User's Guide

HE863 Family Hardware User Guide
1vv0300891 Rev.5
- 2011-03-18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights
Reserved. Page 73 of 89
the pads have a push-pull output and therefore the pull-up
resistor may be omitted.
12.4. Using the Alarm Output GPIO6
The GPIO6 pad, when configured as Alarm Output, is controlled
by the HE863 Family module and will rise when the alarm starts
and fall after the issue of a dedicated AT command.
This output can be used to power up the HE863 Family
controlling microcontroller or application at the alarm time,
giving you the possibility to program a timely system wake-up
to achieve some periodic actions and completely turn off
either the application or the HE863 Family during sleep
periods. This will dramatically reduce the sleep consumption
to few μA.
In battery-powered devices this feature will greatly improve
the autonomy of the device.
NOTE:
During RESET the line is set to HIGH logic level.
12.5. Indication of Network Service Availability
The STAT_LED pin status shows information on the network
service availability and Call status. In the HE863 Family
modules, the STAT_LED usually needs an external transistor to
drive an external LED. Because of the above, the status
indicated in the following table is reversed with respect to
the pin status:
LED status Device Status
Permanently off Device off
Fast blinking
(Period 1s, Ton 0,5s)
Net search /
Not registered /
turning off
Slow blinking
(Period 3s, Ton 0,3s)
Registered full service
Permanently on a call is active