LN920 HW Design Guide
1VV0301730 Rev. 1
Page 46 of 81
2021-08-11
Not Subject to NDA
26
GPS_DISABLE#
I
GPS disable
Internal VBATT
pull-up
23
WOW#
O
Wake the
plaform by the
WWAN device
Open-drain
10
WWAN_LED#
O
LED control
Open-drain
WWAN_LED# signal drives the LED output to display network registration state. The
recommended LED connection is the following:
R1 and VDD determine the brightness of LED and forward current.
When VDD is 3.3V and LED’s forward voltage is 2.0V, it is recommended to use the value
of R1 from 66 ohm to 250 Ohm.
However, the resistor value must be calculated considering LED characteristics.
Note:
If WWAN LED function is enabled by means of the
AT#WWANLED command and the LED is connected to the LED_N
pin, current consumption is increased.
6.5.4.
General Purpose I/O
The general-purpose I/O pins can be configured to operate in three different ways:
•
Input
•
Output
•
Dedicate Function (Customer Requirement)
