On LP3972 application note (literature Number: SNVA235):
The two I2C lines are pulled-up to 3.3V in reference design board.
On LP3972 data sheet (literature Number: SNVS468J):
It is stated in page 4/62 that the two I2C lines are pulled-up to 3.3V via IO source.
But on page 18/62 of data sheet, it is stated that the VIH of I2C lines are spec at VRTC max (which is 2.8V)
In this case, even the reference board design is violating the IC specification of VIH (max) = VRTC (2.8V).
Is there an update to the I2C maximum VIH voltage? The maximum VIH voltage should be 3.3V or the reference design is just not designed according to spec?
since the eval board were designed and tested using 3.3V, then the max VIH voltage should be 3.3V, datasheet need to be updated according to refrence design...
Hi Sheng Jin. Thanks for your fast reponse.
I think it depends on which power domain the I2C signals are tied to. If they're tied to Vin, then the VIH voltage should be VIN instead of VRTC. What do you think?
Will I be informed when data sheet is updated?
Thanks & regards
Yes, I think so. I will contact the right person to update the ds later..
Noted with thanks.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.