dicodes DCM00011 Podręcznik - Strona 7

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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