Direct Charging Sequence - Renesas DA9318 User Manual

UM-PM-022
DA9318 Direct Charging Reference Board
4.5

Direct Charging Sequence

A sequence diagram for direct charging is depicted in
NOTE
The DA9318 direct charging reference board communication to the TA is achieved using USB PD
communication protocol. The sequence diagram in
support@diasemi.com for more information.
TA Main Charger
nPG='0'
The main charger
starts charging
automatically
The TA ramps up
the voltage
nCE='1'
loop
nCE='0'
The main charger
handles the rest of the
charging cycle
User Manual
CFR0012
Figure 4
TA
DA9318
Control
Battery connected
Mini USB connected
TA connected
TA Control exchange power capabilities and
request to make a first contract. TA identity
checked and VDM communication initiated.
Set (VBUS)
Set (ILIM)
CP_EN='1'
Set (VBUS)
Set (ILIM)
CP_EN='0'
Figure 4: Sequence Diagram for Direct Charging
Revision 3.2
9 of 39
Figure 4.
is provided for information only. Please contact
Power
Monitor
Done
loop
loop
ic-
PC
Read VBAT
Read (VBAT)
Configure target VBUS
based on BATT
Write (TARG_VBUS)
Write (TARG_ILIM)
Read (VBUS)
If VBUS rises to the
target value, direct
charging is continued
Direct charging begins
Read (IIN)
Read (VBUS)
Read (VBAT)
As VBAT rises the output voltage of the
TA is increased. After the target VBAT
is hit the current limit of the TA is step-
wise reduced
Write (TARG_VBUS)
Write (TARG_ILIM)
Direct charging ends
16-Feb-2022
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