This module will now take a look at power consumption and its relationship to voltage and frequency. The equation for power consumption of the MCU as it relates to supply voltage is shown in this slide. From the equation it can be seen that the power increases proportionally to the frequency and the square of the supply voltage. The plot shown is obtained by maintaining a constant frequency and varying the supply voltage. As the supply increases, the power consumption is increased by the square of the voltage. When a battery is fully charged, it is near the maximum supply voltage which would cause the system to consume higher power and drain the battery faster. The C8051F9xx family integrates both a low dropout regulator (LDO) and a DC/DC boost converter, both of which will be discussed on the following pages.