an1171

ISL6298EVAL1 Evaluation Board
Application Manual
®
Application Note
February 9, 2005
AN1171.0
Description
Features
The ISL6298EVAL1 provides a complete platform for the
evaluation of the ISL6298-2CR3. The on-board 9-bit DIP
switch facilitates programming charging current, setting EN
input, temperature monitoring status, and so on. The four
jumpers can set up input source selection, USB mode
selection, and can be used to make other necessary
connections.
• 9-bit DIP switch for conveniently setting up charging
current, battery thermal status, EN input, and so on
Assembled in the center square, the components constitute
a complete charger solution, demonstrating the space
saving advantage of the ISL6298 in limited space
applications.
LEDs connected to FAULT and STATUS pins will indicate
the normal charging status or fault condition.
On-board jumpers and a DIP switch accommodate different
operation conditions for the charger.
Ordering Information
PART NUMBER
ISL6298EVAL1
DESCRIPTION
Evaluation Board for ISL6298-2CR3
1
• Different jumpers for input source selection, USB mode
selection, and the convenience of current measurement
• Exposed soldering pads connected to STATUS, FAULT,
TIME, EN, V2P8 and TEMP functional pins to
accommodate experimental testing that need extra
connections to those pins
• Board size 3.5 x 2.5 square inches for the convenience of
evaluation
• Eight thermal vias in the thermal pad simulating the
customers’ thermally enhanced environment
Pinout
ISL6298 3X3 DFN
TOP VIEW
VIN
1
10 VBAT
FAULT
2
9
TEMP
STATUS
3
8
IREF
TIME
4
7
V2P8
GND
5
6
EN
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1171
What is inside
.
TABLE 1. DIP SWITCH PIN DESCRIPTIONS
Bit
The Evaluation Kit contains:
• ISL6298EVAL1 board
1
• The ISL6298 Data Sheet
Description
Adjustable
TIMEOUT
ON
OFF
5 hours
50 mins
3 hours
30 mins
Charger
charger
enable/disable disabled
charger
enabled
2
• This ISL6298EVAL1 Application Note
3
What is needed
4
The following instruments will be needed to perform testing:
5
• Power supplies:
1.PS1: DC 20V/5A,
6
2.PS2: DC (sinks current) 20V/5A, such as
Agilent 6654A
Remark
not connected
IREF setting 1 Add 125mA I
CHG=125mA
IREF setting 2 Add 250mA When both off
not connected
7
TEMP normal
normal
8
TEMP high
too hot
9
TEMP low
too cold
All off
simulates
battery
removal
• Electronic load: 20V/5A
TABLE 2. JUMPER SETTINGS
• Multimeters
JUMPER
• Function generator
• Oscilloscope
Step 1:
Switch on bit 4 and bit 7 of the Dip-switch. Leave
all other bits off, (See Figure 1.)
JP1
WALL CUBE TO
VIN
Wall adapter connection
JP2
Installed
Connect 5V on VIN.
Step 2:
Connect 3.7V on VBAT.
Step 3:
Connect 500mA electronic load on VBAT.
Step 4:
Verify that no shunts across all jumpers.
Step 5:
Turn on Power Supplies and electronic load.
Step 6:
Green LED should be on, indicating normal
charging operation.
Step 7:
If current meter is in series with VIN, it shall read
250mA as the charging current.
ON
OFF
2
3
4
5
6
7
8
9
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
JP3
installed
connect VBAT pin to battery current
meter can replace shunt
default
Battery attached to Thermistor at J2
IREF and V2P8
USB 255mA
IREF and GND
USB 100mA
Initial Board Jumper Positioning (Refer to Figure 3)
Step 1:
1
not installed
JP4
DO NOT APPLY POWER UNTIL STEP 6
FUNCTION
USB connection
• Cables and wires
Quick Setup Guide
POSITION
USB TO VIN
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
shunt is needed for JP3, as the Eval board can simulate
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
Application Note 1171
FIGURE 2. CONNECTION OF INSTRUMENTS
3
AN1171.0
February 9, 2005
Board Information
Schematics
4
Application Note 1171
AN1171.0
February 9, 2005
FIGURE 3. BOARD LAYOUT INFORMATION SCHEMATIC
Application Note 1171
TABLE 3. ISL6298EVAL1 BILL OF MATERIALS
ITEM
QTY
REFERENCE
PART DESCRIPTION
1
1
C1
1µF, 6.3V, X5R ceramic cap
0603
0603X105K6R3
Walsin
2
1
C2
10µF/6.3V, Tantalum Cap
2.05 x 1.3 x 1.2
TAJR106M006
AVX
3
1
C3
15nF/16V, X7R ceramic cap
0402
C1005X7R1C153K
TDK
4
1
C4
0.1µF/16V, Y5V ceramic cap
0402
C1005Y5V1C104ZT
TDK
5
1
C5
10nF/16V, X7R Ceramic cap
0805
C1005X7R1C103K
TDK
6
1
C6
10µF/16V, Tantalum Cap
3.2 x 1.6 x 1.6
TAJA106M016
AVX
7
1
D1
Green LED
0805
67-1553-1-ND
DigiKey
8
1
D2
Red LED
0805
67-1552-1-ND
DigiKey
9
2
R1, R2
1K, 5%
0603
Various
10
1
R3
10K, 1%
0603
Various
11
1
R4
160K, 1%
0603
Various
12
1
R6
160K, 1%
0805
Various
13
1
R7
80K, 1%
0805
Various
14
1
R9
5K, 1%
0805
Various
15
1
R10
500, 1%
0805
Various
16
1
R11
18K, 1%
0805
Various
17
1
J1
2.54mm Male Header, 2 ckt (R/A)
A23879-ND
DigiKey
18
1
J2
2.54mm Male Header, 3 ckt (R/A)
A23880-ND
DigiKey
19
2
JP1, JP4
2.54mm Male Header, 3ckt
WM6403-nd
DigiKey
20
2
JP2, JP3
2.54mm Male Header, 2 ckt
WM6402-nd
DigiKey
21
1
J3
USB receptacle, B type
787780-1-ND
DigiKey
22
1
SW1
DIP Switch, 9 Pos, SMT
CKN1323-ND
DigiKey
23
1
U1
ISL6298
Intersil
24
6
VIN, VBAT, TIME,
GND1, GND2, GND3
5002K-ND
DigiKey
Single-Cell Li-ion Battery Charger
Test Point
PCB FOOTPRINT
10-pin, 3X3 DFN
PART NUMBER
VENDOR
PCB Layout
SILK SCREEN LAYER
5
INTERNAL (LAYER 2, GND)
AN1171.0
February 9, 2005
Application Note 1171
PCB Layout
(Continued)
BOTTOM (LAYER 4, GND)
TOP (LAYER 1, SIGNAL)
INTERNAL (LAYER 3, FLOATING)
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to
verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
6
AN1171.0
February 9, 2005
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