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| 型号： | 7549 |
| 厂商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 单芯片8位CMOS微机 |
| 文件页数： | 55/73页 |
| 文件大小： | 1272K |
| 代理商： | 7549 |
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Rev.2.00
REJ03B0202-0200
Mar 05, 2007
Page 55 of 70
7549 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
2. Connection of bypass capacitor across V
SS
line
and V
CC
line
Connect an approximately 0.1
μ
F bypass capacitor across the
V
SS
line and the V
CC
line as follows:
Connect a bypass capacitor across the V
SS
pin and the V
CC
pin at equal length.
Connect a bypass capacitor across the V
SS
pin and the V
CC
pin with the shortest possible wiring.
Use lines with a larger diameter than other signal lines for
V
SS
line and V
CC
line.
Connect the power source wiring via a bypass capacitor to
the V
SS
pin and the V
CC
pin.
Fig 73. Bypass capacitor across the V
SS
line and the
V
CC
line
3. Wiring to analog input pins
Connect an approximately 100
to 1 k
resistor to an
analog signal line which is connected to an analog input
pin in series.
Besides, connect the resistor to the microcomputer as close
as possible.
Connect an approximately 1000 pF capacitor across the
V
SS
pin and the analog input pin. Besides, connect the
capacitor to the V
SS
pin as close as possible. Also, connect
the capacitor across the analog input pin and the V
SS
pin at
equal length.
<Reason>
Signals which is input in an analog input pin (such as an A/D
converter/comparator input pin) are usually output signals from
sensor. The sensor which detects a change of event is installed
far from the printed circuit board with a microcomputer, the
wiring to an analog input pin is longer necessarily. This long
wiring functions as an antenna which feeds noise into the
microcomputer, which causes noise to an analog input pin.
Fig 74. Analog signal line and a resistor and a capacitor
The analog input pin is connected to the capacitor of a
voltage comparator. Accordingly, sufficient accuracy may
not be obtained by the charge/discharge current at the time
of A/D conversion when the analog signal source of high-
impedance is connected to an analog input pin. In order to
obtain the A/D conversion result stabilized more, please
lower the impedance of an analog signal source, or add the
smoothing capacitor to an analog input pin.
V
SS
V
CC
V
SS
V
CC
N.G.
O.K.
Noise
Thermistor
Analog
input pin
(Note)
N.G.
O.K.
V
SS
Note : The resistor is used for dividing
resistance with a thermistor.
Microcomputer
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 7549_0710 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 7549_09 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 7-5-4905 | 功能描述:3M 4905 VHB TAPE SPECIALTY TAPES 制造商:3m (tc) 系列:VHB?? 4905 零件状态:在售 厚度 - 粘合剂:- 厚度 - 底布，载体:- 标准包装:1 |
| 754905-1 | 功能描述:PIN ATT/ROLL AUTO IV 制造商:te connectivity amp connectors 系列:* 零件状态:有效 标准包装:1 |
| 7-5-4910 | 功能描述:3M 4910 VHB TAPE SPECIALTY TAPES 制造商:3m (tc) 系列:VHB?? 4910 零件状态:在售 底布，载体:丙烯酸泡棉 厚度 - 粘合剂:- 厚度 - 底布，载体:- 标准包装:1 |
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