UG-1104
ADP5350CP-EVALZ User Guide
Rev. 0 | Page 10 of 15
EVALUATION BOARD MEASUREMENTS
CHARGE FUNCTION EVALUATION
Input Current Limit
The input current-limit function of the
ADP5350
can be evaluated
in charging mode. To measure the input current limit of the
VBUS node across the full programming range of 100 mA to
1500 mA, an additional system load must be connected to the
VSYS node.
1.
Set the supply voltage of the VBUS node on the
ADP5350CP-
EVALZ
to 5.0 V, populate a charged battery (V
BAT
> V
WEAK
),
or connect a battery simulator to the ISOB node.
2.
Use the
ILIM, Input current limit
and
ICHG, Fast charge
current
options in the
Charge Control
tab to program the
charge current higher than the input current-limit value
(see Figure 10).
3.
Measure the VBUS node input current and check whether
the
VBUS_ILIM
indicator is lit in the
Charger_Status1
section of the
Charge Control
tab (see Figure 10).
A 650 mA charge current into the battery may not be large
enough to drive the input current up to the limit when the
current limit is programmed to a value of 500 mA or higher.
Connect an additional load to the VSYS node to evaluate values
at the higher end of the programming range.
Fast Charge Current
To measure the fast charge current value,
1.
Set the supply voltage of the VBUS node on the
ADP5350CP-
EVALZ
to 5.0 V, populate a discharged battery (V
BAT
>
V
WEAK
), or connect a battery simulator to the ISOB node,
with its voltage set to 3.7 V.
2.
Use the
ILIM, Input current limit
option in the
Charge
Control
tab to program the input current limit to the
maximum value, 1500 mA.
3.
Check that the
THR Status
box shows
Thermistor OK
.
Otherwise, the variable resistor, R1, must be tuned until
THR Status
shows
Thermistor OK
. Alternatively, select
From I2C
in the
BAT_TEMP
box, and then program
BAT
TEMP
to 25°C in the
Battery SoC
tab (see Figure 11).
4.
The default value for the fast charge current is 500 mA. Set
the charge current with a range from 25 mA to 650 mA in
the
ICHG, Fast charge current
box in the
Charge Control
tab.
5.
Click
EN_CHG
under
Function Setting
in the
Charge
Control
tab to set the EN_CHG bit high, and then measure
the input charge current of the battery.
The fast charge current may be reduced due to one of the
following conditions:
x
The V
BSNS
level is close to the termination voltage, V
TRM
(default of 4.200 V) and the device is operating in constant
voltage mode.
x
The die temperature, T
J
, exceeds the isothermal charging
temperature, T
LIM
(typically 115°C).
x
The available current from the dc-to-dc converter output
of the
ADP5350
is limited by the maximum duty cycle (for
example, when the I
CHG
setting is 150 mA and V
ISOB
> 3.7 V).
x
The JEITA function is enabled, and the temperature is cool.
Termination Charge Voltage
It recommended to use a battery simulator to measure the
termination charge voltage.
1.
Set the supply voltage of the VBUS node on the
ADP5350CP-
EVALZ
to 5.0 V.
2.
Set the termination voltage to 4.2 V using the GUI.
3.
Sweep V
ISOB
up until the
Charger Status
box under the
Charger_Status1
section in the GUI shows
Fast Charge
(CV Mode)
and the charge current drops to lower than the
charge current setting (see Figure 11).
4.
Measure the termination voltage between the BSNS and
GND nodes.
FUEL GAUGE FUNCTION EVALUATION
The state of charge value that indicates the remaining battery
capacity is available by reading the I
2
C. In the
Battery SoC
tab,
the SOC value and the battery voltage are both shown when the
FUEL_GAUGE_ENABLE bit is enabled. Enabling sleep mode
for the fuel gauge places the
ADP5350
in very low power
consumption mode. Before enabling sleep mode, the battery SOC
and internal impedance characterization data must be entered
in the lower right portion of the
Battery SoC
tab. Click
Program SoC Curve
and
Program RBAT
to program the data
(see Figure 11).
LED AND LDO FUNCTION EVALUATION
LED Backlighting
To configure LED1 to LED3 in the backlight function, follow
these steps:
1.
Set the supply voltage of the VBUS node on the
ADP5350CP-
EVALZ
to 5.0 V, or connect a charged battery to the ISOB
node.
2.
Set the backlight current in
IBL_SET
from 0 mA to 20 mA
in the
LED&LDO Control
tab (see Figure 12).
3.
Set the BL_LED2 bit and the BL_LED3 bit high to group
LED2 and LED3 for the backlight function.
4.
Set the EN_BL bit high to enable the grouped backlight
function and turn on the LED backlight on the
ADP5350CP-EVALZ
evaluation board.
5.
Set
BL_FO Time
and
BL_FI Time
under the
Fade In/Out
and Blink Setting
section in the
LED&LDO Control
tab
to program the fade in and fade out feature for the
backlight.
6.
Set the EN_BL bit high and then low to evaluate the
backlight fade in and fade out function.
