Hardware Development Guide of Module Product
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3.12.2
Interface Application
The LGA module has three PINs to control the LED indicator, used to indicate the
network connection status. The different modes of status indicator flashing indicate
different network statuses. All the three PINs use the current sink type of current
source for control, which connects to the negative end of LED and connects to
VPH_PWR externally, to directly drive LED. Figure 3-12 is the reference circuit
design diagram. The flashing of indicator is controlled by the switch of RF, and the
LED PIN transmits the control signal to the external. The indicator status is as
defined in Table 3-12. If the RF control is not needed, the AP server can design the
status of control indicator by itself.
Figure 3-12 Reference Circuit of Status Indicator
Table 3-12 Definition of Indicator Status
Indicator Status
Module Working Status
RED indicator
always on
Not registered to the network
GREEN indicator
always on
Have been registered to 2G
network
GREEN indicator
flashing
Have been registered to 2G
network, and there is data service
as well.
BLUE indicator
always on
Have been registered to 3G
network
BLUE indicator
flashing
Have been registered to 3G
network, and there is data service
as well.
