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MAX3100 Evaluation Kit
Logic Loopback Test
Remove the shunts on JU3 and JU4 and place them on
pins 1-2 and 4-5 of J2, respectively. Press SW2 on the
EV kit board to send single-byte 0x05 on the TX line,
which is looped back on the RX line. The μC receives
this byte from the MAX3100 and displays it on the
seven-segment LED.
Press SW3 to send single-byte 0x06 on the TX line,
which is looped back on the RX line. The μC receives
this byte and displays it on the seven-segment LED.
During the logic loopback test, RTS is looped back to
CTS .
RS-232 Loopback Test
Disconnect the RS-232 serial cable from the EV kit. Place
the shunts of JU1–JU4 in the 1-2 position. Press SW2 to
send single-byte 0x05 on the TX line. The byte gets
transmitted out of the MAX3232’s transmitter line and
loops back to the MAX3232’s receiver line, as well as the
MAX3100 ’s RX line. The μC receives this byte from
the MAX3100 and displays it on the seven-segment LED.
Press SW3 to send single-byte 0x06 on the TX line. The
byte gets transmitted out of the MAX3232’s transmitter
line and loops back to the MAX3232’s receiver line as
well as the MAX3100’s RX line. The μC receives this
byte from the MAX3100 and displays it on the LED.
During the RS-232 loopback test, the RTS line is looped
back to the CTS line.
Table 1. MAX3100 EV Kit Jumper Descriptions (JU1–JU5)
JUMPER
JU1
JU2
JU3
JU4
JU5
SHUNT POSITION
Open*
1-2
Open*
1-2
1-2*
Open
1-2*
Open
1-2*
Open
DESCRIPTION
Normal operation
Short RS-232 TX and RX lines for EV kit RS-232 loopback test
Normal operation
Short RS-232 RTS and CTS lines for EV kit RS-232 loopback test
Normal operation
Open to isolate MAX3100 logic RX line from RS-232 receiver line
Normal operation
Open to isolate MAX3100 CTS logic line from RS-232 receiver line
MAX3100 connected to the on-board μC
MAX3100 connected to an external μC
*Default position.
Table 2. MAX3100 EV Kit DIP Switch SW5 Descriptions
SWITCH
SW5-1
SW5-2
SW5-3
SW5-4
SW5-5
SW5-6
SW5-7
SW5-8
POSITION
On*
Off
On*
Off
On*
Off
On*
Off
On*
Off
On*
Off
On*
Off
On*
Off
DIP SWITCH STATES
SW5.1 = 0
SW5.1 = 1
SW5.2 = 0
SW5.2 = 1
SW5.3 = 0
SW5.3 = 1
SW5.4 = 0
SW5.4 = 1
SW5.5 = 0
SW5.5 = 1
SW5.6 = 0
SW5.6 = 1
SW5.7 = 0
SW5.7 = 1
SW5.8 = 0
SW5.8 = 1
MAX3100 CONFIGURATION BITS
N/A
N/A
SHDNi = 0
SHDNi = 1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
IR = 0
IR = 1
ST = 0
ST = 1
*Default position.
6
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