33742 datasheet(25/70 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33742

FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

OUTPUTS

5.0V LINEAR REGULATOR (LDO)

This low dropout linear regulator (V1) outputs a regulated

5.0V at 200mA. The associated monitoring circuit provides

detection of under-voltage, over-current, and short-circuit

conditions, as well as over-temperature and a reset function.

5.0V REGULATOR BASE PNP DRIVE

The V2 linear regulator control circuitry provides drive for

an external series pass transistor (PNP type). The 5.0V

output tracks the V1 regulator

HIGH SIDE SWITCH

The high switch provides a 2.0 Ohm (typ.) RDSON

MOSFET driver connected to the VSUP pin. The output is

protected against short-circuit conditions and provides over-

temperature shutdown.

CAN PHYSICAL LAYER INTERFACE

This circuitry provides communication between the TXD &

RXD pins, from/to the MCU, and the CANL & CANH pins of

the CAN physical interface. The various modes of the CAN

interface are controlled through the SPI control registers.

INTEGRATED SUPPLY

VSUP CONTROL & MONITOR

This circuitry protects the IC from transient conditions such

as vehicle jump-start (27V) and load dump (40V). If the VSUP

voltage falls below 3.0V (or a 6.0V warning interrupt), an

under-voltage detection is reported.

ANALOG CIRCUITRY

OSCILLATOR

This circuit is used to generate the internal timings for

reset, watchdog, cyclic wake-up, filtering time, etc.

MODE CONTROL

The 4 operating modes of the IC are controlled through the

SPI control registers. There are also several special modes

possible.

PROGRAMMABLE WAKE-UP

The 4 inputs are used in conjunction with various SPI

control register bits to determine the wake-up conditions and

the reaction of the IC. They can be connected to contact

switches or other ICs.

MC33742 - Functional Block Diagram

Analog Circuitry

MCU Interface

Outputs

Integrated Supply

VSUP Control & Monitor

Analog Circuitry

Mode Control

MCU Interface

SPI Interface

CAN Interface / Control

Reset & INT

Outputs

CAN Physical Layer

Interface

5.0V Linear

Regulator (LDO)

High-side

Switch

5.0V Regulator

Base PNP Drive

Oscillator

Watchdog Timer

Programmable Wake-up

33742 Datasheet(PDF) 25 Page - Freescale Semiconductor, Inc

33742 Datasheet(HTML) 25 Page - Freescale Semiconductor, Inc

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