
5G Module Series
RM502Q-GL Hardware Design
RM502Q-GL_Hardware_Design 42 / 77
Table 14: GNSS Function Status
A simple level shifter based on diodes is used on W_DISABLE1# pin and W_DISABLE2# pin which are
pulled up to a 1.8 V voltage in the module, as shown in the following figure. So the control signals (GPIO)
of the host device could be a 1.8 V or 3.3 V voltage level. W_DISABLE1# and W_DISABLE2# are active
low signals, and a reference circuit is shown as below.
Host
Module
W_DISABLE2#
W_DISABLE1#
BB
GPIO
GPIO
26
8
VDD 1.8V
Notes:
The voltage level of VCC_IO_HOST could be 1.8V or 3.3V typically.
R3
100k
R2
100k
R5
10k
VCC_IO_HOST
R6
10k
Figure 26: W_DISABLE1# and W_DISABLE2# Reference Circuit
3.10.3. WWAN_LED#*
The WWAN_LED# signal is used to indicate RF status of the module, and its sink current is up to 10 mA.
In order 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 WWAN_LED# signal is at low level.
W_DISABLE2# Level
AT Commands
GNSS Function Status
High Level
AT+QGPS=1
Enabled
High Level
AT+QGPSEND
Disabled
Low Level
AT+QGPS=1
Low Level
AT+QGPSEND