Smart Machine Smart Decision
SIM7200-PCIe_ Hardware_Design _V1.01
22
2016-05-19
Table 6: Recommended Zener diode
Vendor
Part number
Power (watts)
Package
1
On semi
MMSZ5231BT1G
500mW
SOD123
2
cj-elec
MMSZ5231B
500mW
SOD123
3
Prisemi
PZ3D4V2H
500mW
SOD323
4
Vishay
MMSZ4689-V
500mW
SOD123
5
Crownpo
CDZ55C5V1SM
500mW
0805
Table 7: Power and ground specifications
Pin Name
Pin No
Min
Type
Max
VCC
2, 39,41,52
3.2V
3.3V
3.6V
GND
4,9,15,18,21,26,27,29,
34,35,37,40,43,50
4.2
Power Saving Mode
SIM7200 has two power saving modes: minimum functionality mode and sleep mode. When SIM7200 is in sleep
mode and minimum functionality mode, the current consumption of module is lowest.
4.2.1.
Minimum Functionality Mode and Sleep Mode
The AT command “AT+CFUN=<fun>” can be used to set SIM7200 into minimum functionality.
There are three functionality modes, which could be set by the AT command “AT+CFUN=<fun>”. The command
provides the choice of the functionality levels <fun>=0, 1, 4.
AT+CFUN=0: Minimum functionality.
AT+CFUN=1: Full functionality (default).
AT+CFUN=4: Airplane mode (disable RF function).
Minimum functionality mode minimizes the current consumption to the lowest level. If SIM7200 is set to
minimum functionality by “AT+CFUN=0”, the RF function and USIM card function will be disabled. In this case,
the serial port and USB port are still accessible, but all AT commands correlative with RF function and USIM
card function will not be accessible.
Note: For detailed information about the AT Command “AT+CFUN=<fun>”, please refer to
document [1].
If host sends USB suspend request, SIM7200 will enter sleep mode automatically for reducing power
consumption, when peripheral equipment of SIM7200 stops working, and module has no on air or audio activity
required. In sleep mode, SIM7200 can still receive paging or SMS from network.
Note: SIM7200 could enter sleep mode if the host CPU supports USB suspend mode, otherwise it could not
enter sleep mode.
