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UM-PM-022
DA9318 Direct Charging Reference Board
4
Functional Description
During direct charging the main charger of the battery operated device is bypassed and the Dialog
TA is directly connected to the battery.
The difference between normal charging and direct charging is illustrated in
In order for the direct charging to work, the TA has to have a configurable output voltage and current
limit. Currently the Dialog's 33 W TA can support output voltages of between 3.3 V and 11 V in 25
mV steps, and current limits up to 3 A in 50 mA steps.
VBUS
VBUS
Figure 3: Normal Charging (Top) and Direct Charging (Bottom)
4.1
Main Charger
The main charger is capable of handling a complete charging cycle without host interaction.
The input current limit is set via GPIOs and the charging current and dynamic power management
thresholds are set with external pull-down resistors.
User Manual
CFR0012
IN
DA9318
'0'
nCPEN
IN
SW
SYS
Main Charger
BAT
'1'
nCE
IN
DA9318
'1'
nCPEN
IN
SW
SYS
Main Charger
BAT
'0'
nCE
Revision 3.2
6 of 39
Figure
3.
OUT
SYS
+
-
OUT
SYS
+
-
© 2022 Renesas Electronics
16-Feb-2022
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