Modem User Manual

MTX-H15 UMTS-HSDPA terminal modem http://www.matrix.es
MTX-H15 User Manual V.2.0 Pag. 13
Preliminary. Subject to change without prior notice
3. ELECTRICAL DESCRIPTION
All electrical connections to the module are protected in compliance with the standard air and contact
Electrostatic Discharge (ESD).
The module uses the following industry standard connectors:
• USB port
• RJ12 6-way (power supply connector)
• RJ12 4-way (handset connector)
• SIM card reader
• FME male coaxial jack (antenna connector)
3.1 Power Connector
An RJ12 6-way connector, as shown and described below, serves means of supplying and controlling d.c.
power to the modem.
The supply voltage, VCC, required by the modem is in the range 6-32V d.c. The power supply has to be a
single voltage source of POWER=6V…30V capable of providing a peak during an active transmission. The
uplink burst causes strong ripples (drop) on the power lines.
Application of the supply voltage does not switch the modem on. To do so an additional active-high control
signal, TURN_ON, must applied for > 0.2s.
A second active-high control signal, TURN_OFF, can be used to switch modem off when applied for 1 - 2
seconds, or can be used to perform hardware reset when applied for > 3.5s.
Note. VCC and GND are reverse polarity and overvoltage protected.
PIN: Signal Dir Limits Description
1 VCC Input 6 - 32 V DC Positive power input
2 Not connected -
3 TURN_OFF Input
6 – 32 V
Active high control line used to switch off or
reset the modem
VIH > 5V, VIL < 2V
Power off: t >10ms
4 TURN_ON Input
6 – 32 V
Active high control line used to switch on the
modem
VIH > 5V, VIL < 2V
Power on: t > 0.2s
5 VDDLP I/O
Backup the RTC from an external capacitor or a
battery (rechargeable or non-chargeable
).
6 GND Input Negative power (ground)