Specifications

PART 2 – Cellular SocketModems Chapter 8 – SocketModemCell & iCell EV-DO (EV1)
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342P) 128
Pin-Out Specifications
Pin Signal Name
Logic Level
Voltage*
I/O Description
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
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
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-EV1-IP-xx
USB Data Pin Out
For Products: MTSMC-EV1-U, MTSMC-EV1-MI-IP-xx
Pins Available With Current PCB: 24-28, 33-41, 48-51, 58, 61, 63
Pins to Be Added to the Next PCB Revision: 22-23 and 42-43
Design Consideration – Very Important Note
The current revision of the PCB will not accommodate the following pins:
22-23 and 42-43.
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.