Xircom An Intel Company GEM3501 User Manual
Core Engine GSM/GPRS Modem Developer Guide Preliminary Draft: 7/6/2001
17
Part Number: 07100026, Revision: 002
Confidential
© 2001 Xircom, Inc., an Intel company All rights reserved.
All trademarks and copyrights are the property of Xircom, Inc., an Intel company
All trademarks and copyrights are the property of Xircom, Inc., an Intel company
Pin
Signal
Name
I/O
Functionality
Parameters
56
SIM_GND
O
•
SIM
•
GND
57
DTR_1
I
•
Core is DCE
•
Data Terminal Ready (DTR)
•
Vil min = -0.3V
Vil max = 0.496V
•
Vih min = 1.771V
Vih max = 3.3V
58
SIM_VCC
O
•
SIM
•
T.B.D.
59
GND
*
•
(0V)
60
GND
*
•
(0V)
Table 2: Core Engine I/O Connector Pin Out
4.2 Core Engine I/O Signal Header [J4]
The Core Engine I/O signals can be accessed externally at a 60-pin header (connector J4
on the carrier board). The I/O interface signals are described in Table 2.
on the carrier board). The I/O interface signals are described in Table 2.
4.3 Ground Points [J2, J9]
Two ground points are provided (J2 and J9 on the carrier board) which can be used for
any probe hookup, for example to an oscilloscope.
any probe hookup, for example to an oscilloscope.
4.4 RF Antenna Connector [J5, J6]
The RF antenna may be connected to the Core Engine modem directly, or to the carrier
board (at connector J6). When connecting the RF antenna to the carrier board, a cable
must also be connected from the carrier board (at connector J5) to the RF connector on
the Core Engine board.
board (at connector J6). When connecting the RF antenna to the carrier board, a cable
must also be connected from the carrier board (at connector J5) to the RF connector on
the Core Engine board.
The Core Engine board uses a muRata Microminiature SMT Coaxial Connector (muRata
p/n “MM9329-2700”) for RF antenna connection.
p/n “MM9329-2700”) for RF antenna connection.
The carrier board uses an SMA connector for connection to an antenna, and a muRata
Microminiature SMT Coaxial Connector (muRata p/n “MM9329-2700”) for connection to
the Core Engine board RF connector.
Microminiature SMT Coaxial Connector (muRata p/n “MM9329-2700”) for connection to
the Core Engine board RF connector.
The Core Engine modem is designed to support interchangeable antenna types, provided
that each antenna has 50-ohm impedance and has been tuned to the frequency band
intended.
that each antenna has 50-ohm impedance and has been tuned to the frequency band
intended.
4.5 Power [J7, J8, J10]
The Core Engine carrier board requires an input voltage of 3.7 VDC +/- 0.3V (connectors
J7, J8 & J10 on the carrier board).
J7, J8 & J10 on the carrier board).
CAUTION: The carrier board powers the Core Engine board directly, and so must be
used with a 3.7V (+/- 0.3V) power supply only.
used with a 3.7V (+/- 0.3V) power supply only.