Dialog DA9318, Руководство пользователя

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UM-PM-022
DA9318 Direct Charging Reference Board
User Manual Revision 1.0 1-Mar-2017
CFR0012
6 of 27
© 2017 Dialog Semiconductor
4 Functional Description
During direct charging the master charger of the battery operated device is bypassed and the TA is
directly connected to the battery.
The difference between normal charging and direct charging is illustrated in Figure 3 .
In order for the direct charging to work, the TA has to have a configurable output voltage and current
limit.
DA9318
Master Charger
SYS
SW
BAT
IN
IN OUT
nCPEN
nCE
+
-
SYS VBUS
'0'
’1'
DA9318
Master Charger
SYS
SW
BAT
IN
IN OUT
nCPEN
nCE
+
-
SYS VBUS
'1'
’0'
Figure 3: Normal Charging (Top) and Direct Charging (Bottom)
4.1 Master Charger
The master 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.
The charging statuses are communicated via LEDs. The master charger can be enabled with the
nCE signal driven from the microcontroller. During direct charging the master charger is disabled.