AN4324 datasheet(29/31 Pages) STMICROELECTRONICS

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AN4324

Software

DocID024963 Rev 2.0

29/31

6.7

Power saving mode software management

The power saving mode of the STC3115 can be set dynamically during normal application

running. To maintain the best accuracy from the device, the driver should be called to use

power saving integrated functions (see Figure 19: "STC3115 power saving mode software

management"). Power saving management can be done in parallel with the normal

application workflow.

Figure 19: STC3115 power saving mode software management

The global behavior of the driver remains the same irrespective of the STC3115 power

mode: it reports the battery state information to the system after each scheduled task.

From the application software point of view, the STC3115 VMODE bit has to set to 1 to

enter power saving mode and has to be set to 0 to go back to normal mode. The VMODE

bit can be set to power saving mode or mixed mode according to the system mode as

shown in Figure 19: "STC3115 power saving mode software management".

Even if the STC3115 power saving mode is ON by default and used as the main mode for

reporting the battery state over the application life, the STC3115 mixed mode remains

more accurate. Mixed mode allows the user to get the best performance from the

STC3115. Mixed mode must not be set if no sense resistor is connected to the CG pin.

AN4324 Datasheet(PDF) 29 Page - STMicroelectronics