Installation Manual

PART 2 – Cellular SocketModems Chapter 6 – SocketModem iCell – EV-DO
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342M) 101
Pin-Out Specifications
Pin Signal Name
Logic Level
Voltage*
I/O Description
J18 SPI SPCK 3.3 O SPI clock signal
J19 SPI MISO 3.3 I SPI master-in/slave-out
J20 SPI MOSI 3.3 O SPI master-out/slave-in
J21 SPI CS 3.3 O SPI chip select
J24 –RESET 3.3 – 5.0 I Device reset (active low)
J25 USB VBUS 3.3 – 5.0 I USB power supply input
J26 GND GND GND Ground
J27 USB DP 3.3 I/O USB data
J28 USB DM 3.3 I/O USB data
J33 –RTS 5.0 I Request to send (active low)
J34 –RXD 5.0 O Received data (active low)
J35 –TXD 5.0 I Transmitted data (active low)
J36 –RI 5.0 O Ring indicator (active low)
J37 –DSR 5.0 O Data set ready (active low)
J38 –CTS 5.0 O Clear to send (active low)
J39 –DCD 5.0 O Data carrier detect (active low)
J40 –DTR 5.0 I Data terminal ready (active low)
J41 GND GND GND Ground
J44 PCM OUT 2.6 O PCM data output
J45 PCM IN 2.6 I PCM data input
J46 PCM SYNC 2.6 O PCM frame synchronization
J47 PCM CLK 2.6 O PCM clock
J48 GPIO0 3.3 I/O User configurable general purpose I/O
J49 GPIO1 3.3 I/O User configurable general purpose I/O
J50 GPIO2 3.3 I/O User configurable general purpose I/O
J51 GPIO3 3.3 I/O User configurable general purpose I/O
J55 HEARTBEAT 3.3 O Heartbeat from processor
J58 –LED LINK 3.3 O Link status (active low, can sink up to 150mA)
J61 VCC 5.0 PWR DC input power
J63 GND GND GND Ground
*Note: A hyphen (-) indicates a range of acceptable logic levels.
Serial Model Pin Out
24, 26, 33-41, 61, 63
For Products: MTSMC-EV2-IP-xx, MTSMC-EV2-GP-xx
USB + Serial + GPIO + Voice + GPS Data Pin Out
For Products: MTSMC-EV2-MI-IP-xx, MTSMC-EV2-MI-GP-xx
Pins Available With Current PCB: 24-28, 33-41, 48-51, 58, 61, 63
Pins to Be Added to the Next PCB Revision: 16-17, 22-28, 33-43, 48-51, 58, 61, 63, new GPS data pin
Design Consideration – Very Important Note
The current revision of the PCB will not accommodate the following pins:
22-23, 42-43 and the new GPS data pins 16-17.
While these pins are not present at this time, they will be present on the
next hardware release.
You, as the developer, must take these new pins into account in your
product design even if you have no plans for using them.