Charge Cycles Examples - Renesas DA9318 User Manual

UM-PM-022
DA9318 Direct Charging Reference Board
NOTE
The target charge current can be increased or decreased by setting the new target in the Target Battery
Current field prior to enabling the Auto Charge.
When the Auto Charge is set the settings cannot be changed on the fly. All changes made to any settings will
be ignored until a new charge is initiated.
7.3.2.3

Charge Cycles Examples

Example #1: 3.7 V 11560 mAH/43 Wh Tablet Battery
Figure 34 shows the automatic charge cycle of a 3.7 V 11560 mAH/43 Wh tablet battery.
Figure 34: Automatic Charge Cycle – Profile Plot – 11560 mAh Battery
The test conditions are shown here below:
•
Main CC = 2.048 A
•
Main CV = 4.208 V
•
Target Battery Current = 5.000 A
•
VBat Main to Direct Charger handover thresholds (volts) = 3.3 V
•
IBat Direct to Main Charger handover threshold (amps) = 1.1 A
•
Battery step down current step (mA) = 100 mA
•
Direct Charger VBat Warning Threshold (volts) = 4.157589286 V
NOTE
In Auto Mode the Target Battery Current for the 11560 mAh battery can be set to 5.500 A maximum.
Initially the main charger is in pre-charge (128 mA by default) until the battery voltage reaches 3 V
(default threshold set in the main charger's registers).
Then, the main charger enters fast charge with a fast charge current arbitrarily set to 1.024 A.
Once the handover battery voltage threshold is reached to enter direct charging; the main charger is
disabled and the DA9318 is enabled with a target battery charge current of 5.5 A.
Upon assertion of the E_VBAT_WARN event, the TA current is reduced allowing for a smaller
charge current; then the E_VBAT_WARN event is reset.
Every time the E_VBAT_WARN event is flagged up the TA steps down its current limit setting
accordingly by yet another current step.
User Manual
CFR0012
Revision 3.2
33 of 39
16-Feb-2022
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