User's Manual

Smart Machine Smart Decision

SIM5320A_Hardware Design_V1.01 2011-2-29

Table 26: LED status

LED Status Module Status

Always On Searching Network/Call Connect

200ms ON, 200ms OFF Data Transmit

800ms ON, 800ms OFF Registered network

Off

Power off / Sleep

Flight mode control

GPIO4 controls SIM5320A module to enter or exit the Flight mode. In Flight mode, SIM5320A closes RF

function to prevent interference with other equipments or minimize current consumption. Bidirectional

ESD protection component is suggested to add on GPIO4.

Figure 32: Flight mode switch

Table 27: Control status

GPIO4 Status Module operation

Low Level Flight Mode: RF is closed.

High Level Normal Mode: RF is working.

Note

：

1. For SIM5320A, GPIO0, GPIO2, GPIO3 and GPIO5 have multiplex function, user can use them as PCM

interface to connect extend codec. Refer to section 3.10 and document [1] for details.

2. When the module is powered off, make sure all digital interfaces (PCM UART, etc) connected with peripheral devices

have no voltage higher than 0.3V. If users’ design cannot meet above conditions, high level voltages maybe occur in

GPIO pins because current leakage from above digital interfaces may occur.