MC33972APEWR2

Specialized Overview

The MC33972APEWR2 is a multiple switch detection interface with suppressed wake-up, designed to detect up to 22 switch contacts. It interfaces directly to microprocessors via a 3.3 V or 5.0 V SPI protocol. The device operates within a supply voltage range of 5.5 V to 26 V and supports switch input voltages from -14 V to 40 V maximum. It features eight programmable inputs (switches to battery or ground) and fourteen switch-to-ground inputs. Typical standby current is 100 µA at VPWR and 20 µA at VDD. The component is housed in a 32-pin SOICW package.

Specialized Feature Summary

• Detects opening and closing of up to 22 switch contacts with status transfer via SPI.
• Includes an analog multiplexer for reading inputs as analog signals on the AMUX pin.
• Features selectable wetting currents of 16 mA or 2.0 mA for switch contact maintenance.
• Supports low quiescent current sleep mode with programmable wake-up on state change.

Specialized Applications

• Automotive switch monitoring systems
• Industrial control panels requiring low sleep-state currents
• Microprocessor-based systems interfacing with multiple switches

Specialized Procurement Notes

Verify the specific suffix 'EW' indicates lead-free packaging and 'R2' denotes reel/cut tape format. Confirm the 'A' variant supports the extended 40 V switch input voltage range compared to standard versions. Ensure compatibility with the 32-pin SOICW EP package requirements for thermal management.

Specialized Selection Notes

Select this component when interfacing with microcontrollers requiring direct SPI connection for switch status. Consider the 40 V maximum switch input rating for automotive environments. Evaluate the need for analog multiplexing capabilities if sensor readings are required alongside digital switch states.

Specialized Part Context

This part belongs to the MC33972 family of multiple switch detection interfaces. It is manufactured by NXP Semiconductors, formerly Freescale Semiconductor. The device replaces discrete components in switch detection circuits, providing integrated wetting current and wake-up suppression functions.

Specialized Replacement Considerations

MC33972TEW/R2 is a documented variation within the same family. Verify if the 'T' variant meets the 40 V switch input requirement, as the 'A' variant specifically supports up to 40 VDC while others may support 38 VDC.