SIM340 Hardware Design
SIM340_HD_V3.09
18.03.2009
51
Figure 33: SIM340 Services as caller
3.16 Network status indication
The NETLIGHT on the board-to-board connector can be used to drive a network status indication
LED lamp. The working state of this pin is listed in following table:
Table
22
: Working state of the NETLIGHT
State
SIM340 function
Off
SIM340 is not running
64ms On/ 800ms Off
SIM340 does not find the network
64ms On/ 3000ms Off
SIM340 find the network
64ms On/ 300ms Off
GPRS communication
We provide a reference circuit for you, shown as following figure:
MO
DUL
E
300R
4.7K
47K
VBAT
NETLIGHT
Figure 34: Reference circuit of NETLIGHT