Installation Instructions

SIM5216A _HD_V1.02 Hardware Design
SIM5216A _HD_V1.02 26.08.2010
23
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 SIM5216A module to enter or exit the Flight mode in customer
applications. In Flight mode, SIM5216A closes RF function. If GPIO4 is left open, SIM5216A
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
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), SIM5216A will enter SLEEP
mode automatically. In this mode, SIM5216A can still receive paging or SMS from network. If
USB interface of SIM5216A is connecting with host CPU,and host CPU support USB suspend
mode, SIM5216A could enter sleep mode. Otherwise SIM5216A could not enter sleep mode.
GPIO4 Status Module Action
Low Level Flight Mode: RF is closed.
High Level Normal Mode: RF is working.