User's Manual

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H380-GL Hardware User Manual Page
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network registration after read SIM card information. When SIM_DETECT is at low level, the module
judges that SIM card has been removed, and then it does not read SIM card.
Note:
SIM_DETECT is high-active by default and can be switched to low-active by AT command.
Please refer to AT command manual for specific AT command.
3.5.4 USIM Design
SIM card circuit design shall meet EMC standard and ESD requirements and shall improve the
anti-interference capability, so as to ensure the stable operation of SIM card. In the design, the followings
shall be strictly complied with:

The layout of SIM card slot shall be as close as possible to the module and away from RF
antenna, DC/DC power supply, clock signal line and other strong interference sources;
 SIM card slot with metal shield shall be applied to improve the anti-interference capability;

The cable between the module and SIM card slot shall not be longer than 100mm, as redundant
cable will degrade the quality of signal;
 UIM_CLK and UIM_DATA signal shall be isolated by grounding protection, so as to avoid mutual
interference. If impossible, then a grounding protection shall be completed at least for SIM signal
as a group;
 The filter capacitor and ESD devices of SIM card signal line shall be placed close to SIM card
slot, and 22~33pF capacitance shall be chose for equivalent capacitance of ESD devices.
3.6 Status Indicator
H380 module provides 3 signals for displaying the operating state of the module, and the status indicator
pins are as below:
Pin
Pin Name
I/O
Reset Value
Pin Description
Type
10
LED1#
O
PD
System status LED, drain output
CMOS 3.3V
23
WOWWAN#
O
L
Module wakes up Host(AP) signal,
drain output
CMOS 3.3/1.8V
48
TX_BLANKING
O
PD
PA Blanking output, external GPS
control signal
CMOS 1.8V