参数资料
型号: MM908E626AVEK
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: FLASH, 32 MHz, MICROCONTROLLER, PDSO54
封装: 5.10 X 10.30 MM, 0.65 MM PITCH, LEAD FREE, SOIC-54
文件页数: 28/43页
文件大小: 842K
代理商: MM908E626AVEK
Analog Integrated Circuit Device Data
34
Freescale Semiconductor
908E626
TYPICAL APPLICATIONS
EMC/EMI RECOMMENDATIONS
This paragraph gives some device specific
recommendations to improve EMC/EMI performance.
Further generic design recommendations can be found on
the Freescale web site, www.freescale.com.
VSUP Pins (VSUP1:VSUP3)
Its recommended to place a high quality ceramic
decoupling capacitor close to the VSUP pins to improve
EMC/EMI behavior.
LIN Pin
For DPI (Direct Power Injection) and ESD (Electrostatic
Discharge) its recommended to place a high quality ceramic
decoupling capacitor near the LIN pin. 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 Pins (VDD and AGND)
Use a high quality ceramic decoupling capacitor to
stabilize the regulated voltage.
MCU digital supply pins (EVDD and EVSS)
Fast signal transitions on MCU pins 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 pins.
MCU analog supply pins (VREFH, VDDA, VREFL, and
VSSA)
To avoid noise on the analog supply pins 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 18 and Figure 19 show the recommendations on
schematics and layout level and Table 11 indicates
recommended external components and layout
considerations.
Figure 18. EMC/EMI Recommendations
MM908E625
VREFL
VDDA
EVDD
VDD
EVSS
VSS
VSUP1
GND1
VSUP
+
VREFH
VSSA
VSUP2
LIN
C1
C2
D1
C3
C4
C5
L1
V1
VSUP3
GND2
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