19-4469; Rev 0; 2/09
MAX3223E Evaluation Kit
General Description
The MAX3223E evaluation kit (EV kit) provides a proven
design to evaluate the MAX3223E 1µA supply current,
1Mbps, 3.0V to 5.5V, RS-232 transceivers with
AutoShutdown Plus™.
The MAX3223E EV kit PCB comes with a MAX3223EEUP+
installed.
o
Single-Supply Operation
o
6-Pin Signal Header
o
DCE-Connected DB9 Socket
o
Digital Loopbacks
o
RS-232 Loopbacks
o
Hardware Handshake Loopbacks
o
Lead(Pb)-Free and RoHS Compliant
o
Proven PCB Layout
o
Fully Assembled and Tested
Features
Evaluates: MAX3223E
Ordering Information
PART
TYPE
EV Kit
AutoShutdown Plus is a trademark of Maxim Integrated
Products, Inc.
MAX3223EEVKIT+
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
C1–C5
5
DESCRIPTION
0.1µF ±10%, 16V X7R ceramic
capacitors (0603)
TDK C1608X7R1C104K
10µF ±20%, 16V X5R ceramic
capacitor (1206)
Murata GRM31CR61C106M
10-pin headers
6-pin header
DB9 female right-angle receptacle
3-pin headers
2-pin headers
DESIGNATION QTY
LED1, LED2
R1, R2
2
2
DESCRIPTION
Red LEDs (0805)
470Ω ±5% resistors (0603)
±15kV ESD-protected, 1µA, 3.0V to
5.5V, 250kbps, RS-232 transceiver
with AutoShutdown Plus (20 TSSOP)
Maxim MAX3223EEUP+
Shunts
DB9 I/O extension cable, 6ft
PCB: MAX3223E Evaluation Kit+
C6
H1, H2
H3
J1
JU1, JU2, JU3,
JU5–JU8
JU4, JU9,
JU10, JU11
1
2
1
1
7
4
U1
1
—
—
—
11
1
1
Component Suppliers
SUPPLIER
Murata Electronics, North America, Inc.
TDK Corp.
PHONE
770-436-1300
847-803-6100
WEBSITE
www.murata-northamerica.com
www.component.tdk.com
Note:
Indicate that you are using the MAX3223E when contacting these component suppliers.
________________________________________________________________
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.
MAX3223E Evaluation Kit
Evaluates: MAX3223E
Quick Start—Digital Loopback
Required Equipment
•
•
•
MAX3223E EV kit (DB9 I/O extension cable included)
A user-supplied Windows
®
2000/XP- or Windows
Vista
®
-compatible PC with a spare RS-232 serial port
3.3V DC power supply
10) Move the JU1 shunt to pins 1-2 to disable the
MAX3223E.
11) In the RealTerm window, click in the display area
and type on the keyboard. With the MAX3223E dis-
abled, characters typed on the keyboard do not
appear in the display area.
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 under-
lined
refers to items from the Windows operating system.
Quick Start—External
Microcontroller
Required Equipment
Before beginning, the following equipment is needed:
• MAX3223E EV kit (DB9 I/O extension cable included)
•
•
•
A user-supplied Windows 2000/XP- or Windows
Vista-compatible PC with a spare RS-232 serial port
3.3V DC power supply
A user-supplied microcontroller, such as
MAXQ2000EVKIT or DS89C450-K00
Procedure
The MAX3223E EV kit is fully assembled and tested.
Follow the steps below to verify board operation. This
procedure is written for one particular terminal emulator
(RealTerm version 2.0.0.57), but any terminal emulation
software should work.
1) Visit
www.maxim-ic.com/evkitsoftware
to down-
load the latest version of the EV kit software,
3223Rxx.ZIP. Save the EV kit software to a tempo-
rary folder and uncompress the ZIP file. The EV kit
software consists of the free, open-source ter-
m i n a l emulator, RealTerm (also available from
http://realterm.sourceforge.net).
2) Verify that all jumpers (JU1–JU11) are in their
default positions, as shown in Table 1.
3) Connect the 3.3V DC power supply between the
VCC and GND pads on EV kit.
4) Connect the DB9 I/O extension cable between the
EV kit and the computer’s serial port.
5) Start the RealTerm software by opening its icon in
the
Start | Programs
menu. The RealTerm software
main window appears, as shown in Figure 1.
Note:
If the serial cable is connected to a serial port other
than COM1, then bring up the
Port
tab and open
the corresponding serial port.
6) Install a shunt across jumper JU1 pins 2-3 to
enable normal operation.
7) Install a shunt across jumper JU9 pins 1-2 to
enable digital loopback.
8) Enable the 3.3V DC power supply.
9) In the RealTerm window, click in the display area
and type on the keyboard. The digital loopback con-
nection immediately relays each character from the
receiver to the transmitter, so each character typed
on the keyboard appears in the display area.
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 under-
lined
refers to items from the Windows operating system.
Procedure
The MAX3223E EV kit is fully assembled and tested.
Follow the steps below to verify board operation. This
procedure is written for one particular terminal emulator
(RealTerm version 2.0.0.57), but any terminal emulation
software should work.
1) Visit
www.maxim-ic.com/evkitsoftware
to down-
load the latest version of the EV kit software,
3223Rxx.ZIP. Save the EV kit software to a tempo-
rary folder and uncompress the ZIP file. The EV kit
software consists of the free, open-source ter-
m i n a l emulator, RealTerm (also available from
http://realterm.sourceforge.net).
2) Verify that all jumpers (JU1–JU11) are in their
default positions, as shown in Table 1.
3) Connect the 3.3V DC power supply between the
VCC and GND pads on EV kit.
4) Connect the DB9 I/O extension cable between the
EV kit and the computer’s serial port.
5) Start the RealTerm software by opening its icon in
the
Start | Programs
menu. The RealTerm software
main window appears, as shown in Figure 1.
Note:
If the serial cable is connected to a serial port other
than COM1, then bring up the
Port
tab and open
the corresponding serial port.
Windows and Windows Vista are registered trademarks of Microsoft Corp.
2
_______________________________________________________________________________________
MAX3223E Evaluation Kit
Evaluates: MAX3223E
Table 1. MAX3223E EV Kit Jumper Descriptions (JU1–JU11)
JUMPER
JU1
JU2
JU3
JU4
SIGNAL
EN
FORCEON
FORCEOFF
INVALID
SHUNT
POSITION
1-2
2-3*
1-2*
2-3
1-2*
2-3
1-2*
Open
1-2*
JU5
R2IN
2-3
Open
JU6
JU7
JU8
DCDOUT
DSROUT
CTSOUT
T1IN
Loopback
T2IN
Loopback
RS232
Loopback
1-2*
2-3
1-2*
2-3
1-2*
2-3
1-2
Open*
JU10
1-2
Open*
JU11
1-2
Open*
EN
= VCC
EN
= GND
FORCEON = VCC
FORCEON = GND
FORCEOFF
= VCC
FORCEOFF
= GND
INVALID
drives LED2
INVALID
is not connected to LED2
R2IN is driven by DTRIN from connector J1
R2IN is driven by RTSIN from connector J1
R2IN is not connected to J1
DCDOUT drives DTRIN from connector J1
DCDOUT drives T2OUT from U1
DSROUT drives DTRIN from connector J1
DSROUT drives T2OUT from U1
CTSOUT drives RTSIN from connector J1
CTSOUT drives T2OUT from U1
T1IN is driven by R1OUT from U1. Data received from RS-232 side loops back at
digital connection.
T1IN is not connected to R1OUT
T2IN is driven by R2OUT from U1. Handshake received from RS-232 side loops
back at digital connection.
T2IN is not connected to R2OUT
R1IN is driven by T1OUT from U1. Data received from digital side loops back at
RS-232 connection.
R1IN is not connected to T1OUT
DESCRIPTION
JU9
*Default
position.
6) Install a shunt across jumper JU1 pins 2-3 to
enable normal operation.
7) Enable the 3.3V DC power supply.
8) Connect the microcontroller’s 3.3V bus to the EV kit
header’s H3 VCC (H3-1) pin.
9) Connect the microcontroller’s UART RXD input to
the EV kit header’s H3 R1OUT (H3-2) output.
10) Connect the microcontroller’s UART TXD output to
the EV kit header’s H3 T1IN (H3-3) input.
11) Connect the microcontroller’s ground return to the
EV kit header’s H3 GND (H3-6) pin.
12) In the RealTerm window, click in the display area
and type on the keyboard. Characters typed from
the keyboard are sent to the microcontroller UART.
Characters sent by the microcontroller UART are
displayed in the terminal window.
Detailed Description of Hardware
The MAX3223E EV kit provides a proven layout for the
MAX3223E. Capacitors C1–C4 are used by the charge
pump to generate the internal V+ and V- supplies from
VCC. Capacitors C5 and C6 bypass the VCC supply.
Header H3 provides the digital connections to the
MAX3223E. Jumpers JU1, JU2, and JU3 control the
_______________________________________________________________________________________
3
MAX3223E Evaluation Kit
Evaluates: MAX3223E
Figure 1. RealTerm Software Main Window (Port Tab Sheet)
MAX3223E power-management signals. Jumper JU4
connects the
INVALID
status output to LED2. Jumpers
JU5–JU8 configure the hardware handshake signals.
Jumpers JU9 and JU10 allow digital loopback. Jumper
JU11 allows RS-232 loopback.
The DCE-connected RS-232 connector (J1) uses
MAX3223E transmitter 1 and receiver 1 for the serial data.
MAX3223E transmitter 2 and receiver 2 can optionally be
used for DTR-DSR or RTS-CTS hardware handshake.
If the hardware handshake is not being actively man-
aged by a microcontroller, then the corresponding
handshake signals should be connected together to
allow data to flow. Without a hardware handshake con-
nection, communication may be blocked.
Tables 2 and 3 provide suggested jumper settings for
the two most common hardware handshakes.
Hardware Handshakes
A hardware handshake consists of two or more signal
wires used to control the flow of information on the other
wires. The MAX3223E does not enforce any hardware
handshake convention, but allows a microcontroller to use
the secondary receiver/transmitter to conduct active flow
control using one of the defined hardware handshakes.
4
_______________________________________________________________________________________
MAX3223E Evaluation Kit
Evaluates: MAX3223E
Table 2. Jumper Settings for DTR-DSR Handshake (JU5–JU8)
JUMPER
JU5
JU6
JU7
JU8
SIGNAL
R2IN
DCDOUT
DSROUT
CTSOUT
SHUNT
POSITION
1-2
1-2
2-3
1-2
DESCRIPTION
R2IN is driven by DTRIN from connector J1
DCDOUT = DTRIN from connector J1
DSROUT = T2OUT from U1
CTSOUT = RTSIN from connector J1
Table 3. Jumper Settings for RTS-CTS Handshake (JU5–JU8)
JUMPER
JU5
JU6
JU7
JU8
SIGNAL
R2IN
DCDOUT
DSROUT
CTSOUT
SHUNT
POSITION
2-3
1-2
1-2
2-3
R2IN = RTSIN from connector J1
DCDOUT = DTRIN from connector J1
DSROUT = DTRIN from connector J1
CTSOUT = T2OUT from U1
DESCRIPTION
_______________________________________________________________________________________
5
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