Product Info

LTE Standard Module Series
EC21 Hardware Design
EC21_Hardware_Design 66 / 120
3.17. Network Status Indication
The network indication pins can be used to drive network status indication LEDs. The module provides
two pins which are NET_MODE and NET_STATUS. The following tables describe the pin definition and
logic level changes in different network status.
Table 20: Pin Definition of Network Connection Status/Activity Indicator
Pin Name Pin No. I/O Description Comment
NET_MODE 5 DO
Indicate the module’s network registration
mode
1.8V power domain.
Cannot be pulled up
before startup
NET_STATUS 6 DO
Indicate the module’s network activity
status
1.8V power domain
Table 21: Working State of Network Connection Status/Activity Indicator
Pin Name Logic Level Changes Network Status
NET_MODE
Always High Registered on LTE network
Always Low Others
NET_STATUS
Flicker slowly (200ms High/1800ms Low) Network searching
Flicker slowly (1800ms High/200ms Low) Idle
Flicker quickly (125ms High/125ms Low) Data transfer is ongoing
Always High Voice calling
A reference circuit is shown in the following figure.