System Basis Chip With High Speed CAN Transceiver

The MC33989 is a monolithic integrated circuit combining many functions frequently used by automotive ECUs. It incorporates:

- Two voltage regulators.

- Four high voltage inputs.

- 1Mbaud CAN physical interface.

? Vdd1: Low drop voltage regulator, current limitation, over temperature detection, monitoring and reset function

? Vdd1: Total current capability 200mA (including CAN current, 120mA for MCU and external peripheral components)

? V2: control circuitry for external bipolar ballast transistor for high flexibility in choice of peripheral voltage and current supply.

? Four operational modes (normal, stand-by, stop and sleep mode)

? Low stand-by current consumption in stop and sleep modes

? High speed 1MBaud CAN physical interface.

? Four external high voltage wake-up inputs, associated with HS1 Vbat switch

? 150mA output current capability for HS1 Vbat switch allowing drive of external switches pull up resistors or relays

? Vsup failure detection

? Nominal DC operating voltage from 5.5 to 27V, extended range down to 4.5V.

? 40V maximum transient voltage

? Programmable software time out and window watchdog

? Safe mode with separate outputs for Watchdog time out and Reset

? Wake up capabilities (four wake up inputs, programmable cyclic sense, forced wake up, CAN interface and SPI)

? Interface with MCU through SPI