Description

MC33972ATEW is an interface specialized electronic component that has a multiple switch detection interface with suppressed wake-up, designed to detect the opening and closing of up to 22 switch contacts. It transfers the switch status through a serial peripheral interface to the microprocessor unit (MCU). The device also features a 22-to-1 analog multiplexer for reading inputs as analog. The analog input signal is buffered and provided on the AMUX output pin to the MCU for reading.

Specifications and features

The key features of the MC33972ATEW are:

• Designed to operate 5.5 V ≤ VPWR ≤ 26 V
• Switch input voltage range -14 V to VPWR, 40 V Max
• Interfaces directly to MPU using 3.3 V/5.0 V SPI protocol
• Selectable wake-up on change of state
• Selectable wetting current (16 or 2.0 mA)
• 8 programmable inputs (switches to battery or ground)
• 14 switch-to-ground inputs
• Typical standby current - VPWR = 100 μA and VDD = 20 μA
• Active interrupt (INT) on change-of-switch state

Application Scenarios

The MC33972ATEW can be used in various electronic devices where multiple switch detection is required, such as automotive systems and home appliances.

Comparison

• Can detect up to 22 switch contacts
• Features a 22-to-1 analog multiplexer for reading inputs as analog
• Low power consumption with a typical standby current of 100 μA

• The device doesn't have a built-in oscillator, so an external oscillator might be required.
• The maximum input voltage of the switch is 40 V, which might be inadequate in some cases.