General Description
BD3381EKV-C is a 33-channel Multiple Input Switch Monitor IC that detects the opening and closing of mechanical switches. Once it senses a change in the status of a switch, it sends an interrupt signal to the MCU via a serial peripheral interface (SPI).
The 33 switch inputs have two types of power supply, VPUB and VPUA. The VPUB and the VPUA power supplies can either be from a battery or from another power supply system. VPUB is the supply for the INB inputs while VPUA is for the INZ and INA inputs.

FEATUREs
◾ AEC-Q100 Qualified (Note 1)
◾ Uses 3.3 V/5.0 V SPI Protocol in Communicating with
   the MCU
◾ Serial Communication Error Checking through 8-bit
   CRC
◾ Thermal Shutdown Protection (TSD)
◾ Power on Reset (POR)
◾ Selectable Source/Sink Current Levels through Register
   Settings
◾ Wetting Current Timer Capability
◾ 12 Source or Sink Input Pins (VPUA)
◾ 21 Source Input Pins
◾ Separable Power Supply
   VPUA: 22-channel (INA&INZ), VPUB: 11-channel (INB)
◾ Interrupt Notification upon Switch Status Change
◾ 1 Time to 10 Times Matched LPF that Eliminates Input
   Pin Noise
◾ Low Current Consumption (Intermittent Monitoring)
◾ Status Display of Selected Pin at DOUT Pin
   (Note 1) Grade 1

APPLICATION
◾ Engine Control Module