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| 型號(hào)： | LC651306A |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | 4-Bit Single-Chip Microcontroller for Small-Scale Control Applications(用于小規(guī)?？刂茟?yīng)用的單片4位微控制器) |
| 中文描述： | 4位單片機(jī)的小規(guī)模控制中的應(yīng)用（用于小規(guī)模控制應(yīng)用的單片4位微控制器） |
| 文件頁(yè)數(shù)： | 19/21頁(yè) |
| 文件大?。?/td> | 698K |
| 代理商： | LC651306A |
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LC651306A/04A/02A/01A
19/21
Notes on Circuit Board Design
This section provides advice and countermeasures to prevent microcontroller noise problem when designing circuit boards
using these microcontrollers intended for a mass production. These design techniques are effective to prevent and avoid the
defects (e.g. malfunctions of the microcontroller or a runaway program) caused by noise.
1. VDD, VSS : Power Supply Pins
Add capacitors between the VDD and VSS pins so that they meet the following conditions.
The VDD line and the VSS line to the two capacitors (C1 and C2) should be as similar in length as possible (L1=L1’,
L2=L2’), and should be as short as possible.
Add the larger capacitor to ‘C1’ position and smaller capacitor to ‘C2’ position.
The VDD and VSS lines on the circuit board should be thicker than any other lines.
2. OSC1, OSC2: Clock I/O Pins
When the ceramic resonator option is selected: (Figure 2-1)
The length of the lines (Losc in Fig.2-1) between the clock I/O
pins (input: OSC1, output: OSC2) and the external components
should be as short as possible.
The length of the lines (Lvss+L1 or L2 ) between each capacitor
and the VSS pin should be as short as possible.
The VSS line for the oscillation circuit and the VSS line for
other functions should be branched as close as possible to the
microcontroller's VSS pin.
Oscillation constants written in this specification sheet (such as
the capacitor C1, C2 and the damping resistor Rd) may have to
be changed and the frequency should be adjusted, depending
on the pattern capacity of the circuit board. For further information,
contact the oscillator manufacturer
When two-pin RC oscillator option is selected: (Figure 2-2)
The length of the lines (Losc) between the clock I/O pins (input:
OSC1, output: OSC2) and the external components (capacitor
Cext, resistor Rext) should be as short as possible.
The length of the line (Lvss+Lc) between the capacitor and the
VSS pin should be as short as possible.
The VSS line for the oscillation circuit and the VSS line for
other functions should be branched as close as possible to the
microcontroller's VSS pin.
When the external oscillation option is selected: (Figure 2-3)
The length of the line (Losc) between the clock input pin (OSC1)
and the external oscillator should be as short as possible.
The clock output pin (OSC2) should be opened.
The length of the line between the VSS and the external
oscillator, and the length of the line between the VDD and
the external oscillator should be as short as possible.
VDD
VSS
C1
C2
L2
L1
L1'
L2
'
+
OSC1
OSC2
VSS
Lvss
L
L
Figure 2-1. Sample Oscillation Circuit 1
(Ceramic resonator)
Losc
C1
C2
Rd
Figure 2-2. Sample Oscillation Circuit 2
(Two-pin RC Oscillator)
OSC1
OSC2
VSS
L
Lvss
Losc
Cext
Rext
Figure 2-3. Sample Oscillation Circuit 3
(External Oscillator)
OSC2
VDD
OPEN
OSC1
VSS
Losc
External
Oscillator
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| LC6513A | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:SINGLE-CHIP 4-BIT MICROCOMPUTER FOR CONTROL-ORIENTED APPLICATIONS(LOW-THRESHOLD INPUT, ON-CHIP FLT DRIVER) |
| LC651431F | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Four-Bit CMOS Microcontrollers for Small-Scale Control Applications |
| LC651431L | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Four-Bit CMOS Microcontrollers for Small-Scale Control Applications |
| LC651431N | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Four-Bit CMOS Microcontrollers for Small-Scale Control Applications |
| LC651432F | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Four-Bit CMOS Microcontrollers for Small-Scale Control Applications |
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