Typical application – Multi-Tech Systems Modem Module MT3334SMI User Manual
Page 13

Chapter 1 - Introduction and Description
MT3334SMI
13
Typical Application
The table below shows the MT3334SMI pinouts and Figure 1-6 illustrates a typical OEM application.
Pin #
Circuit Type
Signal Description
Input/Output
1
RJ
-11 Jack
Tip
Input/Output
2
RJ-11 Jack
Ring
Input/Output
26
External Call Status LEDs
DGND
29
External Call Status LEDs
DCD
Output
30
External Call Status LEDs
RX
Output
31
External Call Status LEDs
DTR
Output
32
External Call Status LEDs
TX
Output
33
Serial TTL
RTS
Input
34
Serial TTL
RXD
Output
35
Serial TTL
TXD
Input
36
Serial TTL
RI
Output
37
Serial TTL
DSR
Output
38
Serial TTL
CTS
Output
39
Serial TTL
DCD
Output
40
Serial TTL
DTR
Input
41
Serial TTL
DGND
61
Power
VCC
63
Audio
AGND
64
Audio
SPKR
24
26
29
30
31
32
1
2
1 - x
2 - x
3
4
5 - x
6 - x
64
63
61
Speaker Driver
Circuitry
+5v DC Power
RJ-11
Jack
41
40
39
38
37
36
35
34
33
Digital Ground
UART
Reset
Call-status
LED
Circuitry
Figure 1-6. MT3334SMI Typical OEM Application
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