User's Manual
Table Of Contents
- Introduction
- General Characteristics
- Feature Details
- Feature Descriptions
- Applications
- Mechanical Design Overview
- Mechanical Dimensions
- Climatic and Mechanical Environment Testing Compliance
- Introduction
- 50-Pin Connector Interfaces
- Flashing LED
- SIM Interface
- RF Interface
- DTE/DCE Interface Rates
- Serial Test/Demo Board Components
- Serial Test/Demo Board Block Diagram
- General Guidelines for the Use of the ModemModule
- Reference Documents
- Related Manuals
- Additional Information
- Safety Precautions
- Regulatory Standards Compliance
- Where to Find SMD Connectors
- GSM Antenna
- SIM Card Holder
- LIST OF TABLES
Chapter 3 – Electrical Characteristics
Wireless ModemModule MTMMC-G-F1 and MTMMC-G-F2 Developer’s Guide 20
Modem
Term in a lLevel Shifter
Vcc
RI
DCD
RX
CTS
DSR
DTR
TX
RTS
Vcc
28
25
1
3
24
23
22
19
17
16
21
20
18
13
C1+
C1-
C2+
T1IN
T2IN
T3IN
T4IN
T5IN
R1OUTB
R2OUT
R3OUT
R4OUT
ON
C2-
T1OUT
T2OUT
T3OUT
T4OUT
T5OUT
R1IN
R2IN
R3IN
ERROR
OFF
27
2
26
4
5
6
7
10
12
8
9
11
15
14
S_RI
S_DCD
S_RX
S_CTS
S_DSR
S_DTR
S_TX
S_RTS
Vcc
Vcc
GND
Vcc
GND
MAX 3238
*Th is appli cation n ote i s va lid for Vcc> 3.0 Volt (see MAX 3 238 sp e cification s)
Auto sh ut down mo de is not u sed in th is exa mple.
Figure 3-3: Level Shifter Application Diagram for Serial Link
ON / ~OFF Interface
This input is used to switch ON or OFF the ModemModule. A high level signal has to be provided on the
ON/~OFF pin to switch on the modem. The level of the voltage of this signal has to be maintained to VCC during
a minimum time of 1 second. When powered off, the shutdown current is roughly 60 microAmperes.
Table 3-9: ON / OFF Pin Description
Signal Pin Number I/O I/O Type* Description
ON / ~OFF 15 I CMOS Module Power ON/OFF