SIM5218E Hardware Design
“AT+CFUN”, it can return to full functionality by “AT+CFUN”.
NOTE: In fact, Flight mode is identical with minimum functionality mode .Different titles lie
on different viewpoint. Flight mode is titled from visual application; however, minimum
functionality is derived from normal 3GPP at-command spec.
3.5.2 Flight mode
Through GPIO4 signal control SIM5218E module to enter or exit the Flight mode in customer
applications. In Flight mode, SIM5218E closes RF function. If GPIO4 is left open, SIM5218E
enters normal mode. But it is suggested that GPIO4 should not be left open. Because GPIO4 is
sensitive to ESD, so bidirectional ESD protection component is suggested to add on GPIO4.
Figure 7: flight mode switch
Table 7
：
logic of flight mode switch
GPIO4 Status
Module Action
Low Level
Flight Mode: RF is closed.
High Level
Normal Mode: RF is working.
3.5.3 Sleep Mode
If periphery equipment stops working, and there is no on air or audio activity required and no
hardware interrupt (such as GPIO interrupt or data on serial port), SIM5218E will enter SLEEP
mode automatically. In this mode, SIM5218E can still receive paging or SMS from network.
NOTE:
1. If USB interface of SIM5218E is connected with a host CPU , and host CPU support USB
suspend mode, SIM5218E could enter sleep mode. Otherwise SIM5218E could not enter sleep
mode.
2. SIM5218E can enter sleep mode when module detect RXD being low level. If UART interface
SIM5218E_ Hardware Design_V1.06
2012.09.21
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Содержание SimCom SIM5218E
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