Multiple Input Switch Monitor LSI for Automotive - BD3375KV-C

BD3375KV-C is a 22-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 22 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. BD3375KV-C has two modes of operation, Normal and Sleep. In both modes, the internal registers can be set to make the device perform either intermittent or continuous monitoring of the switches. In intermittent monitoring, the switch status is monitored at regular time intervals, allowing the IC to operate with low power consumption. Also, operation with reduced noise can be achieved by enabling uniform sequential monitoring of all switches or sequential monitoring by power supply system.

Part Number | BD3375KV-CE2
Status | Active
Package | VQFP48C
Unit Quantity | 1500
Minimum Package Quantity | 1500
Packing Type | Taping
RoHS | Yes
Functional Safety | FS supportive


Common Standard

AEC-Q100 (Automotive Grade)

Fully Functional Voltage(Min.)[V]


Fully Functional Voltage(Max.)[V]


VDDI Supply Voltage(Min.)[V]


VDDI Supply Voltage(Max.)[V]


Switch Input Number


Switch Input Voltage(Min.)[V]


Switch Input Voltage(Max.)[V]


Wetting Current (Min)

1mA, 3mA, 5mA, 10mA, 15mA

Wetting Current Type

Pull up / Pull down

Intermittent Monitoring Current [µA]


Control Interface


Clock Frequency (Max)[MHz]


Operating Temperature (Min.)[°C]


Operating Temperature (Max.)[°C]



  • AEC-Q100 Qualified (Grade 1)
  • Operational Voltage Range: 3.9V to 8V
  • Uses 3.3/5.0V SPI protocol in communicating with the MCU
  • Serial communication error checking through 8bit-CRC
  • Thermal Shutdown Protection (TSD)
  • Power on Reset (POR)
  • Selectable source/sink current levels through register settings
  • Wetting current timer capability
  • 8 source or sink input terminals
  • 14 source input terminals
  • Separable Power Supply
    VPUA: 16ch (INA&INZ), VPUB: 6ch (INB)
  • Interrupt notification upon switch status change
  • 1 to 6 times matched LPF that eliminates input terminal noise
  • Low current consumption (Intermittent monitoring)
  • Status display of selected terminal at DMUX terminal