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WMOi3 Integrated Modem Technical Summary

January 2001 / Version 1.4

1. Overview

The WMOi3 is an integrated GSM modem module designed for reliable wireless communication in various industrial and commercial applications. This compact module provides complete GSM functionality with robust interfaces for easy integration into host systems.

Key attributes include:

• Full GSM 900/1800 MHz band support (dual-band)
• Integrated baseband processor and RF circuitry
• Comprehensive AT command interface
• 50-pin general purpose connector for all interfaces
• Designed for industrial temperature ranges

2. Features

2.1 Core Functionality

• GSM Phase 2/2+ compliant
• SMS text and PDU mode support
• Data/fax capabilities
• Embedded TCP/IP stack
• Support for voice calls

2.2 Interfaces

• Serial UART interface (RS-232 compatible)
• Analog audio interface
• Digital I/O lines
• Power management control signals
• SIM card interface (3V/1.8V)

2.3 System Control

• ON/~OFF control pin
• Hardware reset input (~RST)
• BOOT mode selection
• Power status indicators

3. Applications

The WMOi3 modem is suitable for a wide range of applications including:

3.1 Industrial Applications

• Remote monitoring and control systems
• Telemetry and SCADA systems
• Industrial automation
• Equipment monitoring

3.2 Commercial Applications

• POS terminals
• Vehicle tracking systems
• Security systems
• Wireless payment terminals

3.3 Consumer Applications

• Wireless gateways
• Remote data loggers
• Telematics devices

4. Electrical Characteristics

4.1 Power Supply

• Operating voltage: 3.3V to 4.6V DC
• Typical current consumption: 2mA in sleep mode
• Peak current (transmit burst): 2A
• Power-on surge current: 3A max

4.2 Serial Interface

• UART with hardware flow control (RTS/CTS)
• Default baud rate: 9600 bps (configurable up to 115200 bps)
• Data format: 8 data bits, no parity, 1 stop bit

4.3 RF Characteristics

• Frequency bands: GSM 900/1800 MHz
• Output power: Class 4 (2W) @ 900MHz, Class 1 (1W) @ 1800MHz
• Receiver sensitivity: -102dBm (typical)

5. Hardware Interfaces

5.1 50-pin General Purpose Connector

The primary interface connector provides access to all modem functions:

• Power supply pins (VBAT, GND)
• Serial interface (TXD, RXD, RTS, CTS)
• Control signals (ON/OFF, RESET, BOOT)
• SIM card interface
• Status indicators
• Audio interface

5.2 Power Management

• Controlled via ON/~OFF pin (active low)
• Programmable power saving modes
• Low-power sleep mode support

5.3 Reset Control

• Active-low reset input (~RST)
• Minimum pulse width: 100ms
• Internal power-on reset circuit

6. Package Information

6.1 Physical Dimensions

• Module size: 53mm x 34mm x 5mm
• Weight: approximately 15g
• Mounting: through-hole or socket

6.2 Connector Specifications

• 50-pin 0.5mm pitch board-to-board connector
• Mating height: 5mm
• Recommended mating cycles: 30

6.3 Environmental Specifications

• Operating temperature: -30°C to +75°C
• Storage temperature: -40°C to +85°C
• Relative humidity: 5% to 95% non-condensing

7. Safety and Compliance

7.1 RF Safety

• Complies with RF exposure guidelines
• Minimum safe distance: 20cm during operation
• Proper antenna installation required

7.2 Safety Standards

• GSM phase 2/2+ compliant
• CE marked
• RoHS compliant

7.3 Usage Precautions

• Not for use in medical life support systems
• Observe precautions in explosive atmospheres
• Follow aircraft and vehicle installation guidelines

8. Documentation and Support

Complete technical documentation includes:

• Hardware integration manual
• AT command reference
• Application notes
• Design guidelines

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