9.2.2 Detailed Design Procedure

When the main constraint is the battery life, the selection of a low power voltage reference, the µC, and the display is mandatory. The first step in the design is the calculation of the power consumption of the devices in their different mode of operations. For instance, the LMP91000 burns most of the power when in gas measurement mode, then, according to the connected gas sensor, it has two idle states (standby and deep sleep). The same is true for the µC, such as one of the MSP430 family, which can be placed in one of its lower power modes, such as LMP3.5 or LMP4.5. In this case, the TPL5010 can be used to implement the watchdog and wake-up timing functions.

After the power budget calculation, it is possible to select the appropriate time interval which satisfies the application constraints and maximize the life of the battery.