LED notes
Typical values for the LED series resistor value at various supply voltages are given in the table below.
Note: you may want to drive the LED at a current less than the max I_forward.
(+) ---[>|--- ---'\/\/\,--- (-)
Resistance for one LED at 3V/3.3V/5V/10V power supply:
| I_forward(mA) | V_forward(mA) | R(ohm)@ 3.0V | R(ohm)@ 3.3V | R(ohm)@ 5V | R(ohm)@ 12V |
|---|---|---|---|---|---|
| 2mA | 1.8V | 620 | 750 | 1.6k | 5.1k |
| 2mA | 2.1V | 470 | 620 | 1.5k | 5.1k |
| 5mA | 1.8V | 240 | 300 | 680 | 2.2k |
| 5mA | 2.1V | 180 | 240 | 620 | 2.0k |
| 10mA | 1.8V | 120 | 150 | 330 | 1.1k |
| 10mA | 2.1V | 91 | 120 | 300 | 1.0k |
| 20mA | 1.8V | 68 | 75 | 160 | 560 |
| 20mA | 2.1V | 47 | 62 | 150 | 510 |
