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參數(shù)資料
| 型號： | 4559 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片4位微機的CMOS |
| 文件頁數(shù)： | 120/148頁 |
| 文件大?。?/td> | 1732K |
| 代理商： | 4559 |
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Rev.1.04
Aug 23, 2007
Page 73 of 146
REJ03B0188-0104
4559 Group
(2) Connection of bypass capacitor across VSS line
and VDD line
Connect an approximately 0.1
F bypass capacitor across the
VSS line and the VDD line as follows:
Connect a bypass capacitor across the VSS pin and the VDD pin
at equal length.
Connect a bypass capacitor across the VSS pin and the VDD pin
with the shortest possible wiring.
Use lines with a larger diameter than other signal lines for VSS
line and VDD line.
Connect the power source wiring via a bypass capacitor to the
VSS pin and the VDD pin.
Fig 77. Bypass capacitor across the VSS line and the
VDD line
(3) Oscillator concerns
Take care to prevent an oscillator that generates clocks for a
microcomputer operation from being affected by other signals.
(1) Keeping oscillator away from large current signal lines
Install a microcomputer (and especially an oscillator) as far
as possible from signal lines where a current larger than the
tolerance of current value flows.
Reason
In the system using a microcomputer, there are signal lines for
controlling motors, LEDs, and thermal heads or others. When
a large current flows through those signal lines, strong noise
occurs because of mutual inductance.
Fig 78. Wiring for a large current signal line
(2) Installing oscillator away from signal lines where potential
levels change frequently
Install an oscillator and a connecting pattern of an oscillator
away from signal lines where potential levels change
frequently. Also, do not cross such signal lines over the
clock lines or the signal lines which are sensitive to noise.
Reason
Signal lines where potential levels change frequently (such as
the CNTR pin signal line) may affect other lines at signal
rising edge or falling edge. If such lines cross over a clock line,
clock waveforms may be deformed, which causes a
microcomputer failure or a program runaway.
Fig 79. Wiring to a signal line where potential levels
change frequently
(3) Oscillator protection using VSS pattern
As for a two-sided printed circuit board, print a VSS pattern
on the underside (soldering side) of the position (on the
component side) where an oscillator is mounted.
Connect the VSS pattern to the microcomputer VSS pin with
the shortest possible wiring.
Besides, separate this VSS pattern from other VSS patterns.
Fig 80. VSS pattern on the underside of an oscillator
VSS
VDD
VSS
VDD
N.G.
O.K.
XIN
XOUT
VSS
M
Microcomputer
Mutual inductance
Large
current
GND
XIN
XOUT
VSS
CNTR
Do not cross
N.G.
Oscillator wiring
pattern example
An example of VSS patterns on the
underside of a printed circuit board
Separate the VSS line for oscillation from other VSS lines
XIN
XOUT
VSS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 456700000 | Terminal Block; Leaded Process Compatible:Yes |
| 457000000 | Cross Connector; Number of Positions:10; Current Rating:24 VA |
| 45714-0003 | Edge Connector,PCB Mnt,RECEPT,8 Contacts,0.507 Pitch,COMPLIANT FIT Terminal,GUIDE SLOT |
| 45714-0001 | Card Edge Connector; No. of Contacts:4; Pitch Spacing:0.508"; Contact Termination:Press-Fit; Body Material:LCP Liquid Crystal Polymer, Glass-filled; Mounting Type:Through Hole; Series:45714; Color:Black; Voltage Rating:250V RoHS Compliant: Yes |
| 45714-0002 | Card Edge Connector; No. of Contacts:6; Pitch Spacing:0.508"; Contact Termination:Press-Fit; Body Material:LCP Liquid Crystal Polymer, Glass-filled; Mounting Type:Through Hole; Series:45714; Color:Black; Voltage Rating:250V RoHS Compliant: Yes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 4559_08 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Standard Characteristics |
| 45-590 | 制造商:GC Electronics 功能描述:Conn D-Subminiature Adapter F/F 9/15 POS ST 1 Port |
| 45-590 4/PK | 功能描述:電纜組件 DB-9F DB-15F HI DEN RoHS:否 制造商:Molex 產(chǎn)品:Power Assemblies 類型:Cable Assembly 連接器端口 A:No Connector 連接器端口 A 管腳計數(shù):4 連接器端口 B:No Connector 連接器端口 B 管腳計數(shù): 型式:Male 線規(guī) - 美國線規(guī)（AWG）:20, 28 長度:0.305 m 顏色:Black, Red |
| 4-5-5906 | 功能描述:TAPE 5906 VHB FOAM 4" X 5YD 制造商:3m (tc) 系列:* 零件狀態(tài):有效 標(biāo)準(zhǔn)包裝:1 |
| 4-5-5907 | 功能描述:TAPE 5907 VHB FOAM 4" X 5YD 制造商:3m (tc) 系列:* 零件狀態(tài):有效 標(biāo)準(zhǔn)包裝:1 |
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