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STC3115AIQT View Datasheet(PDF) - STMicroelectronics

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STC3115AIQT Datasheet PDF : 34 Pages
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Functional description
STC3115
6.2
6.2.1
STC3115 gas gauge architecture
Coulomb counter
The Coulomb counter is used to track the SOC of the battery when the battery is charging or
discharging at a high rate. Each current conversion result is accumulated (Coulomb
counting) for the calculation of the relative SOC value based on the configuration register.
The system controller can control the Coulomb counter and set and read the SOC register
through the I2C control registers.
Figure 7. Coulomb counter block diagram
CG
GND
EOC
AD converter
16-bit counter
CC SOC
calculator
REG_COUNTER
register
REG_CURRENT
register
CC SOC
register (internal)
REG_CC_CNF
register
The REG_CC_CNF value depends on battery capacity and the current sense resistor. It
scales the charge integrated by the sigma delta converter into a percentage value of the
battery capacity. The default value is 395 (corresponding to a 10 msense resistor and
1957 mA.h battery capacity).
The Coulomb counter is inactive if the VMODE bit is set, this is the default state at power-
on-reset (POR) or reset (VMODE bit = 1).
Writing a value to the register REG_SOC (mixed mode SOC) forces the Coulomb counter
gas gauge algorithm to restart from this new SOC value.
REG_CC_CNF register is a 16-bit integer value and is calculated as shown in Equation 1:
Equation 1
REG_CC_CNF = Rsense × Cnom 49.556
Rsense is in mand Cnom is in mA.h
Example: Rsense =10 m, Cnom = 1650 mA.h, REG_CC_CNF = 333
14/34
DocID023755 Rev 7
 

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