In this paper, we propose an alternate electrical-only strategy to perform both test and calibration of MEMS convective accelerometers' sensitivity. The idea is calibrate device sensitivity through the adjustment of the power dissipated in the heater element. For this, the system is equipped with an on-chip programmable digital pulse modulated generator and an iterative search procedure based on simple impedance measurements is implemented. The method is evaluated through Monte-Carlo simulations considering typical process variations and results are presented to demonstrate the potentialities of the technique.