S

6

DA9171A.000

July 31, 1997

APPLICATION INFORMATION

•

INPUT PROTECTION USING MAS9171A

The MAS9171A is a eight channel protection circuit for microprocessors in automotive applications that may

be used in industrial applications as well. All inputs are protected against energy rich pulses according to

DIN40839/ISO7637. Internal analog filters and suitable input threshold voltages provide the functionality

within a noise spectrum of 150KHz up to 1GHz without need of external filter components. The MAS9171A

is optimized for low current consumption.

VIN1

VIN2

VIN3

VIN4

VIN5

VIN6

VIN7

VIN8

VOUT1

VOUT2

VOUT3

VOUT4

VOUT5

VOUT6

VOUT7

VOUT8

VDD

GND

Protect

F lter

COMP

Fig. 3: Block diagram of MAS9171A

Advantages of MAS9171A

- lower price when comparing Part+Board costs

- easy layout

- better reliability

- less test time

- universal to use, less development time

•

APPLICATION EXAMPLES

MAS9171

Voltage-

Regulator

+ Reset

Filter+

Protection

VBAT

PGND

Vdd

Vdd

MAS9171

Vdd

MAS9171

Vdd

Oil

Sensors

Switch

1

Gen-

erator

Batt.

Tacho

ABS

0-12V

uC

Instrument

Driver

EEPROM

Port1

Port2

Port3

Res

Lamp

Driver

Vbat

Vbat

Fig.4: Electronic Dashboard for Cars