MAS9171A Ver la hoja de datos (PDF) - Micro Analog systems

Número de pieza

componentes Descripción

Fabricante

MAS9171A

OCTAL PORT PROTECTON

Micro Analog systems 

S

APPLICATION INFORMATION

Fig. 5 shows how to use the MAS9171A to detect the condition of switches

DA9171A.000

July 31, 1997

V Bat

V Ignition

Vdd

Filter+

Voltage-

Protection

Regulator

+Reset

4x47K

1 1 2 4 Vdd

Res

Vdd

MAS9171

µC

4x47K

Xtal1 Xtal2

Fig. 5: Application Circuit (Detection of Switches)

IMPORTANT !

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•

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The MAS9171A shall be placed closely to the microprocessor to avoid voltage spikes at the

uC inputs caused by currents on the Supply Pins and/or Pins OUT1 to OUT8.

A block capacitor of 33nF close to the Supply Pins is recommended

It is important to connect external Pull-Up resistors to Vignition in order to prevent quiescent

current into the MAS9171A (Note: MAS9171A has internal pull-down of 225Koms to Gnd).

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