參數(shù)資料
型號: MM908E621ACDWB/R2
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO54
封裝: 17.90 X 7.50 MM, 0.65 MM PITCH, PLASTIC, SOIC-54
文件頁數(shù): 53/65頁
文件大?。?/td> 1221K
代理商: MM908E621ACDWB/R2
Analog Integrated Circuit Device Data
Freescale Semiconductor
57
908E621
TYPICAL APPLICATIONS
Figure 33. PCB Layout Recommendations
.
1
2
4
3
5
6
7
8
9
11
10
12
13
14
15
16
18
17
19
20
21
22
23
25
24
26
27
54
53
51
52
50
49
48
47
46
44
45
43
42
41
40
39
37
38
36
35
34
33
32
30
31
29
28
908E621
D1
LIN
VBAT
GND3
GND4
VSUP3
VSUP4
VSUP5
VSUP6
C3
C4
GND
V1
C5
C1
C2
L1
EVDD
EVSS
VDDA/VREFH
VSSA/VREFL
VDD
GND1
VSS
VSUP1
LIN
GND2
VSUP2
VSUP7
VSUP8
Table 21. Component Value Recommendation
Component
Recommended Value(1)
Comments / Signal routing
D1
reverse battery protection
C1
Bulk Capacitor
C2
100nF, SMD Ceramic, Low ESR
Close to VSUP pins with good ground return
C3
100nF, SMD Ceramic, Low ESR
Close (<3mm) to digital supply pins (EVDD, EVSS) with good ground
return.
The positive analog (VREFH/ VDDA) and the digital (EVDD) supply
should be connected right at the C3.
C4
4,7
μF, SMD Ceramic, Low ESR
Bulk Capacitor
C5
180pF, SMD Ceramic, Low ESR
Close (<5mm) to LIN pin.
Total Capacitance on LIN has to be below 220pF.
(Ctotal = CLIN-Pin + C5 + CVaristor ~ 10pF + 180pF + 15pF)
V1(2)
Varistor Type TDK AVR-M1608C270MBAAB
Optional (close to LIN connector)
SMD Ferrite Bead Type TDK MMZ2012Y202B
Optional, (close to LIN connector)
Notes
1.
Freescale does not assume liability, endorse, or want components from external manufactures that are referenced in circuit drawings
or tables. While Freescale offers component recommendations in this configuration, it is the customer’s responsibility to validate their
application.
2.
Components are recommended to improve EMC and ESD performance.
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