User's Manual

LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design Confidential / Released 49 / 94
3.14. Network Status Indication
The network indication pins can be used to drive network status indicationLEDs. The module provides two
pins which are NET_MODE and NET_STATUS. The following tables describe thepin definition and logic
level changes in different network status.
Table 17: Pin Definition of Network ConnectionStatus/Activity Indicator
Pin Name Pin No. I/O Description Comment
NET_MODE
1)
5 DO
Indicate the module’s network
registrationstatus
1.8V power domain
NET_STATUS 6 DO
Indicate the module’s network activity
status
1)
means that this pin cannot be pulled up before startup.
Table 18: 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.
NOTE