Led_Wwan; Wake_On_Wan - Quectel RM520N-GL Hardware Design

4.4.3. LED_WWAN#

The LED_WWAN# signal is used to indicate RF status of the module, and its sink current is up to 10 mA.
To reduce current consumption of the LED, a current-limited resistor must be placed in series with the
LED, as illustrated in the figure below. The LED is ON when the LED_WWAN# signal is at low level.
330 Ω
LED1
Table 22: Network Status Indications of LED_WWAN#
LED_WWAN# Level
Low Level (LED ON)
High Level (LED OFF)

4.4.4. WAKE_ON_WAN#

The WAKE_ON_WAN# is an open drain pin, which requires a pull-up resistor on the host. When a URC
returns, a 1 s low level pulse signal will be outputted to wake up the host.
Table 23: State of the WAKE_ON_WAN#
WAKE_ON_WAN# State
Outputs a one-second pulse signal at low
level
RM520N-GL_Hardware_Design
VCC(Typ. 3.7V)
R1
LED_WWAN #
Figure 22: LED_WWAN# Reference Circuit
Description
RF function is turned on
RF function is turned off if any of the following occurs:
⚫
The (U)SIM card is not powered.
⚫
W_DISABLE1# is at low level (airplane mode enabled).
⚫
AT+CFUN=4 (RF function disabled).
Module
2, 4
VCC
70,72,74
10
Module Operation Status
Call/SMS/Data is incoming (to wake up the host)
5G Module Series
PMIC
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