33910 datasheet(68/90 Pages) FREESCALE

68 / 90 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

33910

FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

MC33910BAC / MC34910BAC

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

Figure 35. Functional Internal Block Diagram

ANALOG CIRCUITRY

The 33910 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. One analog / digital

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

device is capable of sensing the supply voltage (VSENSE)

and the internal chip temperature (CTEMP).

HIGH SIDE DRIVERS

Two current and temperature protected High Side drivers

with PWM capability are provided to drive small loads such as

Status LED’s or small lamps. Both Drivers can be configured

for periodic sense during low power modes.

MCU INTERFACE

The 33910 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. The High

Side driver outputs can be controlled via the SPI register as

well as the PWMIN input. The integrated LIN physical layer

interface can be configured via SPI register and its

communication is driven through the RXD and TXD device

pins. All internal analog sources are multiplexed to the

ADOUT0 pin.

VOLTAGE REGULATOR OUTPUTS

Two independent voltage regulators are implemented on

the 33910. The VDD main regulator output is designed to

supply a MCU with a precise 5.0 V. The switchable HVDD

output is dedicated to supply small peripherals as hall

sensors.

LIN PHYSICAL LAYER INTERFACE

The 33910 provides a LIN 2.0 compatible LIN physical

layer interface with selectable slew rate and various

diagnostic features.

MC33910 - Functional Block Diagram

Analog Circuitry

MCU Interface and Output Control

Drivers

Analog Circuitry

MCU Interface and Output Control

SPI Interface

High Side Drivers

HS1 - HS2

LIN Physical Layer

Interface

Digital / Analog Input

Voltage & Temperature Sense

Wake-Up

Integrated Supply

Hall Sensor Supply

HVDD

Window Watchdog

Voltage Regulator

VDD

Integrated Supply

Reset & IRQ Logic

HS - PWM Control

Analog Output 0

33910 Datasheet(PDF) 68 Page - Freescale Semiconductor, Inc

33910 Datasheet(HTML) 68 Page - Freescale Semiconductor, Inc

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