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TCA9543ADR Datasheet(PDF) 22 Page - Texas Instruments

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Part # TCA9543ADR
Description  TCA9543A Low Voltage 2-Channel I2C Bus Switch With Interrupt Logic And Reset
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TCA9543ADR Datasheet(HTML) 22 Page - Texas Instruments

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A0
A1
RESET
INT0
SD0
SC0
GND
VCC
SDA
SCL
INT
SC1
SD1
INT1
V
DPU0
VIA to Power Plane
Partial Power Plane
V
DPU1
V
DPUM
VIA to GND Plane (Inner Layer)
Polygonal
Copper Pour
V
CC
GND
By-pass/De-coupling
capacitors
GND
To I2C Master
LEGEND
TCA9543A
SCPS206A – MARCH 2014 – REVISED FEBRUARY 2015
www.ti.com
12 Layout
12.1 Layout Guidelines
For PCB layout of the TCA9543A, common PCB layout practices should be followed but additional concerns
related to high-speed data transfer such as matched impedances and differential pairs are not a concern for I2C
signal speeds. It is common to have a dedicated ground plane on an inner layer of the board and terminals that
are connected to ground should have a low-impedance path to the ground plane in the form of wide polygon
pours and multiple vias. By-pass and de-coupling capacitors are commonly used to control the voltage on the
VCC terminal, using a larger capacitor to provide additional power in the event of a short power supply glitch and
a smaller capacitor to filter out high-frequency ripple.
In an application where voltage translation is not required, all VDPUX voltages and VCC could be at the same
potential and a single copper plane can connect all of the pull-up resistors to the appropriate reference voltage.
In an application where voltage translation is required, VDPUM, VDPU0, and VDPU1, may all be on the same layer of
the board with split planes to isolate different voltage potentials.
To reduce the total I2C bus capacitance added by PCB parasitics, data lines (SCn, SDn and INTn) should be a
short as possible and the widths of the traces should also be minimized (e.g. 5-10 mils depending on copper
weight).
12.2 Layout Example
Figure 23. Layout Example
22
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Product Folder Links: TCA9543A


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