MAX7349EVKIT [MAXIM]
Proven PC Board Layout;
| 型号： | MAX7349EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Proven PC Board Layout PC |
| 文件： | 总14页 (文件大小：691K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3994; Rev 0; 2/06
MAX7349 Evaluation Kit
General Description
Features
♦ Proven PC Board Layout
The MAX7349 evaluation kit (EV kit) is an assembled
and tested circuit board that demonstrates the
MAX7349 2-wire-interfaced, low-EMI key switch and
sounder controller. Windows® 98SE/2000/XP software
provides a handy user interface to exercise the features
of the MAX7349.
♦ Complete Evaluation System
♦ 7 x 8 Key Matrix Included
♦ Sounder Included
♦ Fully Assembled and Tested
Ordering Information
Windows is a registered trademark of Microsoft Corp.
PART
TEMP RANGE
INTERFACE TYPE
MAX7349EVKIT
0°C to +70°C
Windows software
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
220pF ceramic capacitor (0603),
not installed
TDK C1608X7R1H221K
0.1µF, 10V min X7R ceramic
capacitors (0603)
TDK C1608X7R1E104K
C1, C12–C16,
8
C34
C35
0
0
C23, C24
0.1µF ceramic capacitor (0603),
not installed
TDK C1608X7R1C104K
22µF, 16V ceramic capacitor (1210)
TDK C3225X5R1C226K
TDK C3225X5R1C226M
C3
C5
1
1
H1, H2
JU1
2
1
3
12-pin headers
0.033µF, 6.3V min X7R ceramic
capacitor (0603)
TDK C1608X7R1E333K
Murata GRM188R71E333K
Taiyo Yuden EMK107BJ333KA
2 x 4 dual-row vertical header
3-pin headers
JU2, JU3, JU6
JU4, JU5, JU9,
JU10
4
0
2-pin headers
22pF C0G ceramic capacitors (0603)
TDK C1608C0G1H220J
Murata GRM1885C1H220J
JU7, JU8, JU11
KEY0–KEY55
LED1, LED2
P1
2-pin headers, not installed
C6, C7
C8, C9
2
2
Momentary 6mm pushbutton switches
Omron B3F1000
56
2
10pF C0G ceramic capacitors (0603)
Murata GRM1885C1H100J
TDK C1608C0G1H100J
Red LEDs (T1-3/4)
Pizeoelectric sounder
Murata PKM22EPPH-4001-B0
1
1µF, 6.3V min X7R ceramic
capacitors (0603)
TDK C1608X5R0J105K
Murata GRM188R60J105K
Taiyo Yuden JMK107BJ105MA
USB series B right-angle PC mount
receptacle
C18, C19
2
P2
1
0
Vertical header, 2 x 5 pins, keyed
pin 7
P5 (JTAG)
0.22µF ceramic capacitor (0603),
not installed
TDK C1608X7R1A224K
C31
C32
C33
0
0
0
R1
1
3
3
2
2
2.2kΩ 5ꢀ resistor (1206)
1.5kΩ 5ꢀ resistors (1206)
470Ω 5ꢀ resistors (1206)
27Ω 5ꢀ resistors (1206)
10kΩ 5ꢀ resistors (1206)
R2, R5, R6
R7, R8, R9
R12, R13
R14, R15
0.068µF ceramic capacitor (0603),
not installed
TDK C1608X7R1E683K
0.022µF ceramic capacitor (0603),
not installed
TDK C1608X7R1H223K
2.61kΩ 1ꢀ resistor (1206),
not installed
R21
0
________________________________________________________________ Maxim Integrated Products
1
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.
MAX7349 Evaluation Kit
Component List (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
Volume control, 5kΩ
Panasonic EVL-HFAA01A53
21.5kΩ 1ꢀ resistor (1206),
not installed
VR1
1
R22
R23
R24
0
0
0
16MHz crystal (HC49/US),
parallel resonant, 20pF load
Citizen HC49US16.000MABJ
ECS ECS-160-20-4
32.4kΩ 1ꢀ resistor (1206),
not installed
Y1
1
21.5kΩ 1ꢀ resistor (1206),
not installed
Suntsu SCS20B-16.000MHZ-I
10Ω 5ꢀ resistor (1206),
not installed
6MHz crystal (HC49/US)
Citizen HC49US6.000MABJ
Suntsu SCS22B-6.000MHZ-I
R25
U1
0
1
1
Y2
Y3
1
1
Maxim MAX7349AEG (24-pin QSOP)
FTDI FT232BM
(32-pin TQFP, 7mm x 7mm)
32.768kHz watch crystal,
12.5pF cylindrical
Epson C-001R 32.7680K-A
Suntsu SCT3-32.768KHZ
U2
Maxim MAX8511EXK25-T
ADV top mark (5-pin SC70)
U3
U4
1
1
—
—
8
1
Shunts
93C46 type 3-wire EEPROM
16-bit architecture (8-pin SO)
MAX7349 EV kit PC board
Rubber bumpers, 0.100in (H) x
0.400in (W) square
U5
U6
1
0
Maxim MAXQ2000-RAX (68-pin QFN)
Maxim MAX4366EUA+ (8-pin µMAX)
—
—
4
1
USB high-speed A-to-B cable,
5ft (1.5m)
MAXQ is a registered trademark of Maxim Integrated Products, Inc.
Procedure
Component Suppliers
Do not turn on the power until all connections are
made.
SUPPLIER
Murata
PHONE
WEBSITE
1) Ensure that the jumper settings are in the default
positions. See Table 1.
770-436-1300 www.murata.com
Panasonic
714-373-7366 www.panasonic.com
2) Install the evaluation software on your computer by
running the INSTALL.EXE program on the installa-
tion disk. The program files are copied and icons
are created for them in the Windows Start menu.
Suntsu Frequency
Control
949-305-0220 www.suntsuinc.com
Taiyo Yuden
TDK
800-348-2496 www.t-yuden.com
847-803-6100 www.component.tdk.com
3) Connect the USB cable between the MAX7349 EV kit
and the computer. When you plug in the MAX7349 EV kit
board for the first time, the Windows plug-and-play
system detects the new hardware and automatically
runs the Add New Hardware Wizard. (If the Add
New Hardware Wizard does not appear after one
minute, unplug the USB cable and plug it in again.)
Be sure to specify the search location. This EV kit is
based on the CMAXQUSB design, so the software
includes a copy of the device driver in the installed
software directory. Refer to Application Note 3601
Troubleshooting Windows Plug-and-Play and USB
for Maxim Evaluation Kits for more details.
Note: Indicate that you are using the MAX7349 when contacting
these component suppliers.
Quick Start
Required Equipment
Before you begin, you need the following equipment:
•
•
•
Maxim MAX7349 EV kit
USB-type A-B cable (included with MAX7349EVKIT)
Windows 98SE/2000/XP computer with a spare
USB port
4) During device driver installation, Windows XP
shows a warning message, indicating that the
•
Administrator privileges may be required when first
installing the device on Windows 2000/XP
2
_______________________________________________________________________________________
MAX7349 Evaluation Kit
Table 1. Jumper Functions
SHUNT
JUMPER
FUNCTION
LOCATION
2
Pins 1 and 2* AD0 = GND; I C address 0x70 / 0x72
2
Pins 3 and 4 AD0 = SCL; I C address 0x7C / 0x7E
JU1
2
Pins 5 and 6 AD0 = VDD; I C address 0x74 / 0x76
2
Pins 7 and 8 AD0 = SDA; I C address 0x78 / 0x7A
Pins 1 and 2* Pizeo Sounder. P1 driven directly by SOUNDER output.
Pins 2 and 3 Pizeo Sounder. P1 driven through optional active filter circuit. Requires installing U6 and other components.
Pins 1 and 2* ALERT Input. Connected to VDD.
JU2
JU3
Pins 2 and 3 ALERT Input. Connected to GND.
No shunt
ALERT Input. Must be connected to an external drive signal.
2
Pins 1 and 2* SDA. Connected to on-board I C bus
JU4
JU5
2
No shunt
Pins 1 and 2* SCL. Connected to on-board I C bus.
No shunt SCL. Must be connected to an external I C bus
Pins 1 and 2* INT. Pulled up to on-board VDD supply.
Pins 2 and 3 INT. Pulled up to external INTVDD supply.
SDA. Must be connected to an external I C bus.
2
2
JU6
JU7
JU8
No shunt
Invalid Configuration. Do not use.
Not installed*
V
V
V
V
= 2.5V from U3
DDIO
DDIO
DD
PC board
trace cut open
. Must be provided externally. 2.5V < V
< 3.6V.
DDIO
Not installed*
= V
DDIO
PC board
trace cut open
Power to MAX7349. Must be provided externally. V
≤ V
.
DDIO
DD
DD
Pins 1 and 2* SDA. Connected to on-board pullup resistor.
No shunt SDA. Pullup resistor must be provided externally.
Pins 1 and 2* SCL. Connected to on-board pullup resistor.
No shunt SCL. Pullup resistor must be provided externally.
JU9
JU10
JU11
Not installed* JTAG Power. Not connected to USB power.
Pins 1 and 2 JTAG Power. Connected to USB power.
*Default configuration.
device driver Maxim uses does not contain a digital
signature. This is not an error condition. It is safe to
proceed with the installation.
8) Click the Initialize EV kit button to write the power-
up command and configure default settings for
demonstration. This button writes to three registers:
Write(0x04 configuration) = 0xF8; Write(0x01
debounce) = 0x3F; and Write(0x03 interrupt) = 0x10.
5) Verify that the EV kit’s LED1 is lit, indicating that the
USB is connected and providing power.
9) On the EV kit board, press the buttons in the
KEY0–KEY55 matrix. Verify that the key scan codes
are reported in the software’s history window after 5
to 6 keypress events are queued, depending on the
debounce time and interrupt register settings. The
6) Start the EV kit software by clicking its icon in the
Windows Start menu.
7) The software automatically connects to the board
after a few seconds.
________________________________________________________________________________________
3
MAX7349 Evaluation Kit
most recent scan code is identified in the Key Grid.
Click the 0x04 Configuration group’s Read button
and verify reported status sound from keypress.
The Interrupt Handler Actions checkboxes determine
what action the software takes when INT is active.
History Window
Each register read or write event is recorded in a scrol-
lable text window underneath the interrupt handler actions.
10) In the 0x05 Ports group, uncheck the GPO7 box
and click Write. Verify LED2 lights up.
11) In the 0x05 Ports group, check the GPO7 box and
click Write. Verify LED2 no longer lights.
Keyboard Navigation
When you type on the PC keyboard, the system must
know which control should receive the keys. Press the
Tab key to move the keyboard’s focus from one control
to the next. The focused control is indicated by a dotted
outline. Shift+Tab moves the focus to the previously
focused control. Buttons respond to the keyboard’s
spacebar. Some controls respond to the keyboard’s Up
and Down arrow keys. Activate the program’s menu bar
by pressing the F10 key, then press the letter of the
menu item you want. Most menu items have one letter
underlined, indicating their shortcut key.
12) Move shunt JU3 and observe the sounder beep in
response to the ALERT pin. Verify register 0x03
Interrupt shows ALERT as the source of interrupt.
Click the 0x04 Configuration group’s Read button
and verify reported status sound from keypress.
13) In the Sounder group, select the sounder com-
mands 125ms and C5 from the drop-down menus,
check the BUF = 0 box, and click Write. Verify the
sounder beeps. Click the 0x04 Configuration
group’s Read button and verify reported status
sound from keypress.
Detailed Description of Hardware
Detailed Description of Software
The MAX7349 (U1) scans a matrix of keys (KEY0–KEY55).
The evaluation kit provides a 7 x 8 matrix of keys,
although the MAX7349 is capable of scanning an 8 x 8
matrix. To demonstrate general-purpose output capabili-
ty, one of the scanning columns (COL7/PORT7) is con-
nected to an indicator (LED2).
Connecting to Hardware
The software automatically searches for the MAX7349
EV kit hardware when launched. Once the hardware is
found and connected, the I2C device address is shown
in the upper-left corner.
The FTDI FT232BM (U2) provides the USB engine. The
USB 5V power is regulated down to 2.5V by U3. LED1
indicates that USB 5V power is present.
Autoread
The software automatically reads registers every 2 to 3
seconds if Auto Read 1-7 is checked. This option should
be left unchecked when preparing to write new values.
Jumpers JU4 and JU5 optionally disconnect the
MAX7349 SCL/SDA, allowing the use of an external
user-provided I2C bus. Jumpers JU9 and JU10 option-
ally disable the on-board 1.5kΩ termination resistors R5
and R6, allowing the use of external user-provided I2C
pullup resistors.
Registers
Each of the MAX7349 registers is represented on the
software’s main window. See Figure 1. Each register has
its own Read and Write buttons. Clicking Read entire
FIFO now reads register 0x00 repeatedly, until the FIFO
indicates that all keypress events have been read.
To optionally improve the sounder output waveform,
space is provided to mount a MAX4366 (U6) and associ-
ated passive components C31–C35 and R21–R25 to form
a lowpass third-order Chebyshev filter and output stage,
as shown in Figure 12 of the MAX7347/MAX7348/
MAX7349 data sheet. If these filter components are
installed, move JU2 shunt to position 2-3 to use the filter
to drive the on-board pizeo transducer.
Key Grid
Whenever a keypress event is received, the key loca-
tion is shown on the Key Grid. This grid shows eight
rows and up to eight columns. Register 0x01
Debounce / Port Enable determines how many of the
column pins are taken away from the Key Grid and
used for general-purpose outputs.
The low-voltage RISC microcontroller, MAXQ2000-RAX
(U5), processes commands sent by a program running
on the PC. Each particular EV kit has its own custom
software specific to that kit. Connector P5 is used dur-
ing factory tests to program the MAXQ2000 in-circuit
using the JTAG interface. The connector pin configura-
tion is compatible with the MAXQ2000 evaluation kit’s
Interrupt Response
Although the PC software cannot respond to interrupts
with the speed of a true low-level hardware interrupt, the
software does offer flexibility for evaluation. The software
polls the status of the INT output pin every 2 seconds.
4
_______________________________________________________________________________________
MAX7349 Evaluation Kit
Figure 1. The MAX7349 Evaluation Software’s Main Window Provides Direct Access to All Registers and Controls the Interrupt Response
MAXQ-JTAG-001 board. The firmware loaded on this
board is identical to the CMAXQUSB interface module.
lated by using a subset of the MAX7349 pins and regis-
ter bits. See Tables 2 and 3.
Using an External I2C Bus Instead of USB
To disconnect from the on-board I2C bus, remove the
shunts from jumpers JU4 and JU5. Leave the USB con-
nector, P2, unconnected. Provide 2.5V to 3.6V power to
the GND and V+ test points on header H2. Connect the
external I2C bus to the SCL and SDA test points. If the
external I2C bus already has appropriate pullup resis-
tors, remove shunts from JU9 and JU10.
Emulating the MAX7347
The MAX7347 behaves just like the MAX7349, except it
has fewer columns (COL0–COL2), no ALERT input, and
no SOUNDER output. The MAX7347 cannot be fitted to
the PC board due to differences in pin count and pin con-
figuration, but the MAX7347 can be emulated by using a
subset of the MAX7349 pins and register bits. MAX7347
has a fixed I2C address, so connect AD0 to GND by
placing JU1 in position 1-2. Because there is no ALERT,
place JU3 in position 2-3. See Tables 2 and 3.
Emulating the MAX7348
The MAX7348 behaves just like the MAX7349, except it
has fewer columns (COL0–COL4) and no ALERT input.
Although a MAX7348 could be fitted to the PC board
(aligning pin 1 with ROW0), the MAX7348 can be emu-
_______________________________________________________________________________________
5
MAX7349 Evaluation Kit
Table 2. Pin Configuration when Emulating Other Devices
PIN
1
MAX7349 EV KIT SIGNAL
COL7/PORT7
ROW0
PIN
—
1
MAX7348 FUNCTION
PIN
—
1
MAX7347 FUNCTION
—
ROW0
ROW1
ROW2
ROW3
COL3/PORT3
COL4/PORT4
ROW4
ROW5
ROW6
ROW7
—
—
ROW0
ROW1
ROW2
ROW3
—
2
3
ROW1
2
2
4
ROW2
3
3
5
ROW3
4
4
6
COL3/PORT3
COL4/PORT4
ROW4
5
—
—
5
7
6
—
8
7
ROW4
ROW5
ROW6
ROW7
—
9
ROW5
8
6
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
ROW6
9
7
ROW7
10
—
—
20
19
18
17
16
15
14
13
12
11
—
8
COL6/PORT6
ALERT
—
—
16
15
14
13
—
12
—
11
10
9
—
—
V+
V+
V+
INT
INT
INT
SCL
SCL
SCL
SDA
SDA
SDA
AD0
AD0
—
GND
GND
GND
—
SOUNDER
COL0
SOUNDER
COL0
COL1
COL2/PORT2
—
COL0
COL1
COL2/PORT2
—
COL1
COL2/PORT2
COL5/PORT5
—
6
_______________________________________________________________________________________
MAX7349 Evaluation Kit
Table 3. Registers Affected when Emulating Other Devices
2
I C ADDRESS
REGISTER
MAX7348
MAX7347
0111 xx0 R/W
0 FIFO
—
—
No COL7/PORT7
No COL6/PORT6
No COL5/PORT5
No COL4/PORT4
No COL3/PORT3
No COL7/PORT7
No COL6/PORT6
No COL5/PORT5
0111 xx0 R/W
1 Debounce / Port Enable
0111 xx0 R/W
0111 xx0 R/W
0111 xx0 R/W
2 Auto Repeat
3 Interrupt
—
—
—
—
4 Configuration
No ALERT
No ALERT
No GPO7
No GPO6
No GPO5
No GPO4
No GPO3
No GPO7
No GPO6
No GOP5
0111 xx0 R/W
5 Ports
0111 xx0 R/W
0111 xx0 R/W
0111 xx1 R/W
6 Key Sound
—
—
—
No SOUNDER
No SOUNDER
No SOUNDER
7 Alert Sound
Sounder command
_______________________________________________________________________________________
7
MAX7349 Evaluation Kit
Figure 2. MAX7349 EV Kit Schematic (Sheet 1 of 4)
8
_______________________________________________________________________________________
MAX7349 Evaluation Kit
Figure 2. MAX7349 EV Kit Schematic (Sheet 2 of 4)
_______________________________________________________________________________________
9
MAX7349 Evaluation Kit
VDDIO
VDDIO
+2.5V
VDDIO
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
C23
C24
0.1µF
0.1µF
VDDIO
27
51
+2.5V
V
DDIO
C9
10pF
49
1
V
HF XIN
DDCPU
Y1
16MHz
SEG11/P1.3
SEG12/P1.4
SEG13/P1.5
SEG14/P1.6
SEG15/P1.7
SEG16/P2.0
SEG17/P2.1
SEG18/P2.2
SEG19/P2.3
SEG20/P2.4
SEG21/P2.5
SEG22/P2.6
SEG23/P2.7
SEG24/P3.0
SEG25/P3.1
SEG26/P3.2
SEG27/P3.3
GND
C8
10pF
50
2
HF XOUT
3
4
48
47
46
45
44
43
41
40
39
38
37
36
34
P6.5/TO/WKOUT
P6.4/TOB/WKOUT
P6.3/12/OW_IN
P6.2/T2B/OW_OUT
P6.1/T1/INT13
P6.0/T1B/INT12
P5.7/MISO
U1P65
5
U1P64
6
7
JU4
JU5
8
U5
SDA
9
SCL
MAXQ2000–RAX
EXPOSED PADDLE CONNECTS TO GND
10
11
12
13
14
15
16
17
28
42
P5.6/SCLK
P5.5/MOSI
SP5.4/SS
P5.3/TX1/INT11
P5.2/RX1/INT10
32KIN
U1P53
U1P52
Y3
32.768kHz
35
32KOUT
GND
18
19
20
21
22
23
24
25
26
29
30
31
32
33
Figure 2. MAX7349 EV Kit Schematic (Sheet 3 of 4)
10 ______________________________________________________________________________________
MAX7349 Evaluation Kit
V
Figure 2. MAX7349 EV Kit Schematic (Sheet 4 of 4)
______________________________________________________________________________________ 11
MAX7349 Evaluation Kit
Figure 3. MAX7349 EV Kit Component Placement Guide—Component Side
12 ______________________________________________________________________________________
MAX7349 Evaluation Kit
Figure 4. MAX7349 EV Kit PC Board Layout—Component Side
______________________________________________________________________________________ 13
MAX7349 Evaluation Kit
Figure 5. MAX7349 EV Kit PC Board Layout—Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2006 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
Springer
相关型号：
MAX734CSA+
Switching Regulator, Current-mode, 1.5A, 170kHz Switching Freq-Max, CMOS, PDSO8, PLASTIC, SO-8
MAXIM
MAX734ESA+
Switching Regulator, Current-mode, 1.5A, 170kHz Switching Freq-Max, CMOS, PDSO8, PLASTIC, SO-8
MAXIM
MAX734ESA-T
Switching Regulator, Current-mode, 1.5A, 170kHz Switching Freq-Max, CMOS, PDSO8, PLASTIC, SO-8
MAXIM
©2020 ICPDF网 联系我们和版权申明