FXMA2102L8X datasheet(8/16 Pages) FAIRCHILD

Part #	FXMA2102L8X

Description	Dual Supply, 2-Bit Voltage Translator / Buffer / Repeater / Isolator for I2C Applications

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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FXMA2102 • Rev. 1.0.5

8

I

2C-Bus® Isolation

The FXMA2102 supports I

2C-Bus isolation for the

following conditions:

 Bus isolation if bus clear

 Bus isolation if either V

CC goes to ground

Bus Clear

Because the I

2C specification defines the minimum SCL

frequency of DC, the SCL signal can be held LOW

forever; however, this condition shuts down the I

2C bus.

The I

2C specification refers to this condition as “Bus

Clear”. In Figure 7, if slave #2 holds down SCL forever,

the master and slave #1 are not able to communicate,

because the FXMA2102 passes the SCL stuck-LOW

condition from slave #2 to slave #1 as well as the

master. However, if the OE pin is pulled LOW

(disabled), both ports (A and B) are 3-stated. This

results in the FXMA2102 isolating slave #2 from the

master and slave #1, allowing full communication

between the master and slave #1.

Either VCC to GND

If slave #2 is a camera that is suddenly removed from

the I

2C bus, resulting in V

CCB transitioning from a valid

VCC (1.65 V – 5.5 V) to 0 V, the FXMA2102

automatically forces SCL and SDA on both its A and B

ports into 3-state. Once VCCB has reached 0V, full I

2C

communication between the master and slave #1

remains undisturbed.

Figure 7. Bus Isolation

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