TCA6507_16 Datasheet, PDF (34/45 Pages) Texas Instruments – Low-Voltage 7-Bit I2C and SMBus LED Driver

TCA6507
SCPS164C – MAY 2007 – REVISED JANUARY 2016
11 Layout
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11.1 Layout Guidelines
For PCB layout of the TCA6507, common PCB layout practices must be followed, but additional concerns related
to high-speed data transfer, such as matched impedances and differential pairs, are not a concern for I²C signals
speeds. It is common to have a dedicated ground plane on an inner layer of the board, and pins that are
connected to ground must 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 pin,
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.
11.2 Layout Example
P1
0402 Cap
VCC
P5
SCL
P4
SDA
P3
EN
P2
P1
= Via to GND Plane
P0
Figure 30. RUE Layout Recommendation
34
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