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Systèmes élec. & informatiques (MESISI120424)

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Le circuit ci-dessous est alimenté avec un signal PWM (e(t) est un signal PWM) on peut récupérer la tension moyenne du signal :

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Dans un montage Arduino, on effectue les connexions sur le 74HC4051 suivantes :

  • S0 est reliée à une broche numérique et reçoit un niveau logique HIGH

  • S1 est reliée à une broche numérique et reçoit un niveau logique LOW

  • S2 est reliée à la masse (GND)

  • E est reliée à la masse (GND)

Quel canal est connecté à Z ?

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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 external

clock 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.

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Comment peut-on utiliser le composant 74HC393 pour compter jusqu'à 255?

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Quelle est la formule pour calculer la température en degrés Celsius à partir de la tension de sortie du TMP36 ?

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74HC74, quelle affirmation est fausse ?

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Comment peut-on utiliser le composant 74HC393 pour compter jusqu'à 255?

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Soit le circuit suivant:

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on peut générer un signal PWM sur la broche:

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The 74HC74 is dual positive edge triggered D-type flip-flop. They have individual data (nD), clock (nCP), set (nSD) and reset (nRD) inputs, and complementary nQ and nQ outputs. Data at the nD-input, that meets the set-up and hold time requirements on the LOW-to-HIGH clock transition, is stored in the flip-flop and appears at the nQ output.

Quelle affirmation est fausse?

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