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?
Kindly enlighten
Hi,
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.
Regards