AN4324 datasheet(23/31 Pages) STMICROELECTRONICS

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AN4324

Software

DocID024963 Rev 2.0

23/31

From this point, the battery model characteristics and application threshold are

initialized and battery tracking can start. To define the battery starting point, write back

the OCV value into the REG_OCV register (16 bits) using the variable content. From

this operation, the first battery SOC is available in the REG_SOC register 100 ms

later. At this point, the provided SOC is based on the fine-tuned OCV curve defined in

Table 3 plus the initial OCV curve described in Table 2.

STC3115 restoration steps

In this case, some registers can be initialized with the recorded RAM data using the

improved battery model from the last running period. Other registers have to be initialized

with default values.

Read the RAM memory. In this case, the last recorded state-of-charge (SOC) reflects

the initial battery SOC. Read it and save it as a temporary variable.

Set the STC3115 parameters (ensuring first that the GG_RUN bit is set to 0). The

REG_OCVTAB registers have to be filled with their previously calculated values. The

REG_CC_CNF and REG_VM_CNF registers have to be initialized using RAM

information that can be different and more accurate regarding battery aging. Then,

configure

the

application

parameters

setting

the

REG_ALARM_SOC,

REG_ALARM_VOLTAGE,

REG_CURRENT_THRES,

REG_RELAX_MAX,

REG_ALARM_SOC, and REG_ALARM_VOLTAGE registers as required by the

application to provide an HW interruption signal on the ALM pin when one of the

measurements

detected

being

below

the

defined

threshold.

The

REG_CURRENT_THRES and REG_RELAX_MAX registers are used to configure the

internal behavior of the STC3115. Default values are enough to provide good

accuracy.

Write the REG_SOC register. From this point, the battery model characteristics and

application threshold are initialized and battery tracking can start. To define the battery

starting point, write back the SOC value (read previously in the RAM) into the

REG_SOC register (16 bits). From this operation, the first battery SOC is available in

the REG_SOC register without delay. To start battery monitoring, set the GG_RUN bit,

as well as the VMODE bit if the power saving mode is selected (refer to Section 6.3).

Figure 16 summarizes the initialization steps and Figure 17 summarizes the initialization

and restoration flowcharts.

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