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AN2390 データシート(PDF) 17 Page - STMicroelectronics |
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AN2390 データシート(HTML) 17 Page - STMicroelectronics |
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17 / 42 page  AN2390 Evaluation board implementation 17/42 2.3 MCU software 2.3.1 Architecture The software provided in this demo has state machine architecture. To explain more, various charging states can be defined for each slot. Each slot is driven by its state machine, with some interactions to implement front slot priority. In order to measure the charge time, a timekeeper is implemented and counters are incremented periodically. Most of the time, slot states are unchanged. This implies that the PWM duty cycle, charge enable signals and LED on/off states are constant. Periodically, the ST7 microcontroller measures the battery current, battery voltage and thermistor voltage of both slots. Using the measurements and the timekeeper values, it updates slot states and the output configuration. If necessary, it resets the timekeeper. |
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