Design Files
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MSDI with 32 mA Suppressed Wakeup
The NXP® MC33975 multiple switch detection interface with suppressed wake-up is designed to detect the closing and opening of up to 22 switch contacts, ideal for automotive and industrial products requiring low sleep state currents.
- The switch status, open or closed, is transferred to the MPU through a serial peripheral interface
- Normal mode allows programming of the device and supplies switch contacts with pullup or pull-down current and Sleep mode provides low quiescent current
- The programmable interrupt timer for Sleep mode can be disabled, switch detection currents are 32 mA and 4.0 mA for switch-to-ground inputs, the interrupt bit is a reset bit, and the package is Pb-free
Product Details
Features
Key Features
- Designed to operate 5.5 V ≤ VPWR ≤ 26 V
- Switch input voltage range -14 V to VPWR, 40 V Max
- Interfaces directly to microprocessor Using 3.3 V/5.0 V SPI protocol
- Selectable wake-up on change of state
- Selectable wetting current (32 mA or 4.0 mA for switch-to-ground inputs)
- 8 programmable inputs (switches to battery or ground)
- 14 switch-to-ground inputs
- VPWR standby current 100 µA typical, VDD standby current 20 µA typical
- Pb-Free packaging designated by suffix code EK
- 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 MC33975 is included in the 15-year program
Part numbers include: MC33975ATEK, MC33975TEK.
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Documentation
Quick reference to our documentation types.
5 documents
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Application Note
AN3670, Implementing a DSI Network Using the MC33781 and the MC33784
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User Guide
KIT33975AEVB, Evaluation Board - User Guide
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Fact Sheet
Multiple Switch Detection Interface (MSDI)
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 - 33975, MSDI, 32mA 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.