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 (VBAT > VWEAK),
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 (VBAT >
VWEAK), 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:
xThe VBSNS level is close to the termination voltage, VTRM
(default of 4.200 V) and the device is operating in constant
voltage mode.
xThe die temperature, TJ, exceeds the isothermal charging
temperature, TLIM (typically 115°C).
xThe available current from the dc-to-dc converter output
of the ADP5350 is limited by the maximum duty cycle (for
example, when the ICHG setting is 150 mA and VISOB > 3.7 V).
xThe 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 VISOB 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 I2C. 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.
