FN990
Family Hardware Design Guide
1VV0301752 Rev. 3 Page 53 of 92 2022-10-07
Not Sub
ect to NDA
High or Floating: Normal operation
Figure 15: Example Circuit for WLAN/GNSS Disable Function
Please refer to the AT commands guide for setting the WLAN/GNSS disable function.
6.3.5.2. LED
The LED signal drives the LED output. The recommended LED connection is the following:
Figure 16: Recommended LED Connection
R1 and VDD determine the LED brightness and forward current.
When VDD is 3.3V and LED’s forward voltage is 2.0V, the recommended R1 value ranges
from 66 to 250 Ohm.
However, the resistor value must be calculated considering the LED specifications. It is
recommended to use VDD below VPH_PWR level.
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