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