/diy/ - Do It Yourself

Someone who has used the LM35 sensor,why most people convert the voltage to celcius using an ADC like

Tc = ((analogRead * Vref)/bitResolution)/0.01

where: -Tc is the temperature in celcius; and the 0.01 its because it goes like 10mv/ºC.
But the datasheet says that its from 2ºC to 150ºC, the way that Tc is written assumes that 0v => 0ºC right?
Wouldn't be more correct add a +2 as it implies that 0V => 2ºC(or less i guess) instead of 20mv => 2ºC? or did i get it wrong?