Multiple Input Switch Monitor LSI for Automotive - BD3378MUV-M (New)

BD3378MUV-M 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. BD3378MUV-M 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.

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Part number
Unit Quantity
Minimum Package Quantity
Packing Type
BD3378MUV-ME2 Active VQFN48MCV070 1500 1500 Taping Yes
Fully Functional Voltage(Min.)[V] 6.0
Fully Functional Voltage(Max.)[V] 28.0
VDDI Supply Voltage(Min.)[V] 3.9
VDDI Supply Voltage(Max.)[V] 6.0
Switch Input Number 22
Switch Input Voltage(Min.)[V] -14.0
Switch Input Voltage(Max.)[V] 40.0
Wetting Current (Min) 1mA, 3mA, 5mA, 10mA, 15mA
Wetting Current Type Pull up / Pull down
Intermittent Monitoring Current [µA] 100
Control Interface SPI
Clock Frequency (Max)[MHz] 4
Operating Temperature (Min.)[°C] -40
Operating Temperature (Max.)[°C] 125
    • AEC-Q100 Qualified(Grade 1)
    • Uses 3.3V/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 Pins (VPUA)
    • 14 Source Input Pins
    • Separable Power Supply VPUA: 16ch (INA&INZ), VPUB: 6ch (INB)
    • Interrupt Notification upon Switch Status Change
    • 1 Time to 6 Times Matched LPF that Eliminates Input Pin Noise
    • Low Current Consumption (Intermittent Monitoring)
    • Status Display of Selected Pin at DMUX Pin
Other New/Updated Products Relating to Interface
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BD3376EFV-C Multiple Input Switch Monitor LSI for Automotive HTSSOP-B30   Buy Sample
New Products:
ROHM Semiconductor reserves the right to change the specifications at any time.
Technical Data
Thermal Resistance

The definition and how to use thermal resistance and thermal characterization parameter of packages for ROHM’s integrated circuit are described in this application note.