33 channel Multiple Switch Detection Interface with Programmable Current

The CD1030 is a SMARTMOS device that features 35-to-1 analog multiplexers for reading analog inputs. It is also a multiple switch detection interface designed to detect the closing and opening of 33 switch contacts. The switch status is transferred to the microcprocessor through a SPI in automotive environments.

The analog input signal is buffered and provided on the analog multiplexer output pin for the MCU to read. It also features individually selectable input currents in Normal and Low-power mode. And with its SPI interface, connecting to other MCUS will be no problem.

Functional Block DIagram

Functional Block DIagram

 

Why Used?

  •  Fully functional operation 4.5 V ≤ VBATP ≤ 36 V
  • Full parametric operation 6.0 V ≤ VBATP ≤ 28 V
  • Operating switch input voltage range from -1.0 V to 36 V
  • 12 programmable inputs (switches to battery or ground)
  • 21 switch-to-ground inputs • Selectable wetting current (2.0, 6.0, 8.0, 10, 12, 14, 16, or 20 mA)
  • Interfaces directly to an MCU using 3.3 V / 5.0 V SPI protocol
  • Selectable wake-up on change of state • Typical standby current IBATP = 50 μA and

Where Used?

  • Automotive
    • Heating ventilation and air conditioning (HVAC) •
    • Lighting • Central gateway / in-vehicle networking •
    • Gasoline engine management
  • Industrial
    • Programmable logic control (PLC)
    • Process control, temperature control
    • Input-output control (I/O Control)
    • Single board computer
    • Ethernet switch

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