UG-500
Evaluation Board User Guide
Rev. 0 | Page 8 of 15
Figure 6. Board Setup for VINx Quiescent Current Measurement
VINx Current Limit
The VINx current limit of the
ADP5062
can be evaluated in
charging mode. Note that the maximum programming for the
charge current into the battery (ISO_Bx) is 1300 mA. For
measuring the input current limit across the full programming
range from 100 mA to 2100 mA, additional system load has to
be connected to the ISO_Sx pins.
To measure the VINx current limit, do the following:
1.
Set the V
VIN
supply voltage to 5.0 V.
2.
Set the V
ISO_B
voltage to 3.6 V on SMU B
3.
Enable charging by setting Register 0x07, bit D0
(EN_CHG), high
4.
Confirm the ADP5062 charging mode:
The
Battery Status
indicator on the GUI must show
BAT_SNS > Vweak
(see Figure 2).
The
ADP5062
must start charging 80 mA to 90 mA
current into the battery.
5.
Measure the current on VINx supply.
6.
Use the GUI to change the input current limit programming
and repeat the measurement.
A 1300 mA charge current into the battery may not be large
enough to drive the input current up to the limit when the
current limit programming values of 1200 mA or higher are used.
Connect an additional load on the ISO_Sx node to evaluate the
higher end of the input current limit programming range.
TRICKLE CHARGE CURRENT
Trickle charge can only be activated during a battery charging
startup sequence, if the voltage level at the ISO_Bx pins is lower
than the V
TRK_DEAD
threshold (typically 2.5 V). When V
VIN
is 5.0
V, initiate a charge startup sequence by setting an I
2
C write of
Register 0x07, Bit D0 (EN_CHG), high. To measure the trickle
charge current level, do the following:
1.
Set the V
ISO_B
voltage (SMU or battery simulator) to 2 V.
2.
Set the V
IN
supply voltage to 5.0 V.
3.
Check that the GUI
Charger Status
indicator shows
Trickle Charge
.
4.
Check that the GUI
Battery Status
indicator shows
BAT_SNS < Vtrk
.
5.
Check the battery short detection by doing the following:
Wait for a 30 second timeout to expire
Check that the GUI shows that the I
2
C fault register
(Register 0x0D, Bit D3) BAT_SHR flag is set.
Use the GUI to change the battery short timeout
setting from 1 second to 180 second.
6.
Measure the trickle charge current level to the battery. The
default value for I
TRK_DEAD
is 20 mA. It is possible to change
the trickle charge current setting from 5 mA to 80 mA
using the GUI.
7.
Adjust the V
ISO_B
voltage up until the
Battery Status
indicator
shows
Vtrk < BAT_SNS < Vweak
.
8.
The
Charger Status
indicator on the GUI should show
Fast
Charge (CC-Mode)
. The charge current is now programmed
I
CHG
+ I
TRK_DEAD
, if it is not limited by the input current limit.
