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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, sing an external series pass PNP, that
is resistor ratio adjustable to meet peripheral needs. MC33989
has normal, standby, stop, nd 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.
 Block
Diagram
MC33989 Features
- Low-drop voltage regulator with current limiting,over
temperature pre-warning,and output monitoring with reset
- Adjustable external series pass PNP regulator
- Normal,standby,stop and sleep modes separate from CAN
interface modes
- 150 mA switched V BAT output for control of external
circuitry
- Four external wake-up inputs,associated with switched V
BAT
- Low standby and sleep current
- V BAT monitoring and V BAT failure detection
- 40 V maximum transient voltage
- Software programmable watch-dog window, interrupt, and
reset
- Multiple wake-up modes
- SPI interface to MCU
- Utility for HS1 Vbat switch allowing drive of external
switches pull up resistors or relays
- CONTACT SALES FOR ERRATA SHEET
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