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MAX6818EAP+T 其他数据使用手册 - Maxim Integrated（美信）
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接口芯片
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SSOP-20
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MAXIM INTEGRATED PRODUCTS MAX6818EAP+T 专用接口, 汽车应用, 工业仪器, 电脑板仪器, 便携式仪器, 2.7 V, 5.5 V, SSOP, 20 引脚
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MAX6818EAP+T数据手册
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Maxim > Design Support > Technical Documents > Tutorials > Analog Switches and Multiplexers > APP 764
Keywords: switch debouncers, 15kV, ESD, switch protection, debouncing,
TUTORIAL 764
Interfacing Switches and Relays to the Real World
in Real Time
Jul 22, 2002
Abstract: This note discusses the effects on switches when used to connect loads. High currents through
a switch degrade its quality when used as a power switch. Both mechanical switches and relays exhibit
switch bounce during operation. The MAX6816/MAX6817/MAX6818 provide switch debouncing and
±15kV ESD protection.
Designing the external interface to an industrial or automotive application can be challenging for an
uninitiated systems engineer. The bouncing of switch and relay contacts can produce arcs that threaten
system reliability. Electrostatic discharge (ESD) can also threaten reliability and uptime. The purpose of
this discussion is to ease the task of designing an interface between the inputs of a microcontroller and a
hostile industrial or automotive environment.
Switch Bounce
The ideal switch operation depicted in most textbooks—a single transition that occurs instantly on
actuation, followed by zero on-resistance—has never existed! Real switches exhibit a finite resistance
called "contact resistance," that increases over time with the number of switch actuations. Contact
resistance for a new switch ranges from less than 50mΩ to 100mΩ, depending on the contact material,
power loading, environmental conditions, and switch usage.
As a switch changes state, its contacts travel through several open-close cycles called "contact bounce"
before coming to rest in the final state. In some cases, this rapid contact bounce produces a changing
resistance as the moving contact wipes across the stationary contact. In Figure 1, a pushbutton switch
supplies 24V (a typical industrial-control voltage) to the resistor. Notice that at least four major switching
transitions occur before the output comes to rest at 24V. To a digital control system, these transitions
could be interpreted as four separate contact closures.
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