TMP100: Spec Question

Connor Connaughton

Part Number: TMP100

Hello,

I have a question below on the TMP100.

Base on how it spec below, can I connect V+ to 3.3V and using pull up to 5V (assume the VIL will be below 1V and VIH = 5V) and device will functioning without latch-up or damage?

Thanks!

Connor

over 2 years ago

0 Eddie LaCost over 2 years ago

TI__Mastermind 38590 points

Hello Connor,

The I2C pins(SDA/SCL) on the device are open drain and should be pulled up externally with a resistor. Since these are open drain, they are not tied to the internal supply and voltages higher than the supply can be used.

Note that the ADD0/ADD1 pins must be tied to GND, V+, or floating.

0 Connor Connaughton over 2 years ago in reply to Eddie LaCost

TI__Expert 4460 points

Hi Eddie,

Thank you for the quick reply!

For AD0/1, I will ensure it is GND, V+ or floating.

But for SDA, SCL pull up, the spec does indicated the VIH can he higher than max V+ (5.5V). That is why I would like to confirm if the SDA/SCL has a different structure that allow we use V+ = 3.3V while I2C pull up to 5.0V.

Thanks!

Connor

+1 Eddie LaCost over 2 years ago in reply to Connor Connaughton

TI__Mastermind 38590 points

Yes, the datasheet is correct. SDA/SCL can be pulled up to higher voltage(6V max) with 3.3V supply.

0 Connor Connaughton over 2 years ago in reply to Eddie LaCost

TI__Expert 4460 points

Thanks Eddie!

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TMP100: Spec Question