User's Manual
Table Of Contents
- 1 Introduction
- 2 Module Power
- 3 Physical Interfaces
- Module Mounting to Host Board (Reference)
- Connectors
- Connectors
- I/O Connector Pin Assignments
- Circuit Protection
- Antenna
- Control Connector Signal Functions
- Module Power (Pins 85, 87, 89, 91, 93, 95, 97, 99)
- Power Control (Pin 35) - (PWR_CTL)
- Level Translation Reference Power (Pin 77)
- USB (Pins 1, 3, 5, 7, 9)
- General Purpose Input/Output Interface
- RTC Sleep
- Serial Interfaces & Handshake (Pins 11, 13, 15, 17, 19, 21, 23, 25)
- Multi-Channel Serial Interface (MCSI) – (Pins 12, 14, 16, 18)
- VBackup Input (Pin83)
- Using VBackup
- Analog-to-Digital Input (Pin 74)
- Handset Microphone Input (Pins 65, 67)
- Handset Microphone Bias Output (Pin 63)
- Handset Speaker Output (Pins 71, 73)
- Headset Microphone Input (Pin 55)
- Headset Microphone Bias Output (Pin 53)
- Headset Speaker Output Left & Right (Pins 57, 59)
- Headset Output Common Mode (Pin 61)
- Headset Detect (Pin 47)
- Subscriber Identity Module (SIM) Carrier (Pins 76, 78, 80, 82, 84)
- 4 Hardware Design
- General Design Guidelines for Using Novatel Wireless M2M GSM Modules
- Enabling the Transmission Modes for the GSM/GPRS Services
- Voice Communication
- Circuit-Switched Data
- SMS: Short Message Services
- Provisioning The SIM
- GSM Services Supported by the Novatel Wireless M2M Enabler IIIG Module
- GPRS Services Supported by the Novatel Wireless M2M Enabler IIIG Module
- Selecting the GSM Modes of Operation
- 5 Setup and Initialization
- 6 Integration and Testing
48 novatelwireless.com
Figure 4-3 Example of a GOOD RF Thermal Relief
Antenna And RF Signal Trace
The PCB trace that feeds the RF output port must be designed for a 50 ohm characteristic
impedance, coplanar, or routed into internal layers to keep the top layer continuous around
and underneath the Enabler module. Ample ground vias should be provided around the RF
contacts, the RF trace and launch pad. If possible, keep I/O and power traces away from the
RF port. This includes traces running parallel or orthogonal to it. Thermal relief should not be
used on the antenna output port ground pads. The designer must pay close attention to the
size of the pad and thickness of the dielectric beneath the signal pad and trace. Most PCB
manufacturers can adjust the trace width to maintain 50 ohms impedance if the traces are
identified and instructions are included on the FAB drawing. This service is typically provided
at no or minimal additional cost.
For minimum RF emissions due to the fundamental frequency of operation, the Enabler
module works best with an antenna load that has a VSWR of 1.5:1 or better. The antenna
should not have gain at the harmonic frequencies, otherwise, the conducted harmonics could
get amplified to a point where the product no longer passes type approval. However, for