MC33975ATEK

MC33975ATEK is a multiple switch detection interface with suppressed wakeup designed to detect the closing and opening of up to 22 switch contacts. The switch status, either open or closed, is transferred to the microprocessor unit (MCU) through a serial peripheral interface (SPI). The device also features a 22-to-1 analog multiplexer for reading inputs as analog. It has two modes of operation, Normal and Sleep. Normal mode allows programming of the device and supplies switch contacts with pull-up or pull-down current as it monitors the switch change of state. The Sleep mode provides low quiescent current, which makes the 33975 ideal for automotive and industrial products requiring low sleep state currents. The application includes automotive systems, industrial control systems, process control systems, security systems, and systems requiring switch status verification for safety, operation, or process control purposes.

• Designed to operate from 5.5V <lt/> VPWR <lt/> 28V
• Switch input voltage range from -14 to 40V
• Interfaces to microprocessor using 3.3V/5.0V SPI protocol
• 14 switch-to-ground inputs, 8 programmable inputs (switches to battery or ground)
• Sleep state current VPWR 100µA, VDD 20µA
• Supply voltage range from 8.0 to 28V (fully operational, f 3.0 to 5.5V, TA = 25°C)
• VPWR supply voltage power on reset range from 4.2 to 5.0V (TA = 25°C)
• Logic supply voltage range from 3.0 to 5.5V (TA = 25°C)
• Switch detection threshold range from 3.70 to 4.3V (TA = 25°C)
• 32 pin SOICW EP package, ambient temperature range from -40 to 125°C