mc33911 Freescale Semiconductor, Inc, mc33911 Datasheet - Page 22

• Manufacturer Part Number: mc33911
• Description: Mc33911 Lin System Basis Chip With Dc Motor Pre-driver
• Manufacturer: Freescale Semiconductor, Inc

ANALOG CIRCUITRY
operating conditions. A fully configurable window watchdog
circuit will reset the connected MCU in case of an overflow.
wake-up sources to reactivate the device. Two analog / digital
inputs can be sensed or used as the wake-up source.
(VSENSE), the internal chip temperature (CTEMP) as well as
the motor current using an external sense resistor.)
HIGH SIDE DRIVER
with PWM capability is provided to drive small loads such as
status LED’s or small lamps.
power modes.
LOW SIDE DRIVERS
drivers with PWM capability are provided to drive H-
Bridge type relays for power motor applications.
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33911
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
The 33911 is designed to operate under automotive
Two low-power modes are available with several different
The device is capable of sensing the supply voltage
One current and temperature protected high side driver
The driver can be configured for periodic sense during low-
Two current and temperature protected low side
MC33911 - Functional Block Diagram
Analog Circuitry
Integrated Supply
MCU Interface and Output Control
LIN Interface / Control
SPI Interface
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
Figure 14. Functional Internal Block Diagram
Integrated Supply
Analog Circuitry
Analog Output 0
LS/HS - PWM Control
Reset & IRQ Logic
MCU INTERFACE
through a standard 8-Bit SPI interface. Critical system events
such as low or high-voltage/temperature conditions as well as
over-current conditions in any of the driver stages can be
reported to the connected MCU via IRQ or RST.
controlled via the SPI register as well as PWMIN input.
configured via the SPI register and its communication is
driven through the RXD and TXD device pin.
pin.
VOLTAGE REGULATOR OUTPUTS
VDD main regulator output is designed to supply an MCU
with a precise 5V.
LIN PHYSICAL LAYER INTERFACE
layer interface with selectable slew rate and various
diagnostic features.
MCU Interface and Output Control
The 33911 is providing its control and status information
Both low side and both high side driver outputs can be
The integrated LIN physical layer interface can be
All internal analog sources are multiplexed to the ANOUT0
One voltage regulators is implemented on the 33911. The
The 33911 provides a LIN 2.0 compatible LIN physical
Drivers
LIN Physical Layer
Low Side Drivers
High Side Driver
LS1 - LS2
Interface
HS1
Analog Integrated Circuit Device Data
Freescale Semiconductor