User manual

MTX-HSPA-PH8-P+G UMTS-HSPA terminal modem http://www.matrix.es
MTX-HSPA-PH8-P+G User Manual V.1.0 Pag. 21
Preliminary. Subject to change without prior notice
3.8 Real Time Clock
The MTX-HSPA-PH8-P+G contains a real time clock (RTC) to maintain accurate timekeeping and to enable
“time stamping” of messages.
The internal Real Time Clock of MTX-HSPA-PH8-P+G is supplied from a separate voltage regulator in the
analog controller which is also active when MTX-HSPA-PH8-P+G is in POWER DOWN status.
By default RTC is not powered when MTX-HSPA-PH8 is switched off.
Please contact [e-mail]
if RTC is a must in your application. You will need to install inside
an energy device like a battery or super-capacitor to provide back-up power to maintain the RTC.
Example: If using a 300mF supercap the RTC can be maintain for at least 12 hours.
Also, a battery (rechargeable or non-chargeable) can be used. The capacitor is charged by the BATT+ line
of internal PH8 module. If the voltage supply at BATT+ is disconnected, the RTC can be powered by the
capacitor.
The size of the capacitor determines the duration of buffering when no voltage is applied to the MTX-
HSPA-PH8-P+G, i.e. the larger the capacitor, the longer MTX-HSPA-PH8-P+G will save the date and time
for. A serial 1kΩ resistor placed on the board next to VDDLP limits the charge current of an empty
capacitor or battery.
The following figures show various sample configurations:
The MTX-HSPA-PH8-P+G can accommodate this battery or super-cap inside and the MTX-HSPA-PH8-P+G
can be ordered with this special option by request. Please contact your nearest sales distributor.
3.9. Software Updates
It is possible and sometimes necessary to update the MTX-HSPA-PH8-P+G software.
Updates must be carried out by an approved technician.
Please contact your supplier for details Service/Programming.