UM-PM-022
DA9318 Direct Charging Reference Board
User Manual
Revision 1.0
1-Mar-2017
CFR0012
7
of
27
© 2017 Dialog Semiconductor
4.2
Power Monitor
Two power monitor ICs (INA226), fitted on the DA9318 direct charging reference board, allow for
measurement of the master charger input voltage and input current, and for monitoring the battery
current and voltage.
That information is read out via the I
2
C interface and used in the control GUI software running on the
PC.
When direct charging is enabled, the DA9318 internal ADC is monitoring the input/output current and
input/output voltage.
Power monitoring is a safety feature associated with direct charging. The input power of the mobile
device has to be compared to the output power of the TA. A mismatch indicates a fault condition and
the charging has to be terminated.
4.3
Direct Charging
Reverse current protection (RCP) is enabled whenever DA9318 is not in the ACTIVE mode.
DA9318 is capable of starting up when V
IN
is within the accepted range defined by V
IN2OUT_MIN
and
V
IN2OUT_MAX
. If V
IN
is not within the accepted range during start-up, the start-up is aborted.
When the above conditions are satisfied the DA9318 can be enabled by writing CP_EN to allow for
direct charging. The TA voltage is set accordingly to allow an initial 6 A charge current into the
battery.
During direct charging the master charger is disabled.
4.4
Over-Voltage Protection
Over-voltage protection (OVP) is needed for general protection of devices connected to VBUS.
can be used as they all are pinout
compatible parts with very similar feature sets.
