Telit Wireless Solutions CE910-DC, Hardware User'S Manual

Page: 51 / 67

The GPIO pads, when used as outputs, can drive 1.8V CMOS digital devices or compatible hardware.
When set as outputs, the pads have a push-pull output and therefore the pull-up resistor may be
omitted.
The STAT_LED pin status shows information on the network service availability and Call status. In
the CE910 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
A schematic example could be: