This min value is computed as: (0.5 * SCL tr) + (0.5 * SDA tr) and as a consequence depends on SCL input transition and SDA out load. set_output_delay -clock "i2c_scl_clk" -add_delay -min [expr (60 + ...

You can, of course, buy I2C ADC chips and modules, but when you’ve already got a microcontroller that has ADC peripherals on board, why bother? [Pawel] wired up a tremendously simple circuit ...