Design Files
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MSDI with Suppressed Wakeup
The NXP® MC33972 multiple switch detection interface with suppressed wake-up is designed to detect the closing and opening of up to 22 switch contacts.
- The switch status, either open or closed, is transferred to the MCU through a SPI
- 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 for the MCU to read
- Two modes of operation:
- Normal: allows programming of the device and supplies switch contacts with pull-up or pull-down current monitoring switch change of state
- Sleep: provides low quiescent current, making MC33972 ideal for automotive and industrial products requiring low sleep state currents
Product Details
Features
Key Features
- Interfaces directly to microprocessor using 3.3 V / 5.0 V SPI protocol
- Selectable wake-up on change of state
- Eight programmable inputs (switches to battery or ground)
- Fourteen switch-to-ground inputs
- Active Interrupt (INT) on change-of-switch state
- Switch Voltage Range -14 – VPWR
- Operating Voltage 5.5 V – 26 V (VPWR)
- Power train control, signal conditioning and switch monitoring device functions
- 32 package termination count
- Package type: SSOP32
- Ambient operating temperature -40 to 125 °C
Product Longevity Program
- This product is included in the NXP Product Longevity Program ensuring a stable supply of products for your embedded designs. The MC33972 is included in the 15-year program
Part numbers include: MC33972ATEK, MC33972ATEW, MC33972TEW.
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Documentation
Quick reference to our documentation types.
4 documents
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Data Sheet
MC33972, Multiple Switch Detection Interface with Suppressed Wake-upFeatured
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Application Note
AN3670, Implementing a DSI Network Using the MC33781 and the MC33784
Design Resources
Hardware
Quick reference to our
board types.
2 hardware offerings
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Evaluation and Development BoardsEvaluation Kit - USB-SPI Interface, MC68HC908JW32, DongleFeatured
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Evaluation and Development BoardsEvaluation Kit - 33972, MSDI with Suppressed Wake-UpFeatured
Software
Quick reference to our software types.
1 software file
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Configuration Tools
SPI Generator (SPIGen) Software
Note: For better experience, software downloads are recommended on desktop.
Engineering Services
To get further assistance directly from NXP, please see our Engineering Services.
3 engineering services
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Independent Design House (IDH)
Hardware Design Services
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Original Design Manufacturer (ODM)
Hardware and Software Engineering Services
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Independent Design House (IDH)
Embedded Software Design
To find additional partner offerings that support this product, visit our Partner Marketplace.