UG-1571
User Guide
Rev. 0 | Page 12 of 18
EVALUATION BOARD MEASUREMENTS
CHARGE FUNCTION EVALUATION
Input Current Limit
The input current-limit function of the
can be
evaluated in fast CC charging mode. An additional system load
must be connected to the VSYS node to measure the input
current limit of the VBUS node (see Figure 17) across the full
programming range of 50 mA to 500 mA. Adhere to the
following steps to evaluate the input current-limit function:
1.
Set the supply voltage of the VBUS node on the
ADP5360CB-EVALZ board to 5.0 V and then, either
populate a charged battery (V
BAT
> V
WEAK
) or connect a
battery simulator to the ISOB node (see Figure 17).
2.
Use the
ILIM, Input current limit
option and
ICHG, Fast
charge current
option in the
Charge Parameter Control
section to program the charge current higher than the
input current-limit value (see Figure 10).
3.
Measure the VBUS node input current by reading the input
supply current in the dc power supply and check whether the
VBUS_ILIM
indicator is lit in the
Charger_Status1
section
of the
Charge Control
tab (see Figure 10).
Connect an additional load to the VSYS node to evaluate values
at the higher end (more than 300 mA) of the programming range.
Fast Charge Current
To measure the fast charge current value, adhere to the
following steps:
1.
Set the supply voltage of the on-board VBUS node to 5.0 V,
populate a discharged battery (V
BAT
> V
WEAK
) and then
either connect a battery simulator to the ISOB node, with
the voltage set to 3.8 V.
2.
Use the
ILIM, Input current limit
option in the
Charge
Parameter Control
section under the
Charge Control
tab
to program the input current limit to the maximum value,
500 mA.
3.
Check that the
THR Status
box shows the
Thermistor OK
message in the
Charger_Status1
section of the
Charge
Control
tab. Otherwise, the variable resistor, R1, must be
tuned until the
THR Status
box shows
Thermistor OK
.
4.
The default value for the fast charge current is 100 mA. Set
the charge current with the range 10 mA to 320 mA in the
ICHG, Fast charge current
box in the
Charge Control
tab.
5.
Click the
EN_CHG
indicator under the
Charge
Function
Setting
section in the
Charge Control
tab to set the EN_CHG
bit high. Then measure the input charge current of the battery
by reading the battery simulator.
The fast charge current may be reduced due to one of the
following conditions:
The V
ISOB
(the voltage at the ISOB node) level is close to
the
VTRM, Termination Voltage
value in the
Charge
Parameter Control
box (see Figure 10). The default value
is 4.16 V. The device is operating in constant voltage mode
upon power-up.
The input voltage is lower than expected, 4.5 V or lower,
and close to the battery voltage.
The Japan Electronic Information Technology Association
(JEITA) function is enabled, which occurs when the
EN_JEITA bit is set high in the
Charge Control
tab, and the
temperature is cool. See the
data sheet for more
information.
Termination Charge Voltage
It recommended to use a battery simulator to measure the
termination charge voltage. Take the following steps to use the
battery simulator to measure the termination charge voltage:
1.
Set the supply voltage of the on-board VBUS node to 5.0 V.
2.
Set the termination voltage to 4.2 V in the
VTRM,
Terminal Voltage
box in the
Charge Parameter Control
section (see Figure 10).
3.
Increase the battery voltage in the battery simulator, until
the
Charger Status
box under the
Charger_Status1
section in the GUI shows
Fast Charge (CV Mode)
and the
charge current, measured in the battery simulator, drops
lower than the charge current setting (see Figure 10).
4.
Measure the termination voltage between the BSNS and
GND nodes by using the voltage meter.
FUEL GAUGE FUNCTION EVALUATION
In the
Fuel Gauge
Control
tab in Figure 11, the SoC value and
battery voltage are all shown when users enable the EN_FG bit.
The battery SoC value indicates the remaining battery capacity
and is found in the
Battery SoC %
gauge located in the
Fuel
Gauge Control
tab. Enabling sleep mode for the fuel gauge
places the
in very low power consumption mode.
Before enabling the fuel gauge function, the battery SoC vs. battery
voltage characterization data must be entered in the
SoC
and
VBAT
boxes located in the right side of the
Fuel Gauge Data
Log
tab (see Figure 14). Click the
Program SoC Curve
button
in the bottom right of the
Fuel Gauge Control
tab to program
the data (see Figure 11). The battery capacity can be filled in the
BAT_CAP
box located at the bottom left of the
Fuel Gauge
Control
tab.
Set the FG_MODE bit high (located under the
BAT_CAP
box
in Figure 11) by clicking the
FG_Mode
indicator to light it up
in the GUI. Setting this bit high allows the fuel gauge to run in
sleep mode, which achieves a low quiescent current. Set the
EN_BATCAP_TEMP and EN_BATCAP_AGE bits high (see
Figure 11) high by clicking the corresponding indicators to light
them up in the GUI. Setting these bits high enable the battery
capacity temperature and aging compensation feature.
