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參數(shù)資料
| 型號： | TMP91CW12AF |
| 廠商： | Toshiba Corporation |
| 元件分類： | 微控制器 |
| 英文描述： | Quality And Reliability Assurance / Handling Precautions |
| 中文描述： | 質(zhì)量與可靠性保證/操作注意事項(xiàng) |
| 文件頁數(shù)： | 39/48頁 |
| 文件大?。?/td> | 390K |
| 代理商： | TMP91CW12AF |
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Quality and Reliability Assurance / Handling Precautions
030901
QUA-39
2002-02-20
4.3.12 Electromagnetic Interference
Widespread use of electrical and electronic equipment in recent years has
brought with it radio and TV reception problems due to electromagnetic
interference. To use the radio spectrum effectively and to maintain radio
communications quality, each country has formulated regulations limiting the
amount of electromagnetic interference which can be generated by individual
products.
Electromagnetic interference includes conduction noise propagated through
power supply and telephone lines, and noise from direct electromagnetic
waves radiated by equipment. Different measurement methods and corrective
measures are used to assess and counteract each specific type of noise.
Difficulties in controlling electromagnetic interference derive from the fact
that there is no method available which allows designers to calculate, at the
design stage, the strength of the electromagnetic waves which will emanate
from each component in a piece of equipment. For this reason, it is only after
the prototype equipment has been completed that the designer can take
measurements using a dedicated instrument to determine the strength of
electromagnetic interference waves.
Yet it is possible during system design to incorporate some measures for the
prevention of electromagnetic interference, which can facilitate taking
corrective measures once the design has been completed. These include
installing shields and noise filters, and increasing the thickness of the power
supply wiring patterns on the printed circuit board. One effective method, for
example, is to devise several shielding options during design, and then select
the most suitable shielding method based on the results of measurements
taken after the prototype has been completed.
4.3.13 Peripheral Circuits
In most cases semiconductor devices are used with peripheral circuits and
components. The input and output signal voltages and currents of these
circuits must be chosen to match the semiconductor device’s specifications.
The following factors must be taken into account.
(1)
Inappropriate voltages or currents applied to a device’s input pins may
cause it to operate erratically. Some devices contain pull-up or pull-down
resistors. When designing your system, remember to take the effect of this
on the voltage and current levels into account.
The output pins on a device have a predetermined external circuit drive
capability. If this drive capability is greater than that required, either
incorporate a compensating circuit into your design or carefully select
suitable components for use in external circuits.
(2)
4.3.14 Safety Standards
Each country has safety standards which must be observed. These safety
standards include requirements for quality assurance systems and design of
device insulation. Such requirements must be fully taken into account to
ensure that your design conforms to the applicable safety standards.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TMP91CW12AF9999(BZ) | 制造商:Toshiba America Electronic Components 功能描述: |
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