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FXMA2104 Datasheet(PDF) 9 Page - ON Semiconductor

Part No. FXMA2104
Description  Dual-Supply, 4-Bit Voltage Translator / Buffer / Repeater / Isolator
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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FXMA2104 Datasheet(HTML) 9 Page - ON Semiconductor

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© 2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FXMA2104 • Rev. 1.0.1
8
I
2C Bus Isolation
The FXMA2104 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 6, if slave #2 holds down SCL forever,
the master and slave #1 are not able to communicate
because the FXMA2104 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 FXMA2104 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 (1.65V – 5.5V) to 0V; the FXMA2104 automatically
forces all I/Os 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 6. Bus Isolation
Master
FXMA 2104
I2C Buffer
Translator
SCL1
SDA1
Slave#2
SCL1
SDA1
Slave#1
SCL1
SDA 1
VCCB
VCCA
OE
OE: High Enable
Low Disable
VCCB :
1.65V – 5.5V VCC
Domain
VCCA :
1.65V – 5.5V VCC
Domain
Slave #3
SCL2
SDA 2
SCL2
SDA 2
GPIO3
SCL1
SDA1
VCC = 3.3V
VCC = 1.8V
SCL2
SCL2
SDA 2
SDA 2
VCC = 1.8V
VCC = 3.3V


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