AN4324 datasheet(7/31 Pages) STMICROELECTRONICS

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AN4324

Battery parameters

DocID024963 Rev 2.0

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Battery parameters

This section describes how to calculate the parameters of the application.

To operate properly, the STC3115 uses typical values of the battery to track the state of

charge (SOC) in the application at a given time.

The parameters can be calculated using the formulae below. This parameter set is

commonly called the "battery model". This model is an image of battery behavior against

the STC3115 principle. The parameters and their calculation are also described in the

STC3115 datasheet.

•

REG_CC_CNF: (Rsense x Nominal battery capacity) / 49.556

•

REG_VM_CNF: (Internal battery impedance x Nominal battery capacity) / 977.78

•

REG_ALARM_SOC has to be set according to the application needs

(e.g. 10 % as a typical value)

•

REG_ALARM_VOLTAGE has to be set according to the application needs

(e.g. 3600 mV as a typical value)

•

REG_CURRENT_THRES: (Battery capacity / 10), up to 200 mA

AN4324 Datasheet(PDF) 7 Page - STMicroelectronics