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AN2390 датащи(PDF) 17 Page - STMicroelectronics

номер детали AN2390
подробное описание детали  A flexible universal battery charger
PDF  42 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2390 датащи(HTML) 17 Page - STMicroelectronics

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AN2390
Evaluation board implementation
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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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