33889 datasheet(24/60 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33889

FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The MC33889 is an integrated circuit dedicated to

automotive applications. It includes the following functions:

• One full protected voltage regulator with 200 mA total

output current capability.

• Driver for external path transistor for V2 regulator function.

• Reset, programmable watchdog function

• Four operational modes

• Wake-up capabilities: Forced wake-up, cyclic sense and

wake-up inputs, CAN and the SPI

• Can low speed fault tolerant physical interface.

FUNCTIONAL PIN DESCRIPTION

RECEIVE AND TRANSMIT DATA (RX AND TX)

The RX and TX pins (receive data and transmit data pins,

respectively) are connected to a microcontroller’s CAN

protocol handler. TX is an input and controls the CANH and

CANL line state (dominant when TX is LOW, recessive when

TX is HIGH). RX is an output and reports the bus state (RX

LOW when CAN bus is dominant, HIGH when CAN bus is

recessive).

VOLTAGE REGULATOR ONE (VDD1)

The VDD1 pin is the output pin of the 5.0 V internal

regulator. It can deliver up to 200 mA. This output is protected

against overcurrent and overtemperature. It includes an

overtemperature pre-warning flag, which is set when the

internal regulator temperature exceeds 130°C typical. When

the temperature exceeds the overtemperature shutdown

(170°C typical), the regulator is turned off. VDD1 includes an

undervoltage reset circuitry, which sets the RST pin LOW

when VDD is below the undervoltage reset threshold.

RESET (RST)

The Reset pin RST is an output that is set LOW when the

device is in reset mode. The RST pin is set HIGH when the

device is not in reset mode. RST includes an internal pullup

current source. When RST is LOW, the sink current capability

is limited, allowing RST to be shorted to 5.0 V for software

debug or software download purposes.

INTERRUPT (INT)

The Interrupt pin INT is an output that is set LOW when an

interrupt occurs. INT is enabled using the Interrupt Register

(INTR). When an interrupt occurs, INT stays LOW until the

interrupt source is cleared. INT output also reports a wake-up

event by a 10 sec. typical pulse when the device is in Stop

mode.

GROUND (GND)

This pin is the ground of the integrated circuit.

V2CTRL (V2CTRL)

The V2CTRL pin is the output drive pin for the V2 regulator

connected to the external series pass transistor.

VOLTAGE SUPPLY (VSUP)

The VSUP pin is the battery supply input of the device.

HIGH-SIDE OUTPUT 1 (HS1)

The HS pin is the internal high-side driver output. It is

internally protected against overcurrent and

overtemperature.

LEVEL 0-1 INPUTS (L0: L1)

The L0: L1 pins can be connected to contact switches or

the output of other ICs for external inputs. The input states

can be read by the SPI. These inputs can be used as wake-

up events for the SBC when operating in the Sleep or Stop

mode.

VOLTAGE REGULATOR TWO (V2)

The V2 pin is the input sense for the V2 regulator. It is

connected to the external series pass transistor. V2 is also

the 5.0 V supply of the internal CAN interface. It is possible to

connect V2 to an external 5.0 V regulator or to the VDD

output when no external series pass transistor is used. In this

case, the V2CTRL pin must be left open.

RTH (RTH)

Pin for the connection of the bus termination resistor to

CANH

RTL (RTL)

Pin for the connection of the bus termination resistor to

CANL

CAN HIGH AND CAN LOW OUTPUTS

(CANH AND CANL)

The CAN High and CAN Low pins are the interfaces to the

CAN bus lines. They are controlled by TXD input level, and

the state of CANH and CANL is reported through RXD output.

SYSTEM CLOCK (SCLK)

SCLK is the Serial Data Clock input pin of the serial

peripheral interface.

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