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 29
SIM interface
The external SIM interface is available through the 50-pin connector in order to use a stand-alone SIM
cardholder. 5V SIMs can be driven using an external level shifter.
SIM line must not exceed 15 cm. See also the “Hardware and RF” section of Chapter 5: Application
Considerations.
Five signals are available:
SIMVCC: SIM power supply.
SIMRST: reset.
SIMCLK: clock.
SIMDATA: I/O port.
SIMPRES1 SIM card detect. This signal is connected to the external SIM connector on pin 8. Pin 4 of SIM
connector must be pulled down to GND with 1 K.
This interface is fully compliant with GSM 11.11 recommendations concerning the SIM functionality.
Transient Voltage Suppressor diodes are internally added on the signals connected to the SIM socket in order to
prevent any Electro-Static Discharge. TVS diodes with low capacitance (less than 10pF) are connected on
SIMCLK and SIMDATA to avoid any disturbance of the rising and falling edge.
Table 3-23: SIM Interface Pin Description
Signal Pin Number I/O I/O Type* Description
SIMCLK 45 O 2X SIM Clock
SIMRST 46 O 2X SIM Reset
SIMDATA 49 I/O CMOS/2X SIM Data
SIMVCC 47 O SIM Power Supply
SIMPRES1 48 I CMOS SIM Card Detect
GPO0 50 O 2X SIM 3V or 5V
* See “Table 3-2: Operating Conditions” in section on the 50-pin Connector Description.
The SIM schematic appears later in this chapter.