Difference between revisions of "Extension Explorer 16"
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** average current : I = 30mA | ** average current : I = 30mA | ||
=== Formula === | === Formula === | ||
− | * calculation of resistance R_LED_R | + | * calculation of resistance R_LED_R : |
− | + | <code>$\frac{U_r}{I} = \frac{VDD - U_{LR}}{I} = \frac{3.3V - 1.8V}{10mA} = ''' 150 ohm '''$</code> | |
− | < | + | * power dispersed by the resistance P_R_LED_R : |
− | + | <code>$<math>\frac{R_LED_R^{2}}{I} = \frac{150 o ^{2}}{10mA}</math> = ''' 15 mW ''' $</code> | |
− | + | ||
− | + | ||
− | * power dispersed by the resistance | + | |
− | * calculation of resistance R_LED_O <math>\frac{U_r}{I} = \frac{VDD - U_{LO}}{I} = \frac{3.3V - 1.9V}{10mA}</math> = ''' 140 ohm ''' | + | * calculation of resistance R_LED_O : |
− | * power dispersed by the resistance | + | <code>$<math>\frac{U_r}{I} = \frac{VDD - U_{LO}}{I} = \frac{3.3V - 1.9V}{10mA}</math> = ''' 140 ohm ''' $</code> |
+ | * power dispersed by the resistance P_R_LED_O : | ||
+ | <code>$<math>\frac{R_LED_O^{2}}{I} = \frac{140 o ^{2}}{10mA}</math> = ''' 14 mW ''' $</code> | ||
− | * calculation of resistance R_LED_G <math>\frac{U_r}{I} = \frac{VDD - U_{LG}}{I} = \frac{3.3V - 2.2V}{10mA}</math> = ''' 110 ohm ''' | + | * calculation of resistance R_LED_G : |
− | * power dispersed by the resistance | + | <code>$<math>\frac{U_r}{I} = \frac{VDD - U_{LG}}{I} = \frac{3.3V - 2.2V}{10mA}</math> = ''' 110 ohm '''$</code> |
+ | * power dispersed by the resistance P_R_LED_G : | ||
+ | <code>$<math>\frac{R_LED_G^{2}}{I} = \frac{110 o ^{2}}{10mA}</math> = ''' 11 mW '''$</code> | ||
= Layout = | = Layout = |
Revision as of 01:27, 30 September 2014
Contents
[hide]Description
In French: Création d'une carte d'extension pour la carte Explorer (PROJET: Carte Explorer 16 & Exos sur les uC).
- V1: un montage permettra de simuler un carrefour routier, composer de 4 feux (RGB)
in English:
creation of one extansion board for the Explorer Board (see the links above)
- V1: assembly will allow to simulate a crossroad (4 fires (RGB))
Digram - Schematic
Part Calculation of Electronics Digram
LED's for crossroad
- the datasheet of the DSP implemented on the Explorer Board 16 (see pages 1 & 273) indicates that :
- output current of I/O : I = 10mA
- voltage I/O : VDD = 3.3V
- the datasheet of the red LED (see pages 3) indicates that :
- conduction voltage : ULR = VF = 1.8V
- average current : I = 20mA
- the datasheet of the orange LED (see pages 3 / 4 / 5) indicates that :
- conduction voltage : ULO = VF = 1.9V
- average current : I = 30mA
- the datasheet of the green LED (see pages 3 / 4 / 5) indicates that :
- conduction voltage : ULG = VF = 2.2V
- average current : I = 30mA
Formula
- calculation of resistance R_LED_R :
$\frac{U_r}{I} = \frac{VDD - U_{LR}}{I} = \frac{3.3V - 1.8V}{10mA} = 150 ohm $
- power dispersed by the resistance P_R_LED_R :
$
= 15 mW $
- calculation of resistance R_LED_O :
$
= 140 ohm $
- power dispersed by the resistance P_R_LED_O :
$
= 14 mW $
- calculation of resistance R_LED_G :
$
= 110 ohm $
- power dispersed by the resistance P_R_LED_G :
$
= 11 mW $
Layout
Components listing
Modification
Documentation
PDF FILE
- datasheet on the RED LED - AVAGO File:LED RED.pdf