Datasheet Multiple Input Switch Monitor LSI for Automotive BD3381EKV-C General Description Features (Note 1) BD3381EKV-C is a 33-channel Multiple Input Switch AEC-Q100 Qualified Monitor IC that detects the opening and closing of Uses 3.3 V/5.0 V SPI Protocol in Communicating with mechanical switches. Once it senses a change in the the MCU status of a switch, it sends an interrupt signal to the MCU Serial Communication Error Checking through 8-bit via a serial peripheral interface (SPI). CRC The 33 switch inputs have two types of power supply, Thermal Shutdown Protection (TSD) VPUB and VPUA. The VPUB and the VPUA power Power on Reset (POR) supplies can either be from a battery or from another Selectable Source/Sink Current Levels through Register power supply system. VPUB is the supply for the INB Settings inputs while VPUA is for the INZ and INA inputs. Wetting Current Timer Capability BD3381EKV-C has two modes of operation, Normal and 12 Source or Sink Input Pins (VPUA) Sleep. In both modes, the internal registers can be set to 21 Source Input Pins make the device perform either intermittent or continuous Separable Power Supply monitoring of the switches. VPUA: 22-channel (INA&INZ), VPUB: 11-channel (INB) In intermittent monitoring, the switch status is monitored Interrupt Notification upon Switch Status Change at regular time intervals, allowing the IC to operate with 1 Time to 10 Times Matched LPF that Eliminates Input low power consumption. Also, operation with reduced Pin Noise noise can be achieved by enabling uniform sequential Low Current Consumption (Intermittent Monitoring) monitoring of all switches or sequential monitoring by Status Display of Selected Pin at DOUT Pin (Note 1) Grade 1 power supply system. Package W(Typ) x D(Typ) x H(Max) Application HTQFP64BV 12.00 mm x 12.00 mm x 1.00 mm Engine Control Module (64 pin QFP) Key Specifications Low-voltage Operating Range: 3.9 V to 6.0 V Fully Operational Voltage Range: 6 V to 28 V Input Voltage on Switch Pin: -14 V to +40 V Selectable Wetting Current (Min): 1 mA, 3 mA, 5 mA, 10 mA, 15 mA Typical Application Circuit DCDC +B VPUA/VPUB VIN VOUT1 BD3381EKV-C +B INZ0 VPUB VPUA/+B VPUA VPUA/VPUB VPUA INZ11 VOUT2 MCU WATCHDOG INA0 RESET INTB INTB INA9 SI SI VIN SCLK SCLK INB0 CS CSB SO SO INB10 IO DOUT REF5 VDDI VDDL TEST GND Figure 1. Typical Application Circuit Product structure : Silicon monolithic integrated circuit This product has no designed protection against radioactive rays www.rohm.com TSZ02201-0E3E0H700780-1-2 2018 ROHM Co., Ltd. All rights reserved. 1/78 TSZ22111 14 001 09.Aug.2018 Rev.001 VPUB VPUB N.C. REF5 VDDL TEST DOUT GND GND CSB SCLK SI SO INTB VDDI VDDI BD3381EKV-C Pin Configuration 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 49 GND N.C. 32 GND 50 N.C. 31 51 N.C. N.C. 30 INB10 52 INZ0 29 53 INB9 INZ1 28 INB8 54 INZ2 27 55 INB7 INZ3 26 INB6 56 INZ4 25 EXP-PAD 57 INB5 INZ5 24 INB4 58 23 INZ6 59 INB3 INZ7 22 INB2 60 INZ8 21 61 INB1 INZ9 20 62 INB0 19 INZ10 63 N.C. INZ11 18 N.C. 64 N.C. 17 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Figure 2. Pin Configuration (Top View) www.rohm.com TSZ02201-0E3E0H700780-1-2 2018 ROHM Co., Ltd. All rights reserved. 2/78 TSZ22111 15 001 09.Aug.2018 Rev.001 GND N.C. VPUA VPUA INA9 INA8 INA7 INA6 INA5 INA4 INA3 INA2 INA1 INA0 N.C. N.C.