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Application Note 1171
What is inside
.
TABLE 1. DIP SWITCH PIN DESCRIPTIONS
The Evaluation Kit contains:
? ISL6298EVAL1 board
Bit
1
Description
Adjustable
TIMEOUT
ON
5 hours
50 mins
OFF
3 hours
30 mins
Remark
? The ISL6298 Data Sheet
2
not connected
? This ISL6298EVAL1 Application Note
Charger
charger
charger
What is needed
The following instruments will be needed to perform testing:
? Power supplies:
3
4
5
6
enable/disable disabled enabled
IREF setting 1 Add 125mA I CHG =125mA
IREF setting 2 Add 250mA When both off
not connected
1.PS1: DC 20V/5A,
2.PS2: DC (sinks current) 20V/5A, such as
Agilent 6654A
7
8
9
TEMP normal
TEMP high
TEMP low
normal
too hot
too cold
All off
simulates
battery
removal
? Electronic load: 20V/5A
? Multimeters
TABLE 2. JUMPER SETTINGS
? Function generator
? Oscilloscope
? Cables and wires
Quick Setup Guide
JUMPER
JP1
JP2
POSITION
USB TO VIN
WALL CUBE TO
VIN
Installed
FUNCTION
USB connection
Wall adapter connection
connect VBAT pin to battery current
meter can replace shunt
Step 1:
Switch on bit 4 and bit 7 of the Dip-switch. Leave
not installed
default
all other bits off, (See Figure 1.)
DO NOT APPLY POWER UNTIL STEP 6
JP3
JP4
installed
IREF and V2P8
IREF and GND
Battery attached to Thermistor at J2
USB 255mA
USB 100mA
Step 1:
Step 2:
Step 3:
Step 4:
Step 5:
Step 6:
Step 7:
Connect 5V on VIN.
Connect 3.7V on VBAT.
Connect 500mA electronic load on VBAT.
Verify that no shunts across all jumpers.
Turn on Power Supplies and electronic load.
Green LED should be on, indicating normal
charging operation.
If current meter is in series with VIN, it shall read
250mA as the charging current.
ON
OFF
Initial Board Jumper Positioning (Refer to Figure 3)
JP1 - Selects the VIN pin to be connected to either wall
adapter, or to USB connector. If J1 connector is being used,
a shunt must be installed across ‘WALL CUBE TO VIN’, or if
J3 (USB) connector is being used a shunt must be installed
across ‘USB TO VIN’. J1, J3 and JP1 can be ignored if
power supply is connected directly to VIN test point, which is
directly connected to VIN pin of the IC. A current meter can
replace the shunt mentioned above, so as to measure the
input current.
JP2 - Can connect the VBAT pin to the battery. If the J2
connector is being used, a shunt must be installed across
JP2. In this case, a current meter can also replace the shunt
to measure the VBAT current.
JP3 - Can connect the TEMP pin to the battery. Usually no
1
2
3
4
5
6
7
8
9
shunt is needed for JP3, as the Eval board can simulate
FIGURE 1. INITIAL DIP SWITCH SETTINGS
DIP Switch Settings
A 9-bit DIP switch is provided to set up voltage, current
reference, end-of-charge (EOC) current, and so on. The
functionality of the bits are described in Table 1.
2
various battery thermal conditions. Only when a battery
attached with a thermistor is applied on J2 does it become
necessary to install a shunt across JP3, and at the same
time bit 7, 8, 9 on the DIP switch all need to be turned off.
JP4 - Selects USB modes: a shunt across IREF and V2P8
will set USB 250mA mode, a shunt across IREF and GND
will set USB 100mA mode. When the charge current is
programmed by the resistors connected to IREF pin, no
shunt should be installed on JP4.
AN1171.0
February 9, 2005
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