UMTS/HSPA(+) Module Series
UC200T-EM Hardware Design
UC200T-EM_Hardware_Design 39 / 68
Table 18: Pin Definition of Network Connection Status/Activity Indicator
Table 19: Working State of the Network Connection Status/Activity Indicator
A reference circuit is shown in the following figure
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4.7K
47K
VBAT
2.2K
Module
Network
Indicator
Figure 17: Reference Circuit of the Network Indicator
Pin Name
Pin No.
I/O
Description
Comment
NET_MODE
5
DO
Indicate the module network
registration mode.
1.8V power domain
If unused, keep it open
NET_STATUS
6
DO
Indicate the module network
activity status.
1.8V power domain
If unused, keep it open
Pin Name
Logic Level Changes
Network Status
NET_MODE
Always High
Registered on UMTS 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