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4.
dicodes charger cs1: Operation (3)
As already stated, the charger can detect the current strength of the source
according to the USB battery charging specification BC 1.2.
This specification defines how an USB powered charger should identify the
source using the USD data-lines D+ and D-.
This specification was created to avoid undefined loading of wall adapters
from different vendors.
Possible USB sources are a PC or dedicated USB charging sources with current
cpabilities of 1A/2A or even 3A.
When the micro USB port on the charger station is used, the charger initiates
a source strength detection cycle. When successful, the source strength is
displayed on the LC-Display.
When the source connected to the micro-USB cannot be identified, the input
current is limited to 500mA.
Moreover the charger always monitors the input voltage and - in case the
source is overloaded adjusts the charge current such that the input voltage
doesn't fall below 4.8V.
In any case an overloading of the source is avoided.
The charging profile has three steps, when the battery seen is discharged to
a voltage below 2.8V:
1. Precharging: The charge current is limited to 260mA until the battery
voltage has increased to 3V.
2. After precharging the full charging current is applied to the battery until
the battery voltage has reached about 4.0V
3. Above 4V, the current is successively reduced until the battery voltage is
at 4.15V.
The charging profile is optimzed to avoid stressing the battery and thus
enable a high number of charging life cycles.
Source Detection
Charging Cycle