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Systèmes élec. & informatiques (MESISI120424)
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Quelle est la formule pour calculer la température en degrés Celsius à partir de la tension de sortie du TMP36 ?
74HC393, quelle (es) affirmation (s) est fausse (s) ?
The 74HC/HCT393 are 4-bit binary ripple counters with separate clocks (1CP and 2 CP) and master reset (1MR and 2MR) inputs to each counter. The operation of each half of the "393" is the same as the "93" except no externalclock connections are required.The counters are triggered by a HIGH-to-LOW transition of the clock inputs. The counter outputs are internally connected to provide clock inputs to succeeding stages.
Ce code permet de générer un signal PWM dont le rapport cyclique en % est de: ( donner la valeur numerique en %)
Soit le sketch ci dessous:
Que vaut la distance (en mm) entre l'obstacle et et le capteur ultrason de distance HSR04
74HC393, quelle(es) affirmation (s) est vraie (s)?
The master resets are active-HIGH asynchronous inputs to each 4-bit counter identified by the "1" and "2" in the pin description.A HIGH level on the nMR input overrides the clock and sets the outputs LOW.
Comment peut-on limiter le compteur 74HC393 à compter uniquement de 0 à 3, puis le faire recommencer automatiquement ?
74HC393, quelle (es) affirmation (s) est fausse (s) ?
The 74HC/HCT393 are 4-bit binary ripple counters with separate clocks (1CP and 2 CP) and master reset (1MR and 2MR) inputs to each counter. The operation of each half of the "393" is the same as the "93" except no externalclock connections are required.The counters are triggered by a HIGH-to-LOW transition of the clock inputs. The counter outputs are internally connected to provide clock inputs to succeeding stages.
74HC74, quelle affirmation est fausse ?
74HC393, quelle(es) affirmation (s) est vraie (s)?
The master resets are active-HIGH asynchronous inputs to each 4-bit counter identified by the "1" and "2" in the pin description.A HIGH level on the nMR input overrides the clock and sets the outputs LOW.
Le circuit ci-dessous est alimenté avec un signal PWM (e(t) est un signal PWM) on peut récupérer la tension moyenne du signal :