Datasheet

Applications information: charging process L6924D
22/38 Doc ID 11908 Rev 9
7.9 Termination modes
As shown in Figure 14, it is possible to set an end of charge current I
ENDTH
connecting a
resistor between the I
END
pin and GND. When the charge current goes down to this value,
after a de-glitch time, the status pins notify that the charge process is complete. This de-
glitch time is expressed as:
Equation 13
However, the termination of the charger process depends on the status of the V
PRE
pin:
● If the voltage at the V
PRE
pin is higher than 0.8 V, the charge process is actually
terminated when the charge current reaches I
ENDTH
.
● If the voltage at V
PRE
pin goes lower than 0.8 V, the charge process does not terminate,
and the charge current can go lower than I
ENDTH
. The status pins notify the end-of-
charge as a fault condition, but the device continues the charge. When the T
MAXCH
is
elapsed, the charge process ends, and a fault condition is issued.
● If the voltage on V
PRE
pin is lower than 0.8 V during the Pre-charge Phase, the device
sets the V
PRETHDefault
automatically.
● If the voltage at the V
PRE
pin goes lower than 0.5 V (edge sensitive), the timer is reset,
both in pre-charge and in fast-charge phase.
Figure 17. Charge termination flow chart
220
MAXCH
DEGLITCH
T
T =