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PI4MSD5V9543BLE Datasheet(PDF) 9 Page - Pericom Semiconductor Corporation

Part # PI4MSD5V9543BLE
Description  2 Channel I2C bus switch
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Manufacturer  PERICOM [Pericom Semiconductor Corporation]
Direct Link  http://www.pericom.com
Logo PERICOM - Pericom Semiconductor Corporation

PI4MSD5V9543BLE Datasheet(HTML) 9 Page - Pericom Semiconductor Corporation

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2015-07-0038
PT0535-4
8/18/15
9
PI4MSD5V9543B
2 Channel I2C bus switch
with Interrupt Logic and Reset
Voltage translation
The pass gate transistors of the PI4MSD5V9543B are constructed such that the VCC voltage can be used to limit
the maximum voltage that is passed from one I2C-bus to another.
Figure 6:Vpass voltage VS Vcc
Figure 6 shows the voltage characteristics of the pass gate transistors (note that the graph was generated using the
data specified in Section “DC Electrical characteristics” of this data sheet).
In order for the PI4MSD5V9543B to act as a voltage translator, the Vpass voltage should be equal to, or lower
than the lowest bus voltage. For example, if the main bus was running at 5 V, and the downstream buses were 3.3 V
and 2.7 V, then Vpass should be equal to or below 2.7 V to clamp the downstream bus voltages effectively.
Looking at Figure 6, we see that Vpass (max) is at 2.7 V when the PI4MSD5V9543B supply voltage is 3.5 V or
lower so the PI4MSD5V9543B supply voltage could be set to 3.3 V. Pull-up resistors can then be used to bring the bus
voltages to their appropriate levels
I2C BUS
The I2C-bus is for 2-way, 2-line communication between different ICs or modules. The two lines are a serial data
line (SDA) and a serial clock line (SCL). Both lines must be connected to a positive supply via a pull-up resistor when
connected to the output stages of a device. Data transfer may be initiated only when the bus is not busy.
One data bit is transferred during each clock pulse. The data on the SDA line must remain stable during the HIGH
period of the clock pulse as changes in the data line at this time are interpreted as control signals
Figure 7: Bit Transfer


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