Design Files
Receive the full breakdown. See the product footprint and more in the eCad file.
- No Longer Manufactured
- MC34972
MSDI with Suppressed Wake-up
- 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 Specifications and information herein are available for historical reference only.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® MC34972 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 MCU through a serial peripheral interface (SPI)
- 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 for the MCU to read
Product Details
Block Diagram
Features
System Features
- 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 V SPI protocol
- Selectable wake-up on change of state
- Selectable wetting current (16 or 2 mA)
- Eight programmable inputs (switches to supply 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
- 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)
