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General DescriptionThe MAX6974 evaluation kit (EV kit) is an assembled andtested printed circuit board (PCB) that demonstrates theMAX6974/ MAX6975 precision current-sinking, 24-outputPWM LED drivers. The MAX6974/MAX6975 functionalitycan be evaluated using the MAX6974 EV kit. TheMAX6975 has 14-bit individual PWM and 5-bit globalPWM, while the MAX6974 has 12-bit individual PWM and7-bit global PWM. The evaluation kit comes with aMAX6974ATL+ installed. The Windows® 98/2000/XPsoftware supports only the MAX6974.
Features♦ Proven PCB Layout
♦ Complete Evaluation System
♦ Convenient On-Board Test Points
♦ Fully Assembled and Tested
♦ Multiplexed 4 x 8 RGB (96 LEDs Total) 20mA LEDMatrix
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MAX6974 Evaluation Kit
________________________________________________________________ Maxim Integrated Products 1
19-0519; Rev 1; 2/07
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Ordering InformationPART TYPE INTERFACE REQUIREMENTS
MAX6974EVKIT+ EV kit Windows PC with RS-232 serial port
DESIGNATION QTY DESCRIPTION
C1 1100µF ± 20%, 10V X 5R cap aci tor ( 1812) TD K C 4532X 5R1A107M
C2, C3 2100µF ±20%, 6.3V X 5R cap acitor s ( 1210) TD K C 3225X 5R0J107M
C4, C5, C25 310µF ± 10% , 6.3V X 5R cap aci tor s ( 0603) TD K C 1608X 5R0J106K
C6–C9 40.47µF ± 10%, 6.3V X5R cap aci tors ( 0402)TD K C 1005X 5R0J474K
C10–C16 70.1µF ± 10%, 6.3V X 5R cap aci tor s ( 0402) TD K C 1005X 5R0J104K
C17, C18 20.001µF ±10%, 25V X5R capacitors (0402)TD K C 1005X5R1E 102K
C19–C22 4120p F ± 5% , 25V C 0G cap aci tor s ( 0402) TD K C 1005C 0G1E 121J
C23, C24 210p F ± 5%, 25V C 0G cap aci tor s ( 0402) TD K C 1005C 0G1E 100J
C26 10.01µF ± 10%, 6.3V X 5R cap aci tor ( 0402) TD K C 1005X 5R1E 103K
D1–D32 32RGB LED modulesStanley URGB1308B-10-TF
J1 0 Not installed
J2 1 2 x 5 right-angle receptacle (0.1in)
J3 1 2 x 5 right-angle male header (0.1in)
J4 0 Not installed
Windows is a registered trademark of Microsoft Corp.
Component ListDESIGNATION QTY DESCRIPTION
JU1–JU13 13 2-pin headers
JU14–JU20 7 3-pin headers
P1 1 Female DB9 connector
Q1–Q4 4pnp transistorsZetex FMMTL717TA (SOT23)
R1–R8 8 200Ω ±1% resistors (0603)
R9–R12 4 182Ω ±1% resistors (0603)
R13–R16 4 562Ω ±1% resistors (0603)
R17 1 4.99kΩ ±1% resistor (0402)
R18 1 9.53kΩ ±1% resistor (0402)
R19 1 249kΩ ±1% resistor (0402)
R20 1 267kΩ ±1% resistor (0402)
TP1–TP10 0 Not installed
U1, U2 224-output LED driversMaxim MAX6974ATL+(40-pin TQFN, 6mm x 6mm EP)
U3 1Low-power microcontrollerMaxim MAXQ2000-RAX+(68-pin QFN, 10mm x 10mm EP)
U4 1Dual LVDS line driverMaxim MAX9112EKA+ (8-pin SOT23)
U5 1Dual LVDS line receiverMaxim MAX9113EKA+ (8-pin SOT23)
+Denotes a lead-free and RoHS-compliant EV kit.
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Quick StartRequired Equipment
Before you begin, you need the following equipment:
• Maxim MAX6974EVKIT
• DC power supply, 5VDC at 1A
• Windows 98/2000/XP-compatible computer with aserial (COM) port
• 9-pin I/O extension cable
ProcedureDo not turn on the power until all connectionsare complete.
1) Ensure that all jumpers JU1–JU20 are in 1-2 posi-tion (see Table 5).
2) Connect a 5VDC power source (7VDC maximum) tothe board at the VLED and GND terminals.
3) Connect a cable from the computer’s serial port tothe EV kit. If using a 9-pin serial port, use a straight-through, 9-pin female-to-male cable. If the onlyavailable serial port uses a 25-pin connector, astandard 25-pin-to-9-pin adapter is required.
4) Install the evaluation software on your computer bylaunching MAX6974.msi. (The latest software canbe found on Maxim’s website www.maxim-ic.com.)The program files are copied and icons are createdfor them in the Windows Start menu.
5) Turn on the power supply. None of the LEDs lightup at this time.
6) Start the MAX6974 program by opening its icon inthe Start menu.
7) In the Select Maxim MAX6974 Evaluation KitSoftware Mode window, select Connect to EVKit onport (Autodetect). Click OK. See Figure 1. Verify thatthe blue M test pattern appears (test_0_blue_M.clr).
8) From the File menu, select Load Test Patterns...and then pick the file test_01_all_white.clr. Verifythat all 32 RGB LEDs light up in white.
9) In the LED0 color grid, double-click one of thelarge round color dots in the 4 x 8 grid (or selectone of the dots and click OK). The standard colorselector dialog box appears. Select a color andclick OK. Click Upload All to write the 4 x 8 colorgrid data to the board. Verify that the LEDs light upin colors corresponding to the software color gridsettings.
10) Set Global Intensity to 5/63 and click Upload All.Verify that the LEDs are brighter.
Detailed Description of SoftwareThe MAX6974 EV kit software controls one or moreMAX6974 EV kit boards, each of which has twoMAX6974s driving a 4 x 8 grid of LEDs.
MAX6974 Evaluation Kit
2 _______________________________________________________________________________________
DESIGNATION QTY DESCRIPTION
U6 1RS - 232 tr anscei ver M axi m M AX 3311E U B+ ( 10- p i n µM AX ® )
U7, U8 2LDO linear regulatorsMaxim MAX1658ESA+ (8-pin SO)
U9 1LDO linear regulatorMaxim MAX1659ESA+ (8-pin SO)
Component List (continued)DESIGNATION QTY DESCRIPTION
Y1 120MHz crystalCitizen HCM49-20.000MABJ-UT
Y2 132MHz oscillatorECS ECS-3953M-320-B-TR
— 1 PCB: MAX6974 evaluation kit+
— 20 Shunts
Component Suppliers
SUPPLIER PHONE FAX WEBSITE
TDK Corp. 847-803-6100 847-390-4405 www.component.tdk.com
Zetex USA 631-543-7100 631-864-7630 www.zetex.com
Note: Indicate that you are using the MAX6974 when contacting these component suppliers.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Universal OptionsThe Cascaded Boards control must be set to the num-ber of boards that are connected.
When Multiplexing is disabled, only the left half of the4 x 8 grid is driven. See the Detailed Description ofHardware section.
Clicking the Upload Control Command Only buttonwrites the control command to all cascaded MAX6974s(see Figure 2). Refer to the MAX6974/MAX6975 datasheet Commands section, Table 15.
Individual Board OptionsThe Individual Board Options controls apply to thetwo MAX6974s on the selected board. If using a singleEV kit board, leave Select Board set at 1. See theCascading Boards section.
The Board Calibration controls determine the peakLED current for each group of output ports. Becausethe LEDs used on the EV kit board are only rated for20mA, setting the calibration controls to a value greaterthan about 50/255 can exceed the LED’s rated drivecurrent, causing permanent damage to the LED.
The 4 x 8 grid of circles inside Board LED Colors cor-responds to the 4 x 8 grid of LEDs on the EV kit board.These can be individually selected by clicking themwith the mouse. The Change… button chooses thecolor of the single selected LED. Clicking the ChangeAll button sets all 32 LEDs to a chosen color.
Upload AllClicking the Upload All button writes universal andindividual board options to all cascaded MAX6974s.
File-Load Test PatternsPressing the key combination Ctrl+T brings up a con-venient window containing a list of test pattern files (see Figure 3). All files whose names begin with “test_” and end with “.clr” are listed as test patterns. Click on a filename from the list, and the chroma pattern is immediately loaded. For example, test pattern test_921_ 2boards_all_white.clr loads a master and oneslave board with a 4 x 16 pattern where all of the LEDsare on. The test pattern default.clr is loaded at startup.
Disabling LED MultiplexingAs shipped from the factory, the 4 x 8 grid of tricolor LEDsis multiplexed. To disable multiplexing, and drive only theleft 4 x 4 half of the grid, two steps are necessary. First,jumpers JU1–JU6 and JU19 and JU20 must be reconfig-ured. See Table 5. Second, the Multiplexing must be setto Disabled in Universal Options.
Cascading BoardsTwo or more MAX6974 EV kit boards can be connectedtogether in a master-slave configuration, using the mas-ter/slave connectors, J2 and J3.
1) With power off, connect the J3 pins of one board tothe J2 socket of the next board.
2) The board on the left is the master. On the masterboard, set the JU14–JU18 shunts to position 1-2.On all other boards, set the JU14–JU18 shunts toposition 2-3.
3) The board on the right is the last slave. On the lastslave board, set the JU10–JU13 shunts closed. Onall other boards, remove the JU10–JU13 shunts.
4) Connect 5VDC power to the master board, betweenthe VLED and GND pads.
5) Connect a cable from the computer’s serial port tothe master board. If using a 9-pin serial port, use astraight-through, 9-pin, female-to-male cable.
6) Install the evaluation software on your computer bylaunching MAX6974.msi. The program files arecopied and icons are created for them in theWindows Start menu.
7) Turn on the power supply. None of the LEDs lightup at this time.
8) Start the MAX6974 program by opening its icon inthe Windows Start menu.
9) In the Select Maxim MAX6974 Evaluation KitSoftware Mode window, select Connect to EVKiton port (Autodetect). See Figure 1. Click OK.
10) Set the software’s Cascaded Boards to 2, 3, 4, or5, depending on the number of boards used.
11) Set the software’s Select Board to 1 to work withthe master board.
12) In the Board 1 LED Colors grid, double-click oneof the large round color dots in the 4 x 8 grid (orselect one of the dots and click OK). The standardcolor selector dialog box appears. Select a colorand click OK.
13) Click Upload All to write the 4 x 8 color grid data tothe board. Verify that the LEDs light up in colorscorresponding to the software color grid settings.
14) Set Board 1 Global Intensity to 5/63 and clickUpload All. Verify that the LEDs are brighter.
15) Set the software’s Select Board to 2 to work withthe next board, and repeat the process of settingLED colors, global intensity, and upload all.
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MAX6974 Evaluation Kit
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4 Slideshow DemoThe EV kit software can load a sequence of test pat-terns. From the Command menu, select Slideshow,then choose a folder containing test pattern files (seeFigure 4). The time between patterns can be adjustedbetween 50ms and 30s.
Detailed Description of HardwareThe MAX6974 precision current-sinking, 24-output PWMLED drivers (U1, U2) drive a 4 x 8 multiplexed grid ofred-green-blue LEDs in the common-anode configura-tion. Common-emitter pnp BJTs (Q1–Q4) switch theLED supply voltage in the multiplexing configuration.See Tables 1 and 2.
User-supplied DC power between 5V and 7V, appliedbetween the VLED and GND pads, is regulated by threeMAX1658/MAX1659 low-dropout linear regulators (U7,U8, and U9) to produce 5V, 3.3V, and 2.5V supply rails.
The MAXQ2000 microcontroller (U3) drives theMAX9112 LVDS level shifter (U4). When JU14–JU18 arein the 1-2 position, this microcontroller drives the
MAX6974 LED display drivers (U1, U2). A 32MHz crys-tal oscillator (Y2) is used to demonstrate optimum PWMfrequency by driving the LVDS clock signal betweencommand sequences. During command sequences,the MAXQ2000 bit bangs the LVDS clock at 2.8MHz.
When used with the software, the MAX3311 (U6) trans-lates the RS-232 signal levels from the COM port (P1) tologic-level signals. Resistor-dividers R17/R18 convertthe 5V logic output into 3.3V logic.
When JU14–JU18 are in the 2-3 position, external LVDSsignals must be applied to connector J2. In this slaveconfiguration, the MAXQ2000 (U3), MAX9112 (U4), andMAX3311 (U6) are not used.
LED Power DissipationPeak LED current is set by each port’s LED current cali-bration register. This 8-bit DAC allows peak LED cur-rent to be reduced to between 20% and 100% of thefull-scale rating, 30mA. Setting the current calibrationregister to a value of 0 limits the peak LED current to6mA (20% of 30mA). By writing different values to thered, green, and blue ports’ current calibration registers,the display’s color balance can be adjusted to compen-sate for LED efficacy variations.
The evaluation kit is shipped from the factory with anLED type (Stanley URGB1308B) that has a maximum rat-ing of 20mA forward current or 84mW power dissipation.
Evaluating the MAX6975The MAX6974 EV kit’s software and firmware are onlycapable of driving 12-bit PWM values. If the EV kit wereused to drive the MAX6975s instead, then the two leastsignificant bits of the individual pixel PWM values arenot accessible. See Tables 3 and 4.
MAX6974 Evaluation Kit
4 _______________________________________________________________________________________
Table 1. LED Nonmultiplexing
IC/PORT LED DEVICES DRIVEN COLORS
U1 port R D1 to D8 Red
U1 port G D1 to D8 Green
U2 port R D9 to D16 Red
U2 port G D9 to D16 Green
U1 port B D1 to D8 Blue
U2 port B D9 to D16 Blue
Table 2. LED Multiplexing
IC/PORT LED DEVICES DRIVEN COLORS
D1 to D8U1 port R
D17 to D24Red
D1 to D8U1 port G
D17 to D24Green
D9 to D16U2 port R
D25 to D32Red
D9 to D16U2 port G
D25 to D32Green
D1 to D8U1 port B
D9 to D16Blue
D17 to D24U2 port B
D25 to D32Blue
Table 3. Device Comparison—Nonmultiplexed Operation
M A X6 9 7 4 M A X6 9 7 5 O PER A T I O N
7 b i ts 5 b i ts G l ob al - i ntensi ty contr ol P W M r esol uti on
3 ( R, G , B) 3 ( R, G , B) N um b er of LE D cur r ent cal i b r ati onr eg i ster s
8 b i ts 8 b i ts LE D cur r ent cal i b r ati on r esol uti on
30m A 30m AM axi m um LE D d r i ve cur r ent( LE D cur r ent cal i b r ati on = 255)
6m A 6m ALE D d r i ve cur r ent( LE D cur r ent cal i b r ati on = 0)
24 24 N um b er of p i xel s
12 b i ts 14 b i tsInd i vi d ual p i xel P W M - i ntensi ty- contr ol r esol uti on
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Table 4. Device Comparison—Multiplexed OperationM A X6 9 7 4 M A X6 9 7 5 O PER A T I O N
6 b i ts 4 b i ts G l ob al - i ntensi ty contr ol P W M r esol uti on
3 ( R, G , B) 3 ( R, G , B) N um b er of LE D cur r ent cal i b r ati onr eg i ster s
8 b i ts 8 b i ts LE D cur r ent cal i b r ati on r esol uti on
30m A 30m AM axi m um LE D d r i ve cur r ent( LE D cur r ent cal i b r ati on = 255)
6m A 6m ALE D d r i ve cur r ent( LE D cur r ent cal i b r ati on = 0)
48 48 N um b er of p i xel s
12 b i ts 14 b i tsInd i vi d ual p i xel P W M - i ntensi ty- contr ol r esol uti on
Table 5. Jumper Functions Table
JUMPER PINS FUNCTION
Closed* Enables LED multiplexing.JU1
Open Disables LED multiplexing.
Closed* Enables LED multiplexing.JU2
Open Disables LED multiplexing.
Closed* Enables LED multiplexing.JU3
Open Disables LED multiplexing.
Closed* Enables LED multiplexing.JU4
Open Disables LED multiplexing.
Closed* Enables LED multiplexing.JU5
Open Disables LED multiplexing.
Closed* Enables LED multiplexing.JU6
Open Disables LED multiplexing.
Closed* Normal operation.JU7
Open Force LED D1 red open fault condition.
Closed* Normal operation.JU8
Open Force LED D1 green open fault condition.
Closed* Normal operation.JU9
Open Force LED D1 blue open fault condition.
*Default jumper setting.
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MAX6974 Evaluation Kit
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Table 5. Jumper Functions Table (continued)
JUMPER PINS FUNCTION
Closed* Single board mode: R9 terminates CLKO; nothing connects to J3.JU10
Open No CLKO termination, allowing slave board to connect to J3.
Closed* Single board mode: R9 terminates CLKO; nothing connects to J3.JU11
Open No CLKO termination, allowing slave board to connect to J3.
Closed* Single board mode: R10 terminates DOUT; nothing connects to J3.JU12
Open No DOUT termination, allowing slave board to connect to J3.
Closed* Single board mode: R10 terminates DOUT; nothing connects to J3.JU13
Open No DOUT termination, allowing slave board to connect to J3.
1-2* Master mode; nothing connects to J2.
2-3 Slave mode; driven by another MAX6974 EV kit connected to J2.JU14
Open Not valid. Do not use.
1-2* Master mode; nothing connects to J2.
2-3 Slave mode; driven by another MAX6974 EV kit connected to J2.JU15
Open Not valid. Do not use.
1-2* Master mode; nothing connects to J2.
2-3 Slave mode; driven by another MAX6974 EV kit connected to J2.JU16
Open Not valid. Do not use.
1-2* Master mode; nothing connects to J2.
2-3 Slave mode; driven by another MAX6974 EV kit connected to J2.JU17
Open Not valid. Do not use.
1-2* Master mode; nothing connects to J2.
2-3 Slave mode; driven by another MAX6974 EV kit connected to J2.JU18
Open Not valid. Do not use.
1-2* Enables LED multiplexing.
2-3 Disables LED multiplexing.JU19
Open Not valid. Do not use.
1-2* Enables LED multiplexing.
2-3 Disables LED multiplexing.JU20
Open Not valid. Do not use.
*Default jumper setting.
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Figure 1. Select Maxim MAX6974 EV Kit Software ModeScreenshot
Figure 2. MAX6974 EV Kit—Connected to COM1 Main WindowScreenshot
Figure 3. Click to Upload Color Test Pattern Screenshot
Figure 4. Slideshow Screenshot
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MAX6974 Evaluation Kit
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Figure 5a. MAX6974 EV Kit Schematic (Sheet 1 of 5)
2VL
ED
IN INOU
T
1SE
T7 6
5
IN3
48 OUT
MAX
1658
U7SH
DN +3.3
V
C2 100μ
F
+3.3
V
GND
VLED
2VL
ED
IN INOU
T
1SE
T7 6
5
IN3
48 OUT
MAX
1659
U9SH
DN +5V
C25
10μF
+5V
GND
VLED
VLED
2
IN INOU
T
1SE
T7 6
5
IN3
48 OUT
MAX
1658
U8SH
DN +2.5
V
C3 100μ
F
GND
VLED
+2.5
V
R20
267k
Ω1% R1
924
9kΩ
1%
VLED
C1 100μ
F
VLED
5.5
5V
GND
*PIN
31
OF M
AX69
74 S
HOUL
D BE
ROU
TED
TO G
ROUN
D SE
PARA
TELY
.
MAX
6974
U1
EXPO
SED
PADD
LE T
O GN
D
LOAD
O25
B7_A
32
B7
B3_A
36
B3
B4_A
35
B4
B6_A
33
B6
B5_A
34
B5
B2_A
37
B2
B1_A
38
B1
B0_A
39
B0
R4_A
12
R4
G3_A
19
G3
G2_A
G4_A
20
G4
18
G2
G1_A
17
G1
G0_A
16
G0
R7_A
15
R7
R6_A
14
R6
R5_A
R3_A
11
R3
13
R5
*31 GN
D
CLKO
+29
CLKO
-28
R5 200Ω
1%
DOUT
+27
DOUT
-26
R6 200Ω
1%
V DD
24
+3.3
V
C6 0.47
μF
GND
7
CLKI
+2
CLKI
+
1M
UX0_
A
DIN+
4DI
N+
3CL
KI-
CLKI
-
LOAD
I6
LOAD
I
5DI
N-DI
N-
R210
R2_A
9R1
R1_A
8R0
R0_A
30M
UX1
MUX
0M
UX1_
A
22G6
G6_A
21G5
G5_A
23G7
G7_A
+3.3
V
40 V DD
C7 0.47
μFC4
10μF
MAX
6974
U2
EXPO
SED
PADD
LE T
O GN
D
LOAD
O25
B7_B
32
B7
B3_B
36
B3
B4_B
35
B4
B6_B
33
B6
B5_B
34
B5
B2_B
37
B2
B1_B
38
B1
B0_B
39
B0
R4_B
12
R4
G3_B
19
G3
G2_B
G4_B
20
G4
18
G2
G1_B
17
G1
G0_B
16
G0
R7_B
15
R7
R6_B
14
R6
R5_B
R3_B
11
R3
13
R5
*31 GN
D
CLKO
+29
CLKO
-28
DOUT
+27
DOUT
-26
V DD
24
+3.3
V
C8 0.47
μF
GND
7
CLKI
+21
MUX
0_B
DIN+
43CL
KI-
LOAD
I65
DIN-
R210
R2_B
9R1
R1_B
8R0
R0_B
30M
UX1
MUX
0M
UX1_
B
22G6
G6_B
21G5
G5_B
23G7
G7_B
+3.3
V
40 V DD
C9 0.47
μFC5
10μF
CLKO
-
TP7
DOUT
+
TP8
CLKO
+
TP6
DOUT
-
TP9
LOAD
O
TP10
CLKO
-
DOUT
+
DOUT
-
CLKO
+43
OUT1
1 GND
MAX
9113
U5
OUT2
DOUT
CLKO
2V CC
+3.3
V
C17
0.00
1μF
C10
0.1μ
F
JU12
JU13
IN2-
5IN
2+6
R8 200Ω
1%
J3-5
J3-6
J3-8
J3-7
J3-3
J3-1
J3
J3-4
J3-2
J3-1
0J3
-9
VLED
VLED
LOAD
ON.
C.
JU11
JU10
IN1-
8
IN1+
7
R7 200Ω
1%
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Figure 5b. MAX6974 EV Kit Schematic (Sheet 2 of 5)
SEG1
11
SEG1
22
SEG1
33
SEG1
44
SEG1
55
SEG1
66
SEG1
77
SEG1
88
SEG1
99
SEG2
010
SEG2
111
SEG2
212
SEG2
313
SEG2
414
SEG2
515
SEG2
616
SEG2
717
T048
T0B
47
V DD
49
HFXI
N51
T246
T2B
45
T144
T1B
43
GND
42
MIS
O41
SCLK
40
MOS
I39
32KO
UT3538
TX1
37
RX1
36
OSC_
EN
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
VADJ
VLCD2
VLCD1
VLCD
RXO
1920
2122
2324
2526
2930
3132
33
6867
6665
6463
6261
6059
5857
5655
5453
TXO
52
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
COM0
2728
VDDIO
GND
TCK
34
32KIN
TDI
TMS
TDO
50HF
XOUT
Y1
C23
10pF
C24
10pF
SS
RESET
C12
0.1μ
F
+2.5
V
U3
MAX
Q200
0
EXPO
SED
PADD
LE U
NCON
NECT
ED
SEG28
18
+3.3
V
C13
0.1μ
F
J1-7
J1-8
J1-2
J1-9
J1-5
J1-3
J1
J1-6
J1-4
J1-1
0J1
-1
+3.3
V
N.C.
N.C.
TXO
RXO
CLKO
DOUT
LOAD
O
+5V
41V C
C C1-
C1+
MAX
3311
U6
TIN
TXO
5RO
UTRX
O
3
29
C15
0.1μ
F
C14
0.1μ
F
RIN
6
TOUT
7
GND
10SH
DN
R17
4.99
kΩ1%
R18
9.53
kΩ 1%
V-8
C16
0.1μ
F
P1-3
P1-8
P1-4
P1-2
P1-1
P1
P1-7
P1-6
N.C.
P1-9
N.C.
N.C.
N.C.
N.C.
P1-5
N.C.
J2-6
J2-5
J2-7
J2-9
J2-8
J2-4
J2-2
J2
J2-3
J2-1
J2-1
0
VLED
VLED
31DI
N1
4 GND
MAX
9112
U4
DIN2
2V CC
C11
0.1μ
FC1
80.
001μ
F
DO2-
5DO
2+6
R4 200Ω
1%
DO1-
8
DO1+
7
R3 200Ω
1%2
3
1TR
I
GND
OUT
OSC_
ENVC
C4
+3.3
V+3
.3V
C26
0.01
μFY2
12
3
JU15 1
2
3
JU17 1
2
3
JU18
DIN-
12
3
JU16
CLKI
+
12
3
JU14
LOAD
I
R1 200Ω
1%
CLKI
-
CLKI
+
TP1
TP3
TP2
R2 200Ω
1%
DIN+
TP4
TP5
N.C.
DIN-
Eva
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tes:
MA
X6
97
4
MAX6974 Evaluation Kit
10 ______________________________________________________________________________________
Figure 5c. MAX6974 EV Kit Schematic (Sheet 3 of 5)
D19-
A
PR2_
APV
MUX
1_A
D19-
B
PG2_
APV
MUX
1_A
D19-
C
PB2_
APV
MUX
1_A
D20-
A
PR3_
APV
MUX
1_A
D20-
B
PG3_
APV
MUX
1_A
D20-
C
PB3_
APV
MUX
1_A
D21-
A
PR4_
APV
MUX
1_A
D21-
B
PG4_
APV
MUX
1_A
D21-
C
PB4_
APV
MUX
1_A
D22-
A
PR5_
APV
MUX
1_A
D22-
B
PG5_
APV
MUX
1_A
D22-
C
PB5_
APV
MUX
1_A
D23-
A
PR6_
APV
MUX
1_A
D23-
B
PG6_
APV
MUX
1_A
D23-
C
PB6_
APV
MUX
1_A
D24-
A
PR7_
APV
MUX
1_A
D24-
B
PG7_
APV
MUX
1_A
D24-
C
PB7_
APV
MUX
1_A
D25-
A
PR0_
BPV
MUX
1_B
D25-
B
PG0_
BPV
MUX
1_B
D25-
C
PB0_
BPV
MUX
1_B
D26-
A
PR1_
BPV
MUX
1_B
D26-
B
PG1_
BPV
MUX
1_B
D26-
C
PB1_
BPV
MUX
1_B
D27-
A
PR2_
BPV
MUX
1_B
D27-
B
PG2_
BPV
MUX
1_B
D27-
C
PB2_
BPV
MUX
1_B
D13-
A
PR4_
BPV
MUX
0_B
D13-
B
PG4_
BPV
MUX
0_B
D13-
C
PB4_
BPV
MUX
0_B
D14-
A
PR5_
BPV
MUX
0_B
D14-
B
PG5_
BPV
MUX
0_B
D14-
C
PB5_
BPV
MUX
0_B
D15-
A
PR6_
BPV
MUX
0_B
D15-
B
PG6_
BPV
MUX
0_B
D15-
C
PB6_
BPV
MUX
0_B
D16-
A
PR7_
BPV
MUX
0_B
D16-
B
PG7_
BPV
MUX
0_B
D16-
C
PB7_
BPV
MUX
0_B
D17-
A
PR0_
APV
MUX
1_A
D17-
B
PG0_
APV
MUX
1_A
D17-
C
PB0_
APV
MUX
1_A
D18-
A
PR1_
APV
MUX
1_A
D18-
B
PG1_
APV
MUX
1_A
D18-
C
PB1_
APV
MUX
1_A
D7-A
PR6_
APV
MUX
0_A
D7-B
PG6_
BPV
MUX
0_A
D7-C
PB6_
APV
MUX
0_A
D8-A
PR7_
APV
MUX
0_A
D8-B
PG7_
APV
MUX
0_A
D8-C
PB7_
APV
MUX
0_A
D9-A
PR0_
BPV
MUX
0_B
D9-B
PG0_
BPV
MUX
0_B
D9-C
PB0_
BPV
MUX
0_B
D10-
A
PR1_
BPV
MUX
0_B
D10-
B
PG1_
BPV
MUX
0_B
D10-
C
PB1_
BPV
MUX
0_B
D11-
A
PR2_
BPV
MUX
0_B
D11-
B
PG2_
BPV
MUX
0_B
D11-
C
PB2_
BPV
MUX
0_B
D12-
A
PR3_
BPV
MUX
0_B
D12-
B
PG3_
BPV
MUX
0_B
D12-
C
PB3_
BPV
MUX
0_B
D2-A
PR1_
APV
MUX
0_A
D2-B
PG1_
APV
MUX
0_A
D2-C
PB1_
APV
MUX
0_A
D3-A
PR2_
APV
MUX
0_A
D3-B
PG2_
APV
MUX
0_A
D3-C
PB2_
APV
MUX
0_A
D4-A
PR3_
APV
MUX
0_A
D4-B
PG3_
APV
MUX
0_A
D4-C
PB3_
APV
MUX
0_A
D5-A
PR4_
APV
MUX
0_A
D5-B
PG4_
APV
MUX
0_A
D5-C
PB4_
APV
MUX
0_A
D6-A
PR5_
APV
MUX
0_A
D6-B
PG5_
APV
MUX
0_A
D6-C
PB5_
APV
MUX
0_A
D1-A
PR0_
AJU
7PV
MUX
0_A
D1-C
PB0_
AJU
9PV
MUX
0_A
D1-B
PG0_
AJU
8PV
MUX
0_A
Eva
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MAX6974 Evaluation Kit
______________________________________________________________________________________ 11
Figure 5d. MAX6974 EV Kit Schematic (Sheet 4 of 5)
D28-
A
PR3_
BPV
MUX
1_B
D28-
B
PG3_
BPV
MUX
1_B
D28-
C
PB3_
BPV
MUX
1_B
D29-
A
PR4_
BPV
MUX
1_B
D29-
B
PG4_
BPV
MUX
1_B
D29-
C
PB4_
BPV
MUX
1_B
D30-
A
PR5_
BPV
MUX
1_B
D30-
B
PG5_
BPV
MUX
1_B
D30-
C
PB5_
BPV
MUX
1_B
D31-
A
PR6_
BPV
MUX
1_B
D31-
B
PG6_
BPV
MUX
1_B
D31-
C
PB6_
BPV
MUX
1_B
D32-
A
PR7_
BPV
MUX
1_B
D32-
B
PG7_
BPV
MUX
1_B
D32-
C
PB7_
BPV
MUX
1_B
12
3
JU19
R918
2Ω 1%
23
1Q1
VMUX
O_A
JU1
R13
562Ω
1%
MUX
O_A
C19
120p
F
12
3
JU20
R10
182Ω 1%
23
1Q2
VMUX
O_B
JU2
R14
562Ω
1%
MUX
O_B
C20
120p
F
JU5
R11
182Ω 1%
23
1Q3
VMUX
1_A
JU3
R15
562Ω
1%
MUX
1_A
C21
120p
F
JU6
R12
182Ω 1%
23
1Q4
VMUX
1_B
JU4
R16
562Ω
1%
MUX
1_B
C22
120p
F
VLED
Eva
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MA
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MAX6974 Evaluation Kit
12 ______________________________________________________________________________________
Figure 5e. MAX6974 EV Kit Schematic (Sheet 5 of 5)
J4-1
1
J4-1
3
J4-9
J4-7
J4
J4-8
J4-1
6
J4-1
4
J4-1
2
J4-1
0
J4-1
5
J4-5
J4-6
J4-3
J4-1
J4-4
J4-2
J4-2
7
J4-2
9
J4-2
5
J4-2
3
J4-3
2
J4-1
8
J4-2
0
J4-2
2
J4-2
4
J4-2
6
J4-2
8
J4-3
0
J4-3
1R7
_A
R4_A
R3_A
R5_A
R6_A
PR3_
A
PR4_
A
PR5_
A
PR6_
A
J4-2
1
J4-1
9
J4-1
7
R1_A
R0_A
R2_A
PRO_
A
PR1_
A
PR2_
A
PR7_
A
J4-4
3
J4-4
5
J4-4
1
J4-3
9
J4-4
8
J4-3
4
J4-3
6
J4-3
8
J4-4
0
J4-4
2
J4-4
4
J4-4
6
J4-4
7G7
_A
G4_A
G3_A
G5_A
G6_A
PG3_
A
PG4_
A
PG5_
A
PG6_
A
J4-3
7
J4-3
5
J4-3
3
G1_A
G0_A
G2_A
PGO_
A
PG1_
A
PG2_
A
PG7_
A
(ODD
PIN
S CO
NNEC
T TO
EVE
N PI
NS O
N TO
P OF
PCB
)
VMUX
0_A
VMUX
0_B
VMUX
1_A
VMUX
1_B
PVM
UX0_
A
PVM
UX0_
B
PVM
UX1_
A
PVM
UX1_
B
J4
J4-5
9
J4-6
1
J4-5
7
J4-5
5
J4-6
4
J4-5
0
J4-5
2
J4-5
4
J4-5
6
J4-5
8
J4-6
0
J4-6
2
J4-6
3B7
_A
B4_A
B3_A
B5_A
B6_A
PB3_
A
PB4_
A
PB5_
A
PB6_
A
J4-5
3
J4-5
1
J4-4
9
B1_A
B0_A
B2_A
PBO_
A
PB1_
A
PB2_
A
PB7_
A
J4-7
5
J4-7
7
J4-7
3
J4-7
1
J4-8
0
J4-6
6
J4-6
8
J4-7
0
J4-7
2
J4-7
4
J4-7
6
J4-7
8
J4-7
9R7
_B
R4_B
R3_B
R5_B
R6_B
PR3_
B
PR4_
B
PR5_
B
PR6_
B
J4-6
9
J4-6
7
J4-6
5
R1_B
R0_B
R2_B
PRO_
B
PR1_
B
PR2_
B
PR7_
B
(ODD
PIN
S CO
NNEC
T TO
EVE
N PI
NS O
N TO
P OF
PCB
)
J4
J4-9
1
J4-9
3
J4-8
9
J4-8
7
J4-9
6
J4-8
2
J4-8
4
J4-8
6
J4-8
8
J4-9
0
J4-9
2
J4-9
4
J4-9
5G7
_B
G4_B
G3_B
G5_B
G6_B
PG3_
B
PG4_
B
PG5_
B
PG6_
B
J4-8
5
J4-8
3
J4-8
1
G1_B
G0_B
G2_B
PGO_
B
PG1_
B
PG2_
B
PG7_
B
J4-1
07
J4-1
09
J4-1
05
J4-1
03
J4-1
12
J4-9
8
J4-1
00
J4-1
02
J4-1
04
J4-1
06
J4-1
08
J4-1
10
J4-1
11B7
_B
B4_B
B3_B
B5_B
B6_B
PB3_
B
PB4_
B
PB5_
B
PB6_
B
J4-1
01
J4-9
9
J4-9
7
B1_B
B0_B
B2_B
PBO_
B
PB1_
B
PB2_
B
PB7_
B
(ODD
PIN
S CO
NNEC
T TO
EVE
N PI
NS O
N TO
P OF
PCB
)
Eva
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MAX6974 Evaluation Kit
______________________________________________________________________________________ 13
Figure 6. MAX6974 EV Kit Component Placement Guide—Component Side
Eva
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MAX6974 Evaluation Kit
14 ______________________________________________________________________________________
Figure 7. MAX6974 EV Kit PCB Layout—Component Side
Eva
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MAX6974 Evaluation Kit
______________________________________________________________________________________ 15
Figure 8. MAX6974 EV Kit PCB Layout—Ground Layer 2
Eva
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MAX6974 Evaluation Kit
16 ______________________________________________________________________________________
Figure 9. MAX6974 EV Kit PCB Layout—Signal Layer 3
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses areimplied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17
© 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Eva
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AX
69
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MAX6974 Evaluation Kit
Figure 10. MAX6974 EV Kit PCB Layout—Solder Side
Springer
Revision HistoryPages changed at Rev 1: 1, 2, 8–12, 14–17