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19-1200; Rev 0a; 2/97
MAX1611 Evaluation Kit
________________General Description
The MAX1611 evaluation kit (EV kit) is an assembled
surface-mount demonstration board. The kit embodies
the standard cold-cathode fluorescent lamp application
circuit shown in Figure 4 of the MAX1610/MAX1611
data sheet. Additional circuitry allows an IBM-compati-
ble personal computer to use its parallel port to emulate
an Intel System Management Bus (SMBus™) interface.
The board comes with a MAX1611 installed, but with
minimal modification, the EV kit can also be used to
evaluate the MAX1610.
____________________________Features
o
Complete Surface-Mount Solution for Driving
CCFL Backlights
o
High Efficiency
o
PC-Compatible Software Emulates Intel SMBus
o
Fully Assembled and Tested
Evaluates: MAX1610/MAX1611
_______________Ordering Information
PART
MAX1611EVKIT-SO
TEMP. RANGE
0°C to +70°C
BOARD TYPE
Surface Mount
______________________________________________________________Component List
DESIGNATION QTY
C1
1
DESCRIPTION
0.1µF, low-dissipation capacitor
WIMA SMD7.3
18pF, 3.1kV, ceramic high-voltage
capacitor
Murata-Erie GHM1038-SL-180J-3K
0.027µF ceramic capacitors
0.1µF ceramic capacitors
Low-ESR, 10µF, 35V surface-mount
tantalum capacitor
AVX TPSD106M035R0300
Open
Diodes: Central Semiconductor
CMPD4448 (or CMPD2838)
1A, 30V Schottky diode
Motorola MBRS130LT3
6V, axial-leaded, type 1N5232B
zener diodes
Right-angle DB25 male connector
Open
100µH, 1.0A inductor
Coilcraft DO3316-104
NPN transistors
Zetex FMMT619
NPN transistors
Central Semiconductor CMPT3904
510Ω 5% resistor
,
Open
DESIGNATION QTY
R4
R5
R6
R7
R8, R9, R10,
R13, R14
R11
R12
R20, R21, R22
R24, R25, R26,
R30, R31, R32
R27, R28, R29
R33, R34, R35
SW1, SW2*
SW3
T1
U1
U1*
U2
None
None
1
1
1
1
0
1
1
3
6
3
3
2
1
1
1
1
1
1
1
DESCRIPTION
8.2kΩ 5% resistor
,
150kΩ 5% resistor
,
51kΩ 5% resistor
,
20Ω 5% resistor
,
Open
1Ω 5% resistor
,
1.2Ω 5% resistor
,
510kΩ 10% resistors
,
10kΩ 10% resistors
,
100kΩ 10% resistors
,
100Ω 10% resistors
,
Momentary pushbutton switches
(MAX1610)
Slide switch
CCFT transformer
Coiltronics CTX110605
MAX1611ESE CCFT controller with
SMBus interface
MAX1610ESE CCFT controller with
up/down interface
74HC14 hex Schmitt-trigger inverter
7" x 2.5" MAX1611 printed circuit board
Software disk:
MAX1611 DEMO DISK
C2
C3, C5
C4, C6,
C7, C8
C9
C20, C21
D1, D3, D20,
D21, D22
D2
D23, D24, D25
J1
JU1–JU4
L1
Q1, Q2
Q20, Q21, Q23
R2
R3
1
2
4
1
0
5
1
3
1
0
1
2
3
1
1
*Components
supplied but not mounted.
SMBus is a trademark of Intel Corp.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX1611 Evaluation Kit
Evaluates: MAX1610/MAX1611
Component Suppliers
SUPPLIER
AVX
Central
Semiconductor
Coilcraft
Coiltronics
Motorola
WIMA
Zetex USA
PHONE
(803) 946-0690
(516) 435-1110
(847) 639-6400
(561) 241-7876
(602) 303-5454
(914) 347-2474
(516) 543-7100
FAX
(803) 626-3123
(516) 435-1824
(847) 639-1469
(561) 241-9339
(602) 994-6430
(914) 347-7230
(516) 864-7630
4)
Connect the ground lead of your supply to the pad
marked GND. The CCFL should light up.
Be care-
ful not to touch either the transformer on the
MAX1611 EV kit or the stiff wire, as high volt-
ages are present.
Use a 28-pin, male/female parallel-port cable to
connect LPT1 on your IBM PC-compatible comput-
er to the MAX1611 EV kit.
Boot your IBM PC-compatible computer and exit
Windows to the MS-DOS prompt. Insert the disk
provided with the MAX1611 EV kit in drive A: and
type the following at the MS-DOS prompt:
5)
6)
a:
<ENTER>
Evaluating the MAX1611
1)
A cold-cathode fluorescent lamp (CCFL) has two
terminals. Usually the CCFL is built into an LCD
panel, and a plastic female connector extends from
the panel. The holes in the female connector are just
big enough to allow insertion of the leads from a
1/8W through-hole resistor. Cut off the resistor’s two
leads and use them as pieces of stiff wire. Solder
the wire into the two holes on the far-right side of the
EV kit. Bend the wire to form a suitable male con-
nector for attaching the plastic female connector
from the LCD panel. Push the female connector onto
the male connector (Figure 1).
Make sure the slide switch in the upper-left corner
of the MAX1611 EV kit (SW3) is pushed toward the
28-pin connector (down). Also make sure that
jumper JU1 is
not
installed.
Connect a +12V supply to the pad marked VIN on
the MAX1611 EV kit. Be careful not to accidentally
connect the +12V supply to the pads marked SDA,
SCL, or SMBSUS, or to the holes labeled JU3.
Before connecting the ground lead, double check
that the +12V connection is in the right place.
Make sure you see the prompt “A: \>”, then type :
maxsmb device max1611
Your screen will look like this:
<ENTER>
2)
3)
VIN
SDA
SW3
SCL
SMBSUS
GND JU1
C2
28 pin connector
MAX1611 EV KIT
STIFF WIRE
Figure 1. MAX1611 EV Kit Overview
2
_______________________________________________________________________________________
MAX1611 Evaluation Kit
Use the left and right arrows on your keyboard to
move the selected bit marker, “/-\”. Press the “0”
key or the “1” key to clear or set the selected bit.
Pressing “w” on your keyboard writes the bit pat-
tern to the MAX1611. Pressing “r” on your key-
board reads the status of the MAX1611.
7)
Press “r” on your keyboard. You should see the
question marks on the screen replaced with ones
and zeros, and the words “TUBE OK” should
appear. This indicates that the MAX1611’s status
was successfully read, and that it reported that the
CCFL is operating normally.
To set the CCFL brightness to full scale, set bits D41,
D31, D21, D11, and D10 to “1”, then press the “w”
key on your keyboard. The lamp will brighten and
the screen will look as follows:
Evaluating the MAX1610
Be sure to make all board modifications with power
disconnected.
1) Remove the MAX1611 from the EV board. Carefully
cut each of the MAX1611’s leads, then desolder
each lead individually so as not to damage the pads
on the board. Install the MAX1610 on the board in
the position previously occupied by the MAX1611.
2) Cut traces. On the back side of the MAX1611 EV kit,
near the 28-pin connector, are two small arrows that
point to two traces. Cut the two traces at the posi-
tions the arrows point to.
3) Install momentary switches SW1 and SW2.
4) A cold-cathode fluorescent lamp (CCFL) has two ter-
minals. Usually the CCFL is built into an LCD panel,
and a plastic female connector extends from the
panel. The holes in the female connector are just big
enough to allow insertion of the leads from a through-
hole resistor with a value of 1/8W. Cut off the resis-
tor’s two leads and use them as pieces of stiff wire.
Solder the wire into the two holes on the far right side
of the EV kit. Bend the stiff wire to form a suitable
male connector for attaching the plastic female con-
nector from the LCD panel. Push the female connec-
tor onto the male connector (Figure 1).
5) Make sure the slide switch in the upper-left corner of
the MAX1611 EV kit (SW3) is pushed toward the 28-
pin connector (down). Also make sure that jumper
JU1 is
not
installed.
6) Connect a +12V supply to the pad marked VIN on
the MAX1611 EV kit. Be careful not to accidentally
connect the +12V supply to the pads marked SDA,
SCL, or SMBSUS, or to the holes labeled JU3. Before
connecting the ground lead, double check that the
+12V connection is in the right place.
7) Connect the supply’s ground lead to the pad
marked GND. As soon as you do so, the CCFL will
light up.
Be careful not to touch either the trans-
former on the MAX1611 EV kit or the stiff wire, as
high voltages are present.
8) Since the MAX1610 does not have an SMBus inter-
face, do not connect the 28-pin male/female parallel
port cable. The CCFL intensity can be increased by
pressing then releasing switch SW2, or decreased
by pressing then releasing switch SW1. To place the
MAX1610 into shutdown mode, slide switch SW3
away from the 28-pin connector.
Evaluates: MAX1610/MAX1611
8)
9)
The SMBSUS line can be toggled via the key-
board. The MAX1611 has two fully configurable
modes. SMBSUS selects the active mode. SMB-
SUS = 1 activates the REGSEL = 1 mode, and
SMBSUS = 0 activates the REGSEL = 0 mode.
Pressing the “s” key toggles CCFL on and off. As
you press the “s” key, notice that the number to
the right of “S) SMBSUS:” toggles between zero
and one, indicating the current state of SMBSUS.
10) The MAX1611’s CCFL current-chopping mode can
be evaluated easily by installing jumper JU1. With
JU1 installed, the MAX1611’s MINDAC pin is short-
ed to the VL pin. To increase the VIN supply volt-
age beyond +12V, follow the component modifica-
tion instructions in the
Current-Chopping Mode
section of the MAX1610/MAX1611 data sheet
_______________________________________________________________________________________
3
Evaluates: MAX1610/MAX1611
MAX1611 Evaluation Kit
Figure 2. MAX1611 EV Kit Main Circuit Schematic
4
1
L
SCL
SCL
BATT
C9
10µF
35V
C6
0.1µF
SDA
SDA
VL
1
12
2
2 R
16
VIN
3
D3
CMPD4448
R7
20Ω
SMBSUS
C4
0.1µF
5
SS
LX
15
L1
100µH
2
D2
MBR513OLT3
R
C7
0.1µF
3
Q1
FMMT619
L
1
10
3
SMBSUS
BST
14
+5V
JU3
SHORT
U1
C3
27nF
MAX1611
6
CC
OTP
OPEN
R4
8.2k
4
SYNC
CS
11
C5
27nF
R 2
3
10
R3
L 1
1
C1
0.1µF 2
TUBE
R2
510Ω
3
4
5
6
T1
CTX110605
Q2
FMMT619
1 L
C2
18pF
3kV
JU1
OPEN
D1
CMPD4448
JU2
SHORT
9
REF
GND
C8
0.1µF
R5
150k
8
MINDAC
CSAV
7
JU4
SHORT
R10
R8
OPEN
OPEN
R6
51k
13
R9
OPEN
R11
1Ω
R12
1.2Ω
R13
OPEN
R14
OPEN
3
2 R
_______________________________________________________________________________________
+5V
U2F
12
74HC14
+5V
74HC14
13
6
5
U2C
U2A
2
74HC14
R35
SDA
J1-15
100Ω
3
10k
R28
100k 2 R
J1-4
L
3
10k
R29
100k 2 R
2N3904
+5V
U2B
4
74HC14
3
R24
10k
R22
510k
R32
2 R
CMPD4448
2N3904
1
1 L
D22
SMBSUS
Q23
3
R21
510k
R31
1 L
3
Q21
C21
OPEN
74HC14
74HC14
SW3
D25
6V ZENER
8
9 10
11
U2D
U2E
R26
10k
1
R25
10k
R34
100Ω
SW2
SW-MOM
OPEN
J1-11
D24
6V ZENER
D21
Figure 3. MAX1611 EV Kit Interface Logic Schematic
R33
100Ω
SW1
SW-MOM
OPEN
SCL
Q20
1 L
3
R20
510k
R27
100k 2 R
2N3904
J1-18
J1-19
J1-20
J1-21
C20
OPEN
J1-22
J1-23
J1-24
J1-25
J1-5
J1-13
3
10k
R30
J1-3
1
L
2 R
CMPD4448
J1-12
D23
6V ZENER
D20
J1-2
1
L
2 R
Evaluates: MAX1610/MAX1611
_______________________________________________________________________________________
CMPD4448
MAX1611 Evaluation Kit
5

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