Revision as of 00:46, 30 September 2014

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)

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 : VF = 1.8V
- average current : I = 20mA

the datasheet of the orange LED (see pages 4 & 5) indicates that :
- conduction voltage : VF = 1.9V
- average current : I = 30mA

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 R_LED_R $\frac{R_LED_R}{I} = \frac{150 o}{10mA}$ = 15 mW

calculation of resistance R_LED_O $\frac{U_r}{I} = \frac{VDD - U_{LR}}{I} = \frac{3.3V - 1.9V}{10mA}$ = 140 ohm
power dispersed by the resistance R_LED_O $\frac{R_LED_O}{I} = \frac{140 o}{10mA}$ = 14 mW

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 === Formula ===
 * calculation of resistance R_LED_R <math>\frac{U_r}{I} = \frac{VDD - U_{LR}}{I} = \frac{3.3V - 1.8V}{10mA}</math> = ''' 150 ohm '''
+* power dispersed by the resistance R_LED_R <math>\frac{R_LED_R}{I} = \frac{150 o}{10mA}</math> = ''' 15 mW '''
 * calculation of resistance R_LED_O <math>\frac{U_r}{I} = \frac{VDD - U_{LR}}{I} = \frac{3.3V - 1.9V}{10mA}</math> = ''' 140 ohm '''
+* power dispersed by the resistance R_LED_O <math>\frac{R_LED_O}{I} = \frac{140 o}{10mA}</math> = ''' 14 mW '''
 = Layout =