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How the I2C Bus Works - EEWeb

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I 2 C Multiplexers: Multi-card Application<br />

- Cards are identical<br />

- One card is selected / controlled<br />

at a time<br />

- PCA9544 collects Interrupt<br />

MASTER<br />

INT<br />

PCA<br />

9544<br />

INT0<br />

INT1<br />

INT2<br />

INT3<br />

I 2 C bus 0<br />

I 2 C bus 1<br />

I 2 C bus 2<br />

I2 I C bus 3<br />

2C bus 3<br />

Interrupt signals are<br />

collected into one signal<br />

Card 0<br />

Card 1<br />

Card 2<br />

Card 3<br />

PCA<br />

9554<br />

Semiconductors 59<br />

INT<br />

0<br />

1<br />

1<br />

0<br />

0<br />

1<br />

Reset<br />

Reset<br />

Alarm 1<br />

Int<br />

Alarm 1<br />

Int<br />

Reset<br />

Sub<br />

System<br />

Int

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