Design Files
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- No Longer Manufactured
- MC34975
MSDI with Suppressed Wake-up and 32 mA Wetting Current
- This page contains information on a product that is no longer manufactured (discontinued). Specifications and information herein are available for historical reference only.
The NXP® MC34975 Multiple Switch Detection Interface (MSDI) 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 microcontroller unit (MCU) through a serial peripheral interface (SPI)
- The device also features a 22-to-1 analog multiplexer for reading inputs as analog
Product Details
Block Diagram
Features
System Features
- Designed to operate from 5.5 V <= VPWR <= 28 V
- Switch input voltage range: -14 V to VPWR 40 V Max
- Interfaces to microprocessor using 3.3 V/5.0 V SPI protocol
- Selectable wake-up on change of state
- 14 switch-to-ground inputs
- Eight programmable inputs (switches to supply or ground)
- Selectable wetting current (32 mA or 4 mA for switch-to-ground inputs)
- Sleep State current: VPWR 100 µA, VDD 20 µA
- Signal conditioning and switch monitoring device function
- Package termination count: 32
- SSOP32 package type
- SPI interface and input control
- Load supply voltage 5.5 V (Min), 26 V (Max)
- Ambient operating temperature -40 °C (Min), 85 °C (Max)
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