S

7

DA9171A.000

July 31, 1997

APPLICATION INFORMATION

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

Filter+

Protection

V Ignition

V Bat

Voltage-

Regulator

+Reset

Vdd

Vdd

MAS9171

µC

4x47K

4x47K

Xtal1

Xtal2

Res

Vdd

Fig. 5: Application Circuit (Detection of Switches)

IMPORTANT !

• 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 V

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