General Description
The MAX7326 evaluation kit (EV kit) is a fully assem-
bled and tested printed-circuit board (PCB) that
demonstrates the capabilities of the MAX7326 I2C
port expander with 12 push-pull outputs and 4 inputs.
The MAX7326 EV kit also includes Windows®
2000/XP/Vista-compatible software that provides a
simple graphical user interface (GUI) for exercising the
MAX7326’s features.
The MAX7326 evaluation system (EV system) includes
a MAX7326 EV kit and a Maxim CMAXQUSB serial-
interface board. The CMAXQUSB board connects to a
PC’s USB port and allows the transfer of I2C commands
to the MAX7326 EV kit.
The EV kit comes with the MAX7326ATG+ installed.
Features
♦400kHz, 2-Wire Serial Interface
♦1.71V to 5.5V Operation
♦12 Push-Pull Output Ports, Rated at 20mA Sink
Current
♦4 Input Ports with Maskable Latching-Transition
Detection
♦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
Evaluate: MAX7326
MAX7326 Evaluation Kit/Evaluation System
________________________________________________________________
Maxim Integrated Products
1
19-1039; Rev 0; 11/07
Ordering Information
PART
TYPE
MAX7326EVKIT+
EV Kit
MAX7326EVCMAXQU+
EV System
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.
+
Denotes lead-free and RoHS-compliant.
Note: The MAX7326 EV kit software is designed for use with
the complete EV system (MAX7326EVCMAXQU+). The EV
system includes both the Maxim CMAXQUSB board and the
EV kit (MAX7326EVKIT+). If the Windows software will not be
used, the EV kit board can be purchased without the Maxim
CMAXQUSB board.
Component Lists
PART QTY DESCRIPTION
MAX7326EVKIT+ 1 MAX7326 EV kit
CMAXQUSB+ 1 Serial-interface board
MAX7326 EV System
DESIGNATION QTY DESCRIPTION
C1 1
10µF ±10%, 6.3V X5R ceramic
capacitor (0805)
TDK C2012X5R0J106K
C2 1
0.1µF ±10%, 25V X7R ceramic
capacitor (0603)
TDK C1608X7R1E104K
C3 1
47pF ±10%, 50V C0G ceramic
capacitor (0603)
TDK C1608C0G1H470J
D1, D3 2 Red LEDs (PLCC)
MAX7326 EV Kit
DESIGNATION QTY DESCRIPTION
D2, D4 2 Green LEDs (PLCC)
J1 1 2 x 10 right-angle female receptacle
JU1, JU2 2 5-pin, 4-way headers
JU3 1 2-pin header
JU4 1 3-pin header
R1–R4 4 150Ω ±5% resistors (0603)
R5–R9 5 10kΩ ±5% resistors (0603)
R10, R11 0 Not installed, resistors (0603)
R12 1 2kΩ ±5% resistor (0603)
S1–S4 4 Pushbutton switches
U1 1
Maxim I2C port expander with 12
push-pull outputs and 4 inputs
MAX7326ATG+ (24-pin TQFN-EP*,
4mm x 4mm)
— 1 PCB: MAX7326 Evaluation Kit+
*
EP = Exposed paddle.
Windows is a registered trademark of Microsoft Corp.
Evaluate: MAX7326
MAX7326 Evaluation Kit/Evaluation System
2 _______________________________________________________________________________________
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
• The MAX7326 EV system
MAX7326 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.
Procedure
1) Visit www.maxim-ic.com/evkitsoftware to download
the latest version of the EV kit software,
7326Rxx.ZIP. Save the EV kit software to a tempo-
rary folder and uncompress the ZIP file.
2) Install the MAX7326 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.
3) Enable the I2C pullup resistors on the CMAXQUSB
board by setting the DIP switches on SW1 to the ON
position.
4) For the MAX7326 EV kit, make sure the shunts of all
jumpers are in the following default positions:
JU1: (1-3) Combined with JU2 makes I2C
address = 0xC0, 0xA0
JU2: (1-4) Combined with JU1 makes I2C
address = 0xC0, 0xA0
JU3: (Open) Normal operation
JU4: (2-3) CMAXQUSB provides the power
supply
5) Connect the boards by aligning the MAX7326 EV
kit’s 20-pin connector with the 20-pin connector of
the CMAXQUSB board.
6) 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
this 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.
7) 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\MAX7326 (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.
8) Start the MAX7326 EV kit software by opening its
icon in the Start menu. The GUI main window will
appear, as shown in Figure 1.
9) Check or uncheck the O0 and O1 checkboxes
above the Write button, which is inside the Group A
Ports group box. Press the Write button and
observe the light change of the LEDs on the EV kit
board.
Component Supplier
SUPPLIER PHONE WEBSITE
TDK Corp. 847-803-6100 www.component.tdk.com
MAX7326 EV Kit Files
FILE DESCRIPTION
INSTALL.EXE Installs the EV kit files on your
computer
MAX7326.EXE Application program
FTD2XX.INF USB device driver file
UNINST.INI Uninstalls the EV kit software
USB_Driver_Help.PDF USB driver installation help file
Note: Indicate that you are using the MAX7326 when contact-
ing this component supplier.
Detailed Description of Software
To start the MAX7326 EV kit software, double click the
MAX7326 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 MAX7326 EV kit GUI
software: Group A Ports, Group B Ports, I2C
Addresses, and Interrupt 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.
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
MAX7326 IC data sheet for a detailed description.
Group B Ports Group Box
The Group B Ports group box also contains the Write
group box and the 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.
Evaluate: MAX7326
MAX7326 Evaluation Kit/Evaluation System
_______________________________________________________________________________________ 3
Figure 1. MAX7326 Evaluation Software Main Window
Evaluate: MAX7326
I2C Addresses Group Box
The I2C Addresses drop-down list automatically
detects the MAX7326’s I2C slave address when the
GUI software starts. If multiple devices are connected
to the I2C bus, the user can use this drop-down list to
manually change the device’s I2C 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 MAX7326 INT pin (active-low, latching transi-
tion-detection interrupt output).
MAX7326 Evaluation Kit/Evaluation System
4 _______________________________________________________________________________________
Table 1. The I2C Address Configuration
SHUNT POSITION
JU2 JU1 I2C ADDRESS
1-4 (SCL)* 1-3 (GND)* 1100000x (0xC0) and 1010000x (0xA0)
1-4 (SCL) 1-2 (VCC) 1100001x (0xC2) and 1010001x (0xA2)
1-4 (SCL) 1-4 (SCL) 1100010x (0xC4) and 1010010x (0xA4)
1-4 (SCL) 1-5 (SDA) 1100011x (0xC6) and 1010011x (0xA6)
1-5 (SDA) 1-3 (GND) 1100100x (0xC8) and 1010100x (0xA8)
1-5 (SDA) 1-2 (VCC) 1100101x (0xCA) and 1010101x (0xAA)
1-5 (SDA) 1-4 (SCL) 1100110x (0xCC) and 1010110x (0xAC)
1-5 (SDA) 1-5 (SDA) 1100111x (0xCE) and 1010111x (0xAE)
1-3 (GND) 1-3 (GND) 1101000x (0xD0) and 1011000x (0xB0)
1-3 (GND) 1-2 (VCC) 1101001x (0xD2) and 1011001x (0xB2)
1-3 (GND) 1-4 (SCL) 1101010x (0xD4) and 1011010x (0xB4)
1-3 (GND) 1-5 (SDA) 1101011x (0xD6) and 1011011x (0xB6)
1-2 (VCC) 1-3 (GND) 1101100x (0xD8) and 1011100x (0xB8)
1-2 (VCC) 1-2 (VCC) 1101101x (0xDA) and 1011101x (0xBA)
1-2 (VCC) 1-4 (SCL) 1101110x (0xDC) and 1011110x (0xBC)
1-2 (VCC) 1-5 (SDA) 1101111x (0xDE) and 1011111x (0xBE)
*
Default position.
Detailed Description of Hardware
The MAX7326 has 12 push-pull outputs and 4 inputs.
The MAX7326 EV kit board provides a proven layout for
evaluating the MAX7326. The EV kit comes with a
MAX7326ATG+ installed.
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.
I
2
C Address Configuration
The combination of shunt positions of jumpers JU1 and
JU2 determine the I2C slave address of the MAX7326
EV kit. See Table 1 to select the appropriate setting.
Power Supplies
The MAX7326 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.
User-Supplied I
2
C Interface
To use the MAX7326 EV kit with a user-supplied I2C
interface, install a shunt on jumper JU4’s 1-2 position.
Connect SDA, SCL, and GND lines from the user-
supplied I2C interface to the SDA, SCL, and GND pads
on the MAX7326 EV kit. Apply a 1.71V to 5.5V power
supply to the VDD pad of the MAX7326 EV kit.
Depending on the configuration of the user-supplied
I2C interface, it may be necessary to install the I2C
pullup resistors, R10 and R11.
Evaluate: MAX7326
MAX7326 Evaluation Kit/Evaluation System
_______________________________________________________________________________________ 5
JUMPER SHUNT POSITION DESCRIPTION
1-2 Reset
JU3 Open* Normal operation
Table 2. RST Jumper Configuration
*Default position.
JUMPER SHUNT
POSITION DESCRIPTION
1-2 User-supplied 1.71V to 5.5V power
supply (VDD)
JU4
2-3* Powered by CMAXQUSB
Table 3. V+ Selection Configuration
*Default position.
Evaluate: MAX7326
MAX7326 Evaluation Kit/Evaluation System
6 _______________________________________________________________________________________
VDD
GND
J1
1
3
5
7
9
11
13
15
17
19
2
4
6
8
10
12
14
16
18
20
VCC
VCC
JU4
1
2
3
R10
OPEN
SDA
VCC
R12
2kΩSCL
C3
47pF
SDA
C2
0.1μF
C1
10μF
VCC
VCC
R11
OPEN
R9
10kΩ
JU3
GND
SDA
SCL
SDA
VCC
JU1
2
3
4
5
1
SDA
SCL
VCC
12JU2
3
4
5
I2
I3
I4
I5
S2
S1
S3
S4
R3
150Ω
R4
150ΩD4
D3 VCC
VCC
R6
10kΩ
VCC
R7
10kΩ
R8
10kΩ
I5
I4
I3
VCC
O9
O8
O7
O10
O11
O12
O13
O14
O15
17
16
15
14
13
12
11
10
8
1
2
3
4
5
6
7
21
20
19
22
23
18
24
I3
I2
O1
O0
O7
O6
I5
I4
O8
O9
O10
O11
O12
O13
O14
O15
V+
SDA
SCL
INT
RST
AD0
AD2
GND
MAX7326
U1
O6
VCC
R5
10kΩ
I2
9
R1
150Ω
R2
150ΩD2
D1 VCC
Figure 2. MAX7326 EV Kit Schematic
Evaluate: MAX7326
MAX7326 Evaluation Kit/Evaluation System
_______________________________________________________________________________________ 7
Figure 3. MAX7326 EV Kit Component Placement Guide—
Component Side
Figure 4. MAX7326 EV Kit PCB Layout—Component 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.
8
_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Evaluate: MAX7326
MAX7326 Evaluation Kit/Evaluation System
Figure 5. MAX7326 EV Kit PCB Layout—Solder Side
