LTE Standard Module Series
EC21 Mini PCIe Hardware Design
EC21_Mini_PCIe_Hardware_Design 22 / 67
1.
1)
The digital audio (PCM) function is only supported on
Telematics
version.
2. Keep all NC, reserved and unused pins unconnected.
3.1. Operating Modes
The following table briefly outlines the operating modes to be mentioned in the following chapters.
Table 5: Overview of Operating Modes
Mode
Details
Normal
Operation
Idle
Software is active. The module has registered on the network, and it is
ready to send and receive data.
Talk/Data
Network connection is ongoing. In this mode, the power consumption is
decided by network setting and data transfer rate.
Minimum
Functionality
Mode
AT+CFUN
command can set the module to a minimum functionality mode without
removing the power supply. In this case, both RF function and (U)SIM card will be
invalid.
Airplane Mode
AT+CFUN
command or W_DISABLE# pin can set the module to airplane mode. In
this case, RF function will be invalid.
Sleep Mode
In this mode, the current consumption of the module will be reduced to the minimal
level. In this mode, the module can still receive paging message, SMS, voice call and
TCP/UDP data from the network normally.
47
RESERVED
PCM_DOUT
1)
DO
PCM data output
48
1.5V
NC
Not connected
49
RESERVED
PCM_DIN
1)
DI
PCM data input
50
GND
GND
Mini card ground
51
RESERVED
PCM_SYNC
1)
IO
PCM frame synchronization
52
3.3Vaux
VCC_3V3
PI
3.0V~3.6V, typically 3.3V
DC supply
NOTES