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Original question:
LSF0102: Vref_A power supply voltage changes when communication starts.
Hi Experts
Based on spec specification that LSF0102 I/O support push-pull and open-drain, May I follow spec application at Vref_A side without pull high for I2C bus?
Best
Regards
Brian
Hi Brian,
It depends on the application for push-pull or open-drain.
Applications will work fine for down translation without pull-ups. However, they will help if experiencing any signal integrity issues at higher frequencies.
I believe your case is not for multi-voltage translation.
Specifically for your I2C application (open-drain), the A side will be used for bi-directional open-drain drivers, hence pull-ups are required similar to the below.
Please see the down translation and up translation videos with the LSF and section 5.2 of Translation with the LSF Family for more information, thanks.
Best Regards,
Michael.
