33911 datasheet(22/45 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33911

FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

Figure 14. Functional Internal Block Diagram

ANALOG CIRCUITRY

The 33911 is designed to operate under automotive

operating conditions. A fully configurable window watchdog

circuit will reset the connected MCU in case of an overflow.

Two low-power modes are available with several different

wake-up sources to reactivate the device. Two analog / digital

inputs can be sensed or used as the wake-up source.

The device is capable of sensing the supply voltage

(VSENSE), the internal chip temperature (CTEMP) as well as

the motor current using an external sense resistor.)

HIGH SIDE DRIVER

One current and temperature protected high side driver

with PWM capability is provided to drive small loads such as

status LED’s or small lamps.

The driver can be configured for periodic sense during low-

power modes.

LOW SIDE DRIVERS

Two current and temperature protected low side

drivers with PWM capability are provided to drive H-

Bridge type relays for power motor applications.

MCU INTERFACE

The 33911 is providing its control and status information

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.

Both low side and both high side driver outputs can be

controlled via the SPI register as well as PWMIN input.

The integrated LIN physical layer interface can be

configured via the SPI register and its communication is

driven through the RXD and TXD device pin.

All internal analog sources are multiplexed to the ANOUT0

pin.

VOLTAGE REGULATOR OUTPUTS

One voltage regulators is implemented on the 33911. The

VDD main regulator output is designed to supply an MCU

with a precise 5V.

LIN PHYSICAL LAYER INTERFACE

The 33911 provides a LIN 2.0 compatible LIN physical

layer interface with selectable slew rate and various

diagnostic features.

MC33911 - Functional Block Diagram

Integrated Supply

Voltage Regulator VDD

High Side Driver

HS1

LIN Physical Layer

Interface

Low Side Drivers

LS1 - LS2

Analog Circuitry

Digital / Analog Input

Voltage & Temperature Sense

Wake-Up

Window Watchdog

Analog Circuitry

MCU Interface and Output Control

Drivers

MCU Interface and Output Control

SPI Interface

Integrated Supply

Reset & IRQ Logic

LIN Interface / Control

Analog Output 0

LS/HS - PWM Control

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