DESCRIPTION

The IC monitors the status of all switch contacts connected to ground continuously .

The input currents are compared with the current of an internal reference resistor. The IC is designed to operate with an external series resistor RIN0 to RIN7 of 1kÝ. The current, driven through the contacts keeps their resistance low.

FEATURES

► Supply voltage range VDD 4.75V to 5.25V

► Monitoring supply voltage range VS 5.25V to 25V

► Maximum overvoltage protection up to 40V

► Internal clamp diodes at each input to VS and GND

► Low standby current ( typical < 10µA )

► Contact status monitoring by comparison of the resistance at the inputs with an internal reference

► High noise immunity

► – 40°C to + 125°C operating temperature

► SO20w package

APPLICATION

► Automotive electronics

► Monitor for mechanical switches

► Monitor for voltage levels