User's Manual

H380 M.2 Series Module Hardware User Manual page
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 The SIM card signals should be protected by ESD component(low capacitance capacitor, such as
Zener diode). The recommended part no of ESD component is AVR-M1005C080MTAAB (TDK). ESD
component should layout with SIM connector closely.
5.5.4 USIM Hot Plug
H380 supports the detection function of SIM status,and this function can realize SIM hot plug.
5.5.4.1 Hardware Connection
SIM hot plug function need support of SIM_DETECT signal.
When no SIM card, SIM_DETECT is low level; insert SIM, SIM_DETECT is high level.
Explanation:
1) For normally closed SIM connector circuit, as shown in Figure 5-7.SIM_DETECT connects Pin8 (SW2)
of U2, Pin7 (SW1) short GND. When there is no SIM card, SW2 and SW1 short, SW2 is low level. When
SIM card inserted, SW1 and SW2 disconnect, SIM_DETECT is pulled high.
2) For normally open SIM connector circuit, as shown in Figure 5-8. SIM_DETECT connects Pin8 (SW2)
of U2, and it also be pulled low by 47K ohms resistor. Pin 7 is pulled high by 4.7K ohms resistor. When no
SIM card, SW2 and SW1 disconnect, SW2 is low. After SIM inserted, SW2 and SW1 short, SIM_DETECT
is pulled high.
5.5.4.2 Software Configuration
“+MSMPD” AT command control SIM card hot plug function on/off.
AT+MSMPD=0, SIM card hot plug deactivated. Module does not detect SIM_DETECT signal.
AT+MSMPD=1, SIM card hot plug activated. Module support SIM hot plug by SIM_DETECT pin
signal status.
SIM_DETECT High level, SIM card is present, module registers the network automatically.
SIM_DETECT Low level, SIM card is absent, module drops out the network.
Note: The “+MSMPD” default value is “1”. SIM_DETECT is only used for SIM card hot plug detection,
Module don’t detect SIM_DETECT signal at the first startup(it means the module will read SIM card data
and register network at the first startup, no matter pin SIM_DETECT is high or low).
5.6 Digital Audio
H380 M.2 supports digital audio I2S interface. It can support normal I2S mode or PCM mode. The
voltage level of I2S interface is 1.8V.
I2S signal description as listed below:
Pin # Name Type Description
20 I2S_CLK O Clocked