ISL9241EVAL1Z
3. Functional Description
UG184 Rev.3.00
Page 10 of 28
Aug.26.19
3. Add an electrical load on VSYS and GND terminals J
3
and J
4
. Turn on the load and increase the electrical load
slowly; the input current increases correspondingly and VSYS keeps stable at 8.38V. The output voltage
(VSYS) starts dropping as the input current reaches the 0.476A input current limit. For the input current limit
details, see the
datasheet. If the VSYS voltage is 150mV lower than the battery voltage, the BGATE
FET turns on at a low voltage level so that the battery supplies the current to the load.
3.4
Configuring the ISL9142EVAL1Z for Charging Mode
1. Set the power supply to a constant value between 3.8V and 24V, then complete Steps 1 and 2 in
. Make sure the input current does not exceed the limit.
2. Set the battery emulator voltage to 7.8V and connect the battery emulator output to battery leads J
5
and J
6
.
3. Connect the USB cable at the USB port for the SMBus. LED1, 2, and 3 all turn on.
4. Turn on the power supply; LED3 goes out. Turn on the battery emulator and open the Renesas ISL9241 GUI
(
Note:
A green check mark in the
USB Interface
status indicates the GUI is ready to communicate with the
ISL9241EVAL1Z. If the
USB Interface
shows a red X, the GUI is not ready to communicate with the
ISL9241EVAL1Z. Click the
Reset USB
button until a green check mark appears in the
USB Interface
. If the
green check mark does not appear, check the USB connection. See
“Troubleshooting the GUI” on page 7
troubleshooting information.
5. Select
2 Cell
in the
No of Battery Cell
section and click the
Write All
button. All controller register values are
set to the default values correspondingly. The system voltage is 8.4V, which is the value of
MaxSysVoltage
in
the GUI. There is no charge and discharge current for the battery. Set the minimum system voltage
(
MinSysVoltage
) to a non zero value. Change the charge current limit (
ChargeCurrentLimit
) from
0A
to
2A
and click
Write
. The battery is now in 2A current charge operation. The charge current value can be monitored
in the GUI by clicking
Read
in the
ChargeCurrentLimit
column. Monitor the BGATE signal status to confirm
the battery is in Charging mode.
6. To turn on charging (trickle and fast/normal), set the
MinSysVoltage
register and the
ChargeCurrentLimit
register to non-zero values.
Figure 8. ISL9241 GUI