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參數(shù)資料
| 型號(hào)： | S1C63653F |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, FLASH, 4 MHz, MICROCONTROLLER, CQFP100 |
| 封裝： | CERAMIC, QFP15-100 |
| 文件頁(yè)數(shù)： | 20/121頁(yè) |
| 文件大?。?/td> | 1127K |
| 代理商： | S1C63653F |
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108
EPSON
S1C63653 TECHNICAL MANUAL
CHAPTER 5: SUMMARY OF NOTES
5.3 Precautions on Mounting
<Oscillation Circuit>
● Oscillation characteristics change depending on conditions (board pattern, components used, etc.).
In particular, when a ceramic oscillator or crystal oscillator is used, use the oscillator manufacturer's
recommended values for constants such as capacitance and resistance.
● Disturbances of the oscillation clock due to noise may cause a malfunction. Consider the following
points to prevent this:
(1) Components which are connected to the OSC1, OSC2, OSC3 and
OSC4 terminals, such as oscillators, resistors and capacitors,
should be connected in the shortest line.
(2) As shown in the right hand figure, make a VSS pattern as large as
possible at circumscription of the OSC1, OSC2, OSC3 and OSC4
terminals and the components connected to these terminals.
Furthermore, do not use this VSS pattern for any purpose other
than the oscillation system.
OSC4
OSC3
VSS
Sample VSS pattern (OSC3)
● In order to prevent unstable operation of the oscillation circuit due to current leak between OSC1/
OSC3 and VDD, please keep enough distance between OSC1/OSC3 and VDD or other signals on the
board pattern.
<Reset Circuit>
● The power-on reset signal which is input to the RESET terminal changes depending on conditions
(power rise time, components used, board pattern, etc.).
Decide the time constant of the capacitor and resistor after enough tests have been completed with the
application product. When using the built-in pull-down resistor of the RESET terminal, take into
consideration dispersion of the resistance for setting the constant.
● In order to prevent any occurrences of unnecessary resetting caused by noise during operating,
components such as capacitors and resistors should be connected to the RESET terminal in the
shortest line.
<Power Supply Circuit>
● Sudden power supply variation due to noise may cause malfunction. Consider the following points to
prevent this:
(1) The power supply should be connected to the VDD, VSS, VDDA and VSSA terminals with patterns as
short and large as possible.
In particular, the power supply for VDDA and VSSA affect R/f conversion accuracy.
(2) When connecting between the VDD and VSS terminals with a bypass capacitor, the terminals
should be connected as short as possible.
VDD
VSS
Bypass capacitor connection example
VDD
VSS
(3) Components which are connected to the VD1, VD2, VOSC and VC1–VC3 terminals, such as capacitors,
should be connected in the shortest line.
In particular, the VC1–VC3 voltages affect the display quality.
● Do not connect anything to the VC1–VC3 terminals when the LCD driver is not used.
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