Product Info

LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design
3-52
/ 105
Table 18: 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
Cannot be pulled up
before startup
NET_STATUS
6
DO
Indicate the module’s network activity
status
1.8V power domain
Table 19: 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.
Figure 26: Reference Circuit of the Network Indicator