Datasheet

L6924D Applications information: charging process
Doc ID 11908 Rev 9 19/38
7.5 End-of-charge current
When the charge voltage approaches the selected value (4.1 V or 4.2 V), the voltage
regulation phase takes place. The charge current starts to decrease until it goes lower than
a programmable end value, I
ENDTH
, depending on an external resistor connected between
the I
END
pin and GND (see Figure 14). The equation that describes this relation as follows:
Equation 10
Figure 14. I
END
pin connection
Where K
END
is 1050; and V
MIN
is 50 mV.
Typically, this current level is used to terminate the charge process. However, it is also
possible to disable the charge termination process based on this current level (Chapter 7.9
on page 22).
This pin is also used to monitor the charge current, because the current injected in R
END
is
proportional to I
CHG
. The voltage across R
END
can be used by a microcontroller to check the
charge status like a gas gauge.
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
×=
ENDTH
END
MINEND
I
K
VR