Wwan_Led; Wake_On_Wan - Quectel RM502Q-GL Hardware Design

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4.5.3. WWAN_LED#

WWAN_LED# signal is used to indicate the 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 by the figure below. The LED is ON when the WWAN_LED# signal is at low level.

VCC(Typ. 3.7V)

330 Ω

LED1

The following table shows the RF status indicated by WWAN_LED#.

Table 23: Network Status Indications of WWAN_LED#

WWAN_LED# Logic Level

Low (LED on)

High (LED off)

The WAKE_ON_WAN# is an open drain pin, which requires a pull-up resistor on the host. When a URC

returns, a one-second low level pulse signal will be outputted to wake up the host.

RM502Q-GL_Hardware_Design

VCC

WWAN_LED#

Figure 25: WWAN_LED# 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 voltage level (airplane mode enabled).

⚫

AT+CFUN=4 (RF function disabled).

RM502Q-GL Hardware Design

Module

2, 4

70,72,74

PMIC

5G Module Series

51 / 83

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