参数资料
型号: S1D13706F00A
元件分类: 显示控制器
英文描述: 320 X 240 PIXELS CRT OR FLAT PNL GRPH DSPL CTLR, PQFP100
封装: TQFP-100
文件页数: 131/171页
文件大小: 4940K
代理商: S1D13706F00A
7751 Group User’s Manual
20–65
APPENDIX
Appendix 8. Examples of noise immunity improvement
3. Wiring for analog input pins, analog power source pins, etc.
(1) Processing analog input pins
q Connect a resistor to the analog signal line, which is connected to an analog input pin, and make
the connection as close to the microcomputer as possible.
q Connect a capacitor between the analog input pin and AVss pin, as close to the AVss pin as
possible.
Reason: A signal which is input to the analog input pin is usually an output signal from a sensor.
The sensor which measures changes in status tends to be installed far from the microcomputer
printed circuit board. The result is long wiring that becomes an antenna which picks up
noise and feeds it into the microcomputer analog input pin.
If a capacitor between an analog input pin and AVss pin is grounded far away from AVss
pin, noise on the GND line may enter the microcomputer through the capacitor.
Fig. 10. Example of noise immunity improvement using thermistor
ANi
AVss
Thermistor
Noise
M37751
RI
CI
Reference value
RI : Approximately 100 to 1000
CI
Approximately 100 to 1000 pF
Notes 1 : Design an external circuit for ANi pin so that charge/discharge is available within 1
cycle of AD.
2 : This resistor and thermistor are used to divide resistance.
(Note 2)
:
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