19-1033; Rev 0; 11/07
MAX7325 Evaluation Kit/Evaluation System
General Description
The MAX7325 evaluation kit (EV kit) is a fully assembled
and tested printed-circuit board (PCB) that demon-
strates the capabilities of the MAX7325 I
2
C port
expander with eight push-pull outputs and eight open-
drain I/Os. The MAX7325 EV kit also includes
Windows
®
2000/XP/Vista-compatible software that pro-
vides a simple graphical user interface (GUI) for exer-
cising the MAX7325’s features.
The MAX7325 evaluation system (EV system) includes
a MAX7325 EV kit and a Maxim CMAXQUSB serial-
interface board. The CMAXQUSB board connects to a
PC’s USB port and allows the transfer of I
2
C commands
to the MAX7325 EV kit.
The EV kit comes with the MAX7325ATG+ installed.
♦
400kHz, 2-Wire Serial Interface
♦
1.71V to 5.5V Operation
♦
8 Push-Pull Output Ports
♦
8 Open-Drain I/O Ports, Rated to 20mA Sink
Current
♦
Input Ports are Overvoltage Protected to 6V
♦
Proven PCB Layout
♦
Windows 2000/XP/Vista (32-Bit)-Compatible
Software
♦
Fully Assembled and Tested
♦
EV System: USB PC Connection
Features
Evaluate: MAX7325
Ordering Information
PART
MAX7325EVKIT+
MAX7325EVCMAXQU+
TYPE
EV Kit
EV System
+Denotes
lead-free and RoHS-compliant.
Note:
The MAX7325 EV kit software is designed for use with
the complete EV system (MAX7325EVCMAXQU+). The EV
system includes both the Maxim CMAXQUSB board and the
EV kit (MAX7325EVKIT+). If the Windows software will not be
used, the EV kit board can be purchased without the Maxim
CMAXQUSB board.
Component Lists
MAX7325 EV System
PART
MAX7325EVKIT+
CMAXQUSB+
QTY
1
1
DESCRIPTION
MAX7325 EV kit
Serial-interface board
DESIGNATION
J1
JU1, JU2
JU3
JU4
R1–R6
DESIGNATION
C1
QTY
1
DESCRIPTION
10µF ±10%, 6.3V X5R ceramic
capacitor (0805)
TDK C2012X5R0J106K
0.1µF ±10%, 25V X7R ceramic
capacitor (0603)
TDK C1608X7R1E104K
47pF ±10%, 50V C0G ceramic
capacitor (0603)
TDK C1608C0G1H470J
Red LEDs (PLCC)
Green LEDs (PLCC)
R7, R8, R9
R10, R11
R12
S1–S4
QTY
1
2
1
1
6
3
0
1
4
DESCRIPTION
2 x 10 right-angle female receptacle
5-pin, 4-way headers
2-pin header
3-pin header
150Ω ±5% resistors (0603)
10kΩ ±5% resistors (0603)
Not installed, resistors (0603)
2kΩ ±5% resistor (0603)
Pushbutton switches
Maxim I
2
C port expander with 8
push-pull outputs and 8 open-drain
I/Os
MAX7325ATG+ (24-pin TQFN-EP*,
4mm x 4mm)
PCB: MAX7325 Evaluation Kit+
MAX7325 EV kit
C2
1
U1
1
C3
D1, D3, D5, D6
D2, D4
1
4
2
—
1
*EP
= Exposed paddle.
Windows is a registered trademark of Microsoft Corp.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
MAX7325 Evaluation Kit/Evaluation System
Evaluate: MAX7325
Component Supplier
SUPPLIER
TDK Corp.
PHONE
847-803-6100
WEBSITE
www.component.tdk.com
Note:
Indicate that you are using the MAX7325 when contact-
ing this component supplier.
3) Enable the I
2
C pullup resistors on the CMAXQUSB
board by setting the DIP switches on SW1 to the ON
position.
4) For the MAX7325 EV kit, make sure that the shunts
of all jumpers are in the following default positions:
JU1: (1-3)
JU2: (1-4)
Combined with JU2 makes I
2
C
address = 0xC0, 0xA0
Combined with JU1 makes I
2
C
address = 0xC0, 0xA0
MAX7325 EV Kit Files
FILE
INSTALL.EXE
MAX7325.EXE
FTD2XX.INF
UNINST.INI
USB_Driver_Help.PDF
DESCRIPTION
Installs the EV kit files on your
computer
Application program
USB device driver file
Uninstalls the EV kit software
USB driver installation help file
5)
6)
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
• The MAX7325 EV system
MAX7325 EV kit
Maxim CMAXQUSB board
USB cable (included with CMAXQUSB)
• A user-supplied Windows 2000/XP/Vista-compatible
PC with a spare USB port
Note:
In the following sections, software-related items
are identified by bolding. Text in
bold
refers to items
directly from the EV kit software. Text in
bold and
underlined
refers to items from the Windows operating
system.
7)
Procedure
1) Visit www.maxim-ic.com/evkitsoftware to download
the latest version of the EV kit software,
7325Rxx.ZIP. Save the EV kit software to a tempo-
rary folder and uncompress the ZIP file.
2) Install the MAX7325 evaluation software on your
computer by running the INSTALL.EXE program
inside the temporary folder. The program files are
copied and icons are created in the Windows
Start
menu.
8)
9)
JU3: (Open) Normal operation
JU4: (2-3)
CMAXQUSB provides the power
supply
Connect the boards by aligning the MAX7325 EV
kit’s 20-pin connector with the 20-pin connector of
the CMAXQUSB board.
Connect the USB cable from the PC to the
CMAXQUSB board. A
Building Driver Database
window pops up in addition to a
New Hardware
Found
message if this is the first time it is used on
the PC. If you do not see a window that is similar to
the one described above after 30s, remove the USB
cable from the CMAXQUSB and reconnect it.
Administrator privileges are required to install the
USB device driver on Windows 2000/XP/Vista.
Follow the directions of the
Add New Hardware
Wizard
to install the USB device driver. Choose the
Search for the best driver for your device
option.
Specify the location of the device driver to be
C:\Program Files\MAX7325
(default installation
directory) using the
Browse
button. During device
driver installation, Windows may show a warning
message indicating that the device driver Maxim
uses does not contain a digital signature. This is not
an error condition and it is safe to proceed with
installation. Refer to the
USB_Driver_Help.PDF
docu-
ment for additional information.
Start the MAX7325 EV kit software by opening its
icon in the
Start
menu. The GUI main window will
appear, as shown in Figure 1.
Check or uncheck the
O8
and
O9
checkboxes
above the
Write
button, which is inside the
Group B
Ports
group box. Press the
Write
button and
observe the light change of the LEDs on the EV kit
board.
2
_______________________________________________________________________________________
MAX7325 Evaluation Kit/Evaluation System
Detailed Description of Software
To start the MAX7325 EV kit software, double click the
MAX7325 EV kit icon that is created during installation.
The GUI main window appears, as shown in Figure 1.
There are four group boxes on the MAX7325 EV kit GUI
software:
Group A Ports, Group B Ports, I2C
Addresses,
and
Interrupt Status.
Pressing the
Single-byte Read
button only reads the
port status. Pressing the
Two-byte Read
button will
read both port status and flag status. Refer to the
MAX7325 IC data sheet for a detailed description.
Evaluate: MAX7325
Group B Ports Group Box
The
Group B Ports
group box also contains a
Write
group box and a
Read
group box.
Check or uncheck the desired checkboxes in the
Write
group box and press the
Write
button to write the port
settings to the device.
Press the
Read
button to read the port status.
Group A Ports Group Box
The
Group A Ports
group box shown in Figure 1 con-
tains the
Write
group box and the
Read
group box.
The
Read
group box consists of two sections:
Port
Status
and
Flag Status.
Check or uncheck the desired checkboxes in the
Write
group box and press the
Write
button to write the port
settings to the device.
Figure 1. MAX7325 Evaluation Software Main Window
_______________________________________________________________________________________
3
MAX7325 Evaluation Kit/Evaluation System
Evaluate: MAX7325
I2C Addresses Group Box
The
I2C Addresses
drop-down list automatically
detects the MAX7325’s I
2
C slave address when the GUI
software starts. If multiple devices are connected to the
I
2
C bus, the user can use this drop-down list to manual-
ly change the device’s I
2
C slave address according to
the shunt position of JU1 and JU2, as shown in Table 1.
Interrupt Status Group Box
The
Interrupt Status
group box shows the current sta-
tus of the MAX7325
INT
pin (active-low, latching transi-
tion-detection interrupt output).
Table 1. The I
2
C Address Configuration
SHUNT POSITION
JU2
1-4 (SCL)*
1-4 (SCL)
1-4 (SCL)
1-4 (SCL)
1-5 (SDA)
1-5 (SDA)
1-5 (SDA)
1-5 (SDA)
1-3 (GND)
1-3 (GND)
1-3 (GND)
1-3 (GND)
1-2 (VCC)
1-2 (VCC)
1-2 (VCC)
1-2 (VCC)
JU1
1-3 (GND)*
1-2 (VCC)
1-4 (SCL)
1-5 (SDA)
1-3 (GND)
1-2 (VCC)
1-4 (SCL)
1-5 (SDA)
1-3 (GND)
1-2 (VCC)
1-4 (SCL)
1-5 (SDA)
1-3 (GND)
1-2 (VCC)
1-4 (SCL)
1-5 (SDA)
I
2
C ADDRESS
1100000x (0xC0) and 1010000x (0xA0)
1100001x (0xC2) and 1010001x (0xA2)
1100010x (0xC4) and 1010010x (0xA4)
1100011x (0xC6) and 1010011x (0xA6)
1100100x (0xC8) and 1010100x (0xA8)
1100101x (0xCA) and 1010101x (0xAA)
1100110x (0xCC) and 1010110x (0xAC)
1100111x (0xCE) and 1010111x (0xAE)
1101000x (0xD0) and 1011000x (0xB0)
1101001x (0xD2) and 1011001x (0xB2)
1101010x (0xD4) and 1011010x (0xB4)
1101011x (0xD6) and 1011011x (0xB6)
1101100x (0xD8) and 1011100x (0xB8)
1101101x (0xDA) and 1011101x (0xBA)
1101110x (0xDC) and 1011110x (0xBC)
1101111x (0xDE) and 1011111x (0xBE)
*Default
position.
4
_______________________________________________________________________________________
MAX7325 Evaluation Kit/Evaluation System
Detailed Description of Hardware
The MAX7325 has eight push-pull outputs and eight
open-drain I/Os. The MAX7325 EV kit board provides a
proven layout for evaluating the MAX7325. The EV kit
comes with a MAX7325ATG+ installed.
Power Supplies
The MAX7325 EV kit can either be powered from the
CMAXQUSB (2.5V, 3.3V, and 5V) or from a user-
supplied 1.71V to 5.5V power supply connecting to
VDD, as shown in Table 3.
If a user-supplied power supply is used, ensure that the
voltage setting is compatible with the CMAXQUSB JU1
setting.
Evaluate: MAX7325
Hardware-Reset Control
The hardware-reset function is controlled by jumper
JU3, as shown in Table 2. Putting a shunt in the 1-2
position resets all registers and puts the device in the
power-on-reset state.
Table 3. V+ Selection Configuration
JUMPER
JU4
SHUNT POSITION
1-2
2-3*
DESCRIPTION
User-supplied 1.71V to
5.5V power supply (VDD)
Powered by CMAXQUSB
Table 2.
RST
Jumper Configuration
JUMPER
JU3
SHUNT POSITION
1-2
Open*
DESCRIPTION
Reset
Normal operation
*Default position.
*Default position.
User-Supplied I
2
C Interface
I
2
C
Address Configuration
To use the MAX7325 EV kit with a user-supplied I
2
C
interface, install a shunt on jumper JU4’s 1-2 position.
Connect SDA, SCL, and GND lines from the user-
supplied I
2
C interface to the SDA, SCL, and GND pads
on the MAX7325 EV kit. Apply a 1.71V to 5.5V power
supply to the VDD pad of the MAX7325 EV kit.
Depending on the configuration of the user-supplied
I
2
C interface, it may be necessary to install I
2
C pullup
resistors, R10 and R11.
The combination of shunt positions of jumpers JU1 and
JU2 determine the I
2
C slave address of the MAX7325
EV kit. See Table 1 to select the appropriate setting.
_______________________________________________________________________________________
5
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