Specifications

25
It is recommended that the LED pad is operated with a pad voltage below 0.5V. In this
case, the pad can be thought of as a resistor, RON. The resistance together with the
external series resistor will set the current, ILED, in the LED. Value for the external series
resistance can be calculated from the Equation 1
ON
LED
F
LED
R
I
VVDD
R 


Equation 1: LED series resistor
Where V
F
is the forward voltage drop of the LED, I
LED
is the forward current of the LED and
R
ON
is the on resistance (typically 20 Ω) of the LED driver.