5 System Connector Interface

5.1 Overview

Electrical connections to the wireless modem (except the antenna), are made through the System Connector Interface. The system connector is a 60-pin, standard 0.05 in (1.27 mm) pitch device.

The system connector allows both board-to-board and board-to-cable connections to be made. Use a board-board connector to connect the wireless modem directly to a PCB, and a board-cable connector to connect the radio device via a cable. Surface mount mating connectors for the 60-pin system connector are available from Harwin (part number M50-3113022).

Figure 5.1-1 below shows the numbering of the connector pins.

A ground connection is provided at the mounting hole next to the RF connector on the wireless modem as shown below. Connect this ground point to the DGND pins of the wireless modem by the shortest, low-impedance path possible. The purpose of this connection is to allow any antenna ESD strikes to bypass the wireless modem’s internal ground path.

ground connection

pin 59

 

 

pin 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

pin 60

pin 2

Figure 5.1-1 Wireless modem, viewed from underneath

The following table gives the pin assignments for the system connector interface and a short description for each signal.

LZT 123 1834

29