Wwan_Led# Signal; Wake_On_Wan# Signal - Quectel EM12-G Hardware Design

3.10.2. WWAN_LED# Signal

The WWAN_LED# signal is used to indicate the RF status of the module, and its typical current
consumption is up to 40mA.
In order to reduce the current consumption of the LED, a resistor must be placed in series with the LED,
as illustrated in the figure below. The LED is ON when the WWAN_LED# signal is at a low voltage level.
Figure 20: WWAN_LED# Signal Reference Circuit Diagram
The following table shows the RF status indicated by WWAN_LED# signal.
Table 13: Network Status Indications of WWAN_LED# Signal
WWAN_LED# Level
Low Level (LED ON)
High Level (LED OFF)

3.10.3. WAKE_ON_WAN# Signal

The WAKE_ON_WAN# signal is an open collector signal, which requires a pull-up resistor on the host.
When a URC returns, a 1s low level pulse signal will be outputted to wake up the host. The module
operation status indicated by WAKE_ON_WAN# is shown as below.
Table 14: State of the WAKE_ON_WAN# Signal
WAKE_ON_WAN# State
Output a 1s low level pulse signal
Always at high level
EM12-G_Hardware_Design
Description
RF function is turned on
RF function is turned off if any of the following circumstances occurs:

The (U)SIM card is not powered

W_DISABLE1# signal is at low level (airplane mode enabled).

AT+CFUN=4 (RF function disabled)
Module Operation Status
Call/SMS/Data is incoming (to wake up the host)
Idle/Sleep
LTE-A Module Series
EM12-G Hardware Design
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