The MC33989 is a monolithic integrated circuit combining many functions frequently used in microcontroller based systems. A fully protected fixed 5.0 V low drop regulator output with current limit, over temperature pre-warning, and reset provides power for CAN and the MCU. The MC33989 also provides the drive and sense inputs necessary to implement a second 5.0 V regulator, using an external series pass PNP, that is resistor ratio adjustable to meet peripheral needs. MC33989 has normal, standby, stop, and sleep modes, an internally switched high-side power supply voltage output with four wake-up inputs, programmable window Watch-Dog, Interrupt, Reset, high speed CAN transceiver for module-to-module communication, and SPI input control. The combination is an economical solution for providing power, high speed communication, and control needed for MCU based systems.
Features
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Low-drop voltage regulator with current limiting,over temperature pre-warning, and output monitoring with reset
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Adjustable external series pass PNP regulator
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Normal, standby, stop and sleep modes separate from CAN interface modes
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150 mA switched V BAT output for control of external circuitry
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Four external wake-up inputs, associated with switched V BAT
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Low standby and sleep current
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V BAT monitoring and V BAT failure detection
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40 V maximum transient voltage
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Software programmable watch-dog window, interrupt, and reset
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Multiple wake-up modes
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SPI interface to MCU
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Utility for HS1 Vbat switch allowing drive of external switches pull up resistors or relays
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This product is included in Freescale’s , with assured supply for a minimum of 15 years after launch
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