an1172

ISL6298EVAL2 Evaluation Board
Application Manual
®
Application Note
February 9, 2005
AN1172.0
Description
Features:
The ISL6298EVAL2 provides a complete platform for the
evaluation of the ISL6298-2CR4. The on board 9-bit DIP
switch facilitates programming charging current, setting EN
input, battery thermal 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, 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.
• Board size 3.5 x 2.5 square inches for the convenience of
evaluation
• Eight thermal vias in the thermal pad simulating the
customers’ thermal enhanced environment
Pinout
Evaluation Board for the ISL6298-2CR4
VBAT
VBAT
VIN
VIN
DESCRIPTION
16 15 14 13
VIN 1
12 VBAT
FAULT 2
11 TEMP
10 IMIN
STATUS 3
9 IREF
1
5
6
7
8
TOEN
EN
V2P8
TIME 4
GND
ISL6298EVAL2
• Exposed soldering pads connected to STATUS, FAULT,
TIME, EN, V2P8, IMIN and TEMP functional pins to
accommodate experimental testing that need extra
connections to those pins
ISL6298 (16 LEAD QFN)
TOP VIEW
Ordering Information
PART #
• Different jumpers for input source selection, USB mode
selection, and the convenience of current measurement
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1172
What is inside
.
The Evaluation Kit contains:
TABLE 1. DIP SWITCH PIN DESCRIPTIONS
BIT
DESCRIPTION
ON
OFF
1
Adjustable
TIMEOUT
5 hours
50 mins
3 hours
30 mins
• This ISL6298EVAL2 Application Note
2
TIMEOUT
disable/enable
TIMEOUT
disabled
TIMEOUT
enabled
What is needed
3
Charger
enable/disable
Charger
disabled
Charger
enabled
The following instruments will be needed to perform testing:
4
IREF setting 1
5
IREF setting 2
Add 125mA ICHG=125mA
When both off
Add 250mA
• ISL6298EVAL2 board
• The ISL6298 Data Sheet
• Power supplies:
6
IMIN setting
25mA
1 PS1: DC 20V/5A,
7
TEMP normal
Normal
2 PS2: DC (sinks current) 20V/5A, such as
Agilent 6654A)
8
TEMP high
Too hot
9
TEMP low
Too cold
REMARK
12.5mA
All off
simulates
battery
removal
• Electronic load: 20V/5A
TABLE 2. JUMPER SETTINGS
• Multimeters
JUMPER
• Function generator
• Oscilloscope
JP1
• Cables and wires
JP2
Quick Setup Guide
Step 1:
Switch on bit 4 and bit 7 of the Dip-switch. Leave
all other bits off, (See Figure 1.)
Connect 5V on VIN.
Step 3:
Connect 3.7V on VBAT.
Step 4:
Connect 500mA electronic load on VBAT.
Step 5:
Verify that no shunts across all jumpers.
Step 6:
Turn on Power Supplies and electronic load.
Step 7:
Green LED should be on, indicating normal
charging operation.
Step 8:
If current meter is in series with VIN, it shall read
250mA as the charging current.
ON
OFF
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
FUNCTION
USB input selected
WALL CUBE TO Wall adapter input selected
VIN
Shunt Installed
Connect VBAT pin to battery
Current meter can replace shunt
shunt installed
Battery attached to Thermistor at J2
not installed
Default
IREF and V2P8 Setting USB 255mA mode
IREF and GND Setting USB 100mA mode
Initial Board Jumper Positioning (Refer to Figure 3)
Step 2:
2
JP3
JP4
DO NOT APPLY POWER UNTIL STEP 6
1
POSITION
USB TO VIN
JP1 - Selects the VIN pin to be connected to either a wall
adapter, or to a USB connector. If the J1 connector is being
used, a shunt must be installed across ‘WALL CUBE TO
VIN’, or if the J3 (USB) connector is being used, a shunt
must be installed across ‘USB TO VIN’. J1, J3 and JP1 can
be ignored if the power supply is connected directly to the
VIN test point, which is directly connected to the VIN pin of
the IC. A current meter, to measure the input current, can
replace the shunt mentioned above.
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 with
an attached thermistor is applied on J2 does it become
necessary to install a shunt across JP3, simultaneously
turning off bits 7, 8, and 9 on the DIP switch.
JP4 - Selects USB modes; a shunt across IREF and V2P8
will set USB 255mA 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.
AN1172.0
February 9, 2005
Application Note 1172
FIGURE 2. CONNECTION OF INSTRUMENTS
3
AN1172.0
February 9, 2005
Board Layout Information
Schematics of PCB board
4
Application Note 1172
AN1172.0
February 9, 2005
FIGURE 3. BOARD LAYOUT INFORMATION SCHEMATIC
Application Note 1172
TABLE 3. ISL6298EVAL2 BILL OF MATERIALS
ITEM
QUANTITY
REFERENCE
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 x1.6 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
2
R4, R5
160K, 1%
0603
Various
12
1
R6
160K, 1%
0805
Various
13
1
R7
80K, 1%
0805
Various
14
1
R8
160K, 1%
0805
Various
15
1
R9
5K, 1%
0805
Various
16
1
R10
500, 1%
0805
Various
17
1
R11
18K, 1%
0805
Various
18
1
J1
2.54mm Male Header, 2 ckt (R/A)
A23879-ND
DigiKey
19
1
J2
2.54mm Male Header, 3 ckt (R/A)
A23880-ND
DigiKey
20
2
JP1, JP4
2.54mm Male Header, 3ckt
WM6403-ND
DigiKey
21
2
JP2, JP3
2.54mm Male Header, 2 ckt
WM6402-ND
DigiKey
22
1
J3
USB receptacle, B type
787780-1-ND
DigiKey
23
1
SW1
DIP Switch, 9 Pos, SMT
CKN1323-ND
DigiKey
24
1
U1
ISL6298
Intersil
25
6
VIN, VBAT,
TIME, GND1,
GND2, GND3
5002K-ND
DigiKey
5
PART DESCRIPTION
Single-Cell Li-ion Battery Charger
Test Point
PCB FOOTPRINT
16-pin, 4 x 4 QFN
PART NUMBER
VENDOR
AN1172.0
February 9, 2005
Application Note 1172
PCB Layout
SILK SCREEN LAYER
INTERNAL (LAYER 2, GND)
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
AN1172.0
February 9, 2005
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