MM908E624ACEWSLASHR2 datasheet(33/40 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

908E624

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 website www.freescale.com.

VSUP Terminals (VSUP1 and VSUP2)

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 (Electro Static

Discharge) it is 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 AGND)

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 it is

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 20 and Figure 21 show the recommendations on

schematics and layout level and Table 15 indicates

recommended external components and layout

considerations.

Figure 20. EMC/EMI recommendations

MM908E624

VREFL

VDDA

EVDD

VDD

EVSS

AGND

VSUP1

GND

VSUP

VREFH

VSSA

VSUP2

LIN

MM908E624ACEW/R2 Datasheet(PDF) 33 Page - Freescale Semiconductor, Inc

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