VOL for I2C lines at IOL 3mA

[Arumugam1982]

Hello,

This is Arumugam. May I know the VOL max voltage to consider for I2C lines. Should I consider as 0.7V @1mA or 3mA

Thanks

Arumugam

[VaneB]

Hi @Arumugam1982 

The VOL/VOH levels for the I2C lines depend on the pad supply rail and the corresponding electrical specification of the selected pin configuration. The LPI2C pads can be supplied from either VDD_HV_A or VDD_HV_B, depending on the pin muxing and pad assignment, so this should be verified using the device IOMUX information.

The datasheet defines the input thresholds (VIH/VIL) directly in the GPIO DC electrical characteristics tables. However, VOH/VOL are usually defined indirectly through the output drive current conditions, such as IOH and IOL.

In practice, the recommended approach is to rely on the VOH/VOL conditions linked to the corresponding IOH/IOL parameters for the selected pad configuration, rather than assuming a specific current value (mA). A specific current should only be used if it is explicitly defined in the datasheet for that electrical characteristic.

BR, VaneB

[Arumugam1982]

Should I consider the same VOL for IOL -1mA /3mA /8mA. I need this number for my WCA calculation.

[john_floros]

Hello,

Which Symbol are you using in the data sheet from Table 27 (ex. IOL_33_S)?

Regards,

John