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STC3105IQT データシート(PDF) 11 Page - STMicroelectronics |
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STC3105IQT データシート(HTML) 11 Page - STMicroelectronics |
11 / 23 page STC3105 Functional description Doc ID 022198 Rev 1 11/23 6.4 Coulomb counter The coulomb counter is used to track the state-of-charge of the battery when the battery is charging or discharging at a high rate. Each result of current conversion is accumulated into a 28-bit accumulator. The upper 16 bits of the accumulator are added to the SOC base register to provide the current state-of-charge (SOC) in the charge register. The system controller can control the coulomb counter, set the SOC base register value and read the charge register through the I2C control registers. Figure 4. Coulomb counter block diagram When using an external 30 m Ω sense resistor, the 28-bit accumulator results in a coulomb counter capacity of approximately +/- 7300 mA.h. The upper 16 bits used for the charge register give a resolution of 0.2 mA.h. 6.5 Alarm output The ALM pin provides an alarm signal in case of low battery condition. The output is an open drain, and an external pull-up resistor may be needed in the application. Writing the IO0DATA bit to 0 forces the ALM output low; writing the IO0DATA bit to 1 lets the ALM output reflect the battery condition. Reading the IO0DATA bit gives the state of the ALM pin. |
同様の部品番号 - STC3105IQT |
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同様の説明 - STC3105IQT |
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