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Reference Guide
*
The Flash LED can be disabled by the user when in Sleep mode in order to save power consumption. Refer to
the AT Commands Interface Guide at
LED using an AT command.
4.4.
Real Time Clock (RTC)
The USR3500 has implemented Real Time Clock for saving date and time when the
USR3500 is unplugged from the DC power supply through the DC power cable.
Table 29.
Real Time Clock Specifications
Item
Charging Time start from fully discharged to fully charged
RTC Time Period*
*
This RTC time period is measured when the RTC battery is fully charged before the modem is unplugged from
the DC power source.
*
This RTC time period is for temperature from -20°C to +60°C. Once the operating/storage temperature is
beyond this range, this time period is not guaranteed.
Caution:
When the modem is shipped out, the charging voltage of the RTC battery is not guaranteed. Once
the modem is on power, the RTC battery will start charging and the RTC feature can then be
resumed.
4.5.
Interrupt
An interrupt pin, INT1, is multiplexed with GPIO25 on pin 1 of the Microfit connector.
Additional interrupt pins are also available via the expansion card connector. Refer to
the following table for the list of available interrupt pins in the modem.
Table 30.
Available Interrupt Pins on the USR3500
Interface Location
Microfit connector
Expansion connector
http://www.usr.com/support/3500
Guaranteed
Not guaranteed
Pin Number
Signal Name
1
INT1
32
INT0
Rev 1.0
for more information on how to disable the Flash
Minimum
Typical
15 Hours
30 Hours
60 Hours
Multiplex
Notes
GPIO25
GPIO3
1/27/14
Signals and Indicators
Maximum
40
40
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