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MAX3223E Evaluation Kit
Table 1. MAX3223E EV Kit Jumper Descriptions (JU1–JU11)
JUMPER
JU1
JU2
JU3
JU4
JU5
JU6
JU7
JU8
JU9
JU10
JU11
SIGNAL
EN
FORCEON
FORCEOFF
INVALID
R2IN
DCDOUT
DSROUT
CTSOUT
T1IN
Loopback
T2IN
Loopback
RS232
Loopback
SHUNT
POSITION
1-2
2-3*
1-2*
2-3
1-2*
2-3
1-2*
Open
1-2*
2-3
Open
1-2*
2-3
1-2*
2-3
1-2*
2-3
1-2
Open*
1-2
Open*
1-2
Open*
DESCRIPTION
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
*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
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