An interface circuit for data transmission and the method thereof is described. The first stage and second stage are operatively coupled to a first and second power supply. The new firmware is loaded and executed in response to a boot procedure of the communication device. An overburden sensor extends downwardly from the stem senses total liquid thickness of the liquid above the overburden sensor. Since components of each of the feedback compensations circuits are biased at a regulation voltage instead of a higher power supply voltage, the control circuit may switch between control modes with minimal delay.