參數資料
型號： LC651431F
廠商： Sanyo Electric Co.,Ltd.
英文描述： Four-Bit CMOS Microcontrollers for Small-Scale Control Applications
中文描述： 4位CMOS微控制器的小規(guī)?？刂浦械膽?/td>
文件頁數： 37/39頁
文件大?。?/td> 374K
代理商： LC651431F
Notes on PCB Construction
This section presents notes on noise as seen from the microcontroller itself and methods for reducing such noise when
designing the printed circuit board for a mass-produced product using these microcontrollers. The design techniques
presented here can be effective for preventing or avoiding problems (such as microcontroller malfunction and program
runaway) due to noise.
1. V
DD
and V
SS
: Power supply pins
Insert capacitors that meet the following conditions between the V
DD
and V
SS
pins.
For each of the capacitors C1 and C2, make the wiring lengths from the IC as close to equal as possible (L1 = L1’
and L2 = L2’), and keep these lines as short as possible as well.
Insert the capacitors C1, a large capacitor, and C2, a small capacitor, in parallel.
The V
DD
and V
SS
lines in the printed circuit board pattern should be wider than any other lines.
2. OSC1 and OSC2: Clock input and output pins
When the ceramic oscillator option is selected (figure 2-1)
Keep the length (L
OSC
) of the connection lines between the
clock I/O pins (input: OSC1, output: OSC2) and the
external components as short as possible.
Keep the length (L
VSS
+ L1 (L2)) from the V
SS
side of the
capacitor connected to the oscillator element to the V
SS
pin
as short as possible.
V
SS
line for the oscillator circuit and other V
SS
lines
should branch from a point nearest to the V
SS
pin.
There are cases where the values of the oscillator circuit
components (the capacitors C1 and C2, the limit resistor
Rd, and other components) must be modified from the
values recommended in this document to adjust the
oscillator frequency. Consult with the oscillator element
manufacturer when determining the component values.
When the 2-pin RC oscillator option is selected (figure 2-2)
Keep the length (L
OSC
) of the connection lines between the
clock I/O pins (input: OSC1, output: OSC2) and the
external components (the capacitor Cext and the resistor
Rext) as short as possible.
Keep the length (L
VSS
+ Lc) from the V
SS
side of the
capacitor connected to the oscillator element to the V
SS
pin
as short as possible.
V
SS
line for the oscillator circuit and other V
SS
lines should branch from a point nearest to the V
SS
pin.
No. 6498-37/39
LC651432N/F/L, 651431N/F/L
Figure 2-1 Oscillator Circuit Example 1
(ceramic oscillator)
V
SS
V
DD
L1
L2
C2
C1
+
L1’
L2’
L
VSS
V
SS
OSC2
OSC1
C1
C2
Rd
L
L
L
OSC
Figure 2-2 Oscillator Circuit Example 2
(2-pin RC oscillator)
V
SS
OSC1
OSC2
L
VSS
L
L
OSC
Rext
Cext
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相關代理商/技術參數
參數描述
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
LC651432L 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
LC651432N 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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