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 22
BOOT
This input is used to switch the ModemModule into download mode (backup procedure). The internal boot
procedure is started when this pin is low during the power ON of the module. In normal mode, this pin has to be
left open. If used, this input has to be driven by an open collector or an open drain. See below an example of
application diagram. See also the “Firmware Upgrade” section of Chapter 5: Application Considerations.
BOOT : Pin 23
Switch BOOT
Figure 3-6: Boot Procedure
If Switch Boot = 1, Boot pin 23 = 0, to download mode
If Switch Boot = 0, Boot pin 23 = 1, to normal mode
Table 3-10: BOOT Pin Description
Signal Pin Number I/O I/O Type* Description
BOOT 23 I CMOS SW downloading
* See “Table 3-2: Operating Conditions” in section on the 50-pin Connector Description.
Reset Signal (~RST)
This signal is used to force a reset of the ModemModule. It has to be used by providing low level during
approximately 2ms. This signal has to be considered as an emergency reset only. A reset procedure is already
driven by an internal hardware during the power-up sequence.
This signal can also be used to provide a reset to an external device. If no external reset is necessary this input
can be left open. If used (emergency reset), it has to be driven by an open collector or an open drain. See below
an example of application diagram.
Reset : Pin 23
Switch Reset
Figure 3-7: Reset Procedure
If switch Reset = 1, Reset pin 19 = 0
If switch Reset = 0, Reset pin 19 = 1