33989 datasheet(18/66 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33989

FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The 33989 is an integrated circuit dedicated to automotive

applications. Its functions include:

• One full protected voltage regulator with 200 mA total

output current capability available at VDD1 external pin

• Driver for an external path transistor for the V2 regulator

function

• Reset, programmable watchdog function, interrupt, and

four operational modes

• Programmable wake-up input and Cyclic Sense wake-up

• CAN high-speed physical interface

FUNCTIONAL PIN DESCRIPTION

RECEIVE AND TRANSMIT DATA (RXD AND TXD)

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

respectively) are connected to a microcontroller’s CAN

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

CANL line state (dominant when TXD is LOW, recessive

when TXD is HIGH). RXD is an output and reports the bus

state (RXD LOW when CAN bus is dominant, HIGH when

CAN bus is recessive).

VOLTAGE DIGITAL DRAIN 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 VDD1 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

µs typical

pulse when the device is in Stop mode.

VOLTAGE SOURCE 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 VDD1

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

case, the V2CTRL pin must be left open.

VOLTAGE SOURCE 2 CONTROL (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 ONE (HS1)

The HS1 pin is the internal high-side driver output. It is

internally protected against overcurrent and

overtemperature.

LEVEL 0-3 INPUTS (L0:L3)

The L0:L3 pins can be connected to contact switches or

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

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

events for the SBC when operating in the Sleep or Stop

mode.

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 TX input level, and the

state of CANH and CANL is reported through RX output. A

Ω termination resistor is connected between CANH and

CANL pins.

SYSTEM CLOCK (SCLK)

SCLK is the System Clock input pin of the serial peripheral

interface.

MASTER IN SLAVE OUT (MISO)

MISO is the Master In Slave Out pin of the serial peripheral

interface. Data is sent from the SBC to the microcontroller

through the MISO pin.

33989 Datasheet(PDF) 18 Page - Freescale Semiconductor, Inc

33989 Datasheet(HTML) 18 Page - Freescale Semiconductor, Inc

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