin

Hirotaka Matsumoto

Other Parts Discussed in Thread: SN65DSI84

Hi all

Would you mind if we ask SN65DSI84?

What is Failsafe function for ENpin, SCLpin and SDApin?
Could you let us know the detail?(We could not find it on the datasheet.)
As the function, when chip supply is 0 V and when SDA, SCL or EN is 1.8 V, in this case, is the chip protected and the current per I/O is limited to a very small value?

And then, how much are Absolute maximum Ratings of SCL, SDA and EN? 2.175V(CMOS Input Terminals)?
Because, on our costomer circuit, it may be inputted the voltage to SCL, SDA and EN before power up(Vcc=1.8V).

We need your help.

Kind regards,

Hirotaka Matsumoto

over 8 years ago

0 Hirotaka Matsumoto over 8 years ago

Guru 27585 points

Hi team

Could you give us the reply?

Kind regards,

Hirotaka Matsumoto

0 Joel Jimenez0 over 8 years ago in reply to Hirotaka Matsumoto

TI__Mastermind 18655 points

Hello Matsumoto-san,

Sorry for the delayed response. Yes, EN, SCL and SDA terminals are protected when Vcc is 0V and the voltage in those terminals are up to 2.175 V. I have already asked the design group for more ditails on the failsafe feature of the EN, SCL and SDA terminals.

Regards

0 Hirotaka Matsumoto over 8 years ago in reply to Joel Jimenez0

Guru 27585 points

Joel san

Thank you for your cooperation.
We are waiting for your more ditails.

Kind regards,

Hirotaka Matsumoto

0 Joel Jimenez0 over 8 years ago in reply to Hirotaka Matsumoto

TI__Mastermind 18655 points

I/O pins will source or sink limited current or no current when chip supply voltage is not applied but voltage is applied on I/O pins.

The Absolute maximum Ratings of SCL, SDA and EN should be 2.175 V.

Regards

0 Hirotaka Matsumoto over 8 years ago in reply to Joel Jimenez0

Guru 27585 points

Joel san

OK, we got it.

Kind regards,

Hirotaka Matsumoto

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SN65DSI84 - Failsafe function for ENpin, SCLpin and SDApin