908E621_07 Datasheet, PDF (55/62 Pages) Freescale Semiconductor, Inc – Integrated Quad Half-Bridge and Triple High-Side with Embedded MCU and LIN for High End Mirror

TYPICAL APPLICATIONS
EMC/EMI RECOMMENDATIONS
This paragraph gives some device specific
recommendations to improve EMC/EMI performance.
Further generic design recommendations can be e.g. found
on the Freescale web site www.freescale.com.
VSUP terminals (VSUP[1:8])
Its recommended to place a high quality ceramic
decoupling capacitor close to the VSUP terminals to improve
EMC/EMI behavior.
LIN terminal
For DPI (Direct Power Injection) and ESD (Electrostatic
Discharge) its recommended to place a high quality ceramic
decoupling capacitor near the LIN terminal. An additional
varistor will further increase the immunity against ESD. A
ferrite in the LIN line will suppress some of the noise induced.
Voltage regulator output terminals (VDD and VSS)
Use a high quality ceramic decoupling capacitor to
stabilize the regulated voltage.
MCU digital supply terminals (EVDD and EVSS)
Fast signal transitions on MCU terminals place high, short-
duration current demands on the power supply. To prevent
noise problems, take special care to provide power supply
bypassing at the MCU. It is recommended that a high quality
ceramic decoupling capacitor be placed between these
terminals.
MCU analog supply terminals (VREFH/VDDA and VREFL/
VSSA)
To avoid noise on the analog supply terminals, its
important to take special care on the layout. The MCU digital
and analog supplies should be tied to the same potential via
separate traces and connected to the voltage regulator
output.
Figure 32 and Figure 33 show the recommendations on
schematics and layout level and Table 23 indicates
recommended external components and layout
considerations.
VSUP
D1
+
C1
C2
VSUP[1:8]
VDD
VSS
L1
LIN
V1
LIN
C5
VDDA/VREFH
EVDD
C3
C4
GND[1:4]
MM908E621
EVSS
VSSA/VREFL
Figure 32. EMC/EMI recommendations
Analog Integrated Circuit Device Data
Freescale Semiconductor
908E621
55