Wake# Signal - Quectel EC21 Mini PCIe Series Hardware Design

Figure 13: LED_WWAN# Signal Reference Circuit Diagram
There are two indication modes for LED_WWAN# signal to indicate network status, which can be
switched through following AT commands:

AT+QCFG="ledmode",0 (Default setting)

AT+QCFG="ledmode",2
The following tables show the detailed network status indications of the LED_WWAN# signal.
Table 14: Indications of Network Status (AT+QCFG="ledmode",0, Default Setting)
Pin Status
Flicker slowly (200ms Low/1800ms High)
Flicker slowly (1800ms Low/200ms High)
Flicker quickly (125ms Low/125ms High)
Always Low
Table 15: Indications of Network Status (AT+QCFG="ledmode",2)
Pin Status
Low Level (Light ON)
High-impedance (Light OFF)

3.8.6. WAKE# Signal

The WAKE# signal is an open collector signal which is similar to RI signal, but a host pull-up resistor and
AT+QCFG="risignaltype","physical" command are required. When a URC returns, a 120ms low level
pulse will be outputted. The state of WAKE# signal is shown as below.
EC21_Mini_PCIe_Hardware_Design
LED_WWAN#
EC21 Mini PCIe Hardware Design
R
Description
Network searching
Idle
Data transfer is ongoing
Voice calling
Description
Registered on network successfully

No network coverage or not registered

W_DISABLE# signal is at low level. (Disable the RF)

AT+CFUN=0, AT+CFUN=4
LTE Standard Module Series
VCC
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