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 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 17: Pin Definition of Network Connection Status/Activity Indicator
Pin Name
Pin No.
I/O
Description
Comment
NET_MODE
1)
5
DO
Indicate the
module’s network registration
status
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
Quectel
Confidential
