ATEVK527 Atmel, ATEVK527 Datasheet - Page 15

• Manufacturer Part Number: ATEVK527
• Description: KIT EVAL PWM AVR USB 4 SERIES
• Manufacturer: Atmel
• Series: AVR®r

Specifications of ATEVK527

• Main Purpose: Power Management, Battery Charger
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ATmega16U4, ATmega32U4
• Primary Attributes: 1 Cell- Li-Ion
• Secondary Attributes: Graphical User Interface, USB Interface
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.4.3 Charge()
7801A-AVR-06/08
Figure 4-4. Flow chart of battery control function
The charge function contains the charging algorithm divided into stages. For this
application, it has four stages:
ChargeParameters and HaltParameters are key variables of this function. The
program flow of this state function is illustrated in the figure below.
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•
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Prequalification - during which the battery is charged with a constant current
until a sufficient charge voltage is reached. If this happens within a given time
limit, the battery is considered good and the charger may continue on the
next stage. If time runs out before the voltage is reached, or battery
temperature goes out of limits, the battery is considered bad and charging is
halted.
Constant current charge - during which the battery is charged with a higher,
battery-specific current until the battery voltage reaches its maximum. If this
happens within the battery’s maximum charge time limit, the charger goes to
the next stage. If the time limit expires, or battery temperature goes out of
limits, the battery is considered bad and charging is halted.
Constant voltage charge – during which the battery is charged at the
maximum battery voltage until the charge current drops below a battery-
specific cut-off limit, or the maximum charge time limit expires. Here too,
charging is halted if battery temperature goes out of limits.
End charge – in which the charger decides whether to go into the sleep state,
or to attempt a charge of the other battery.
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