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| 型號(hào)： | LC65F1306A* |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 文件頁數(shù)： | 20/22頁 |
| 文件大?。?/td> | 685K |
LC65F1306A
No.6829-20/22
Notes on Circuit Board Design
This section provides hints and countermeasure for noise problem in terms of microcontroller when designing circuit boards
using these microcontrollers 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 length of the line from the VDD to the two capacitors and the length of the line from the VSS to the two capacitors
should be as equal 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. In this case, contact the
oscillator manufacturer about it.
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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