33689D datasheet(19/31 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33689

FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

A System Basis Chip (SBC) is a monolithic IC combining

many functions found in standard microcontroller-based

systems; e.g., power management, communication interface,

system protection, and diagnostics.

The 33689 is a SPI-controlled SBC combining many

functions with a LIN transceiver for slave node applications.

The 33689 has a 5.0 V, 50 mA regulator with undervoltage

reset, output current limiting, overtemperature pre-warning,

and thermal shutdown. An externally selectable timing

Window Watchdog is also included.

The LIN transceiver has waveshaping that can be disabled

when high data rates are warranted. A single 50 mA and two

150 mA fully protected high-side switches with output

clamping are available for switching inductive or resistive

loads. The 150 mA switches are PWM capable.

Two high-voltage inputs can be used to monitor switches

or provide external wake-up. An internal current sense

operational amplifier is available for load current monitoring.

FUNCTIONAL PIN DESCRIPTION

LEVEL 1 AND LEVEL 2 INPUT PINS

(L1 AND L2)

These pins are used to sense external switches and to

wake up the 33689 from Sleep or Stop mode. During Normal

mode, the state of these pins can be read through the SPI

HIGH-SIDE DRIVER OUTPUT PINS 1 AND 2 (HS1

AND HS2)

These two high-side switches are able to drive loads such

as relays or lamps. They are protected against overcurrent

and overtemperature and include internal clamp circuitry for

inductive load protection. Switch control is done through

selecting the correct bit in the SPI Register. HS1 and HS2

can be PWM-ed if required through the IN input pin. The

internal circuitry that drives both high-side switches is an

AND function between the SPI bit HS1 (or HS2) and the IN

input pin.

If no PWM control is required, the IN pin must be

connected to the VDD pin.

HIGH-SIDE DRIVER OUTPUT PIN 3 (HS3)

This high-side switch can be used to drive small lamps,

Hall sensors, or switch pullup resistors. Control is done

through the SPI Register only.

No direct PWM control is possible on this pin.

This high-side switch features current limit to protect it

against overcurrent and short circuit conditions. It is also

protected against overtemperature.

VOLTAGE SUPPLY PINS 1 AND 2

(VS1 AND VS2)

The 33689 is supplied from a battery line or other supply

source through the VS1 and VS2 pins. An external diode is

required to protect against negative transients and reverse

battery. The 33689 can operate from 4.5 V and under the

jump start condition at 27 V DC. Device functionality is

guaranteed down to 4.5 V at VS1 and VS2 pins. These pins

sustain standard automotive voltage conditions such as load

dump at 40 V.

LIN BUS PIN (LIN)

The LIN pin represents the single-wire bus transmitter and

receiver. It is suited for automotive bus systems and is based

on the LIN bus specification.

VOLTAGE SOURCE PIN (VDD)

The VDD pin is the 5.0 V supply pin for the MCU and the

current sense operational amplifier.

CURRENT SENSE OPERATIONAL AMPLIFIER

PINS (E+, E

-, VCC, AND OUT)

These are the pins of the single-supply current sense

operational amplifier.

• The E+ and the E- input pins are the non-inverting and

inverting inputs of the current sense operational amplifier,

respectively.

• The OUT pin is the output pin of the current sense

operational amplifier.

• The VCC pin is the +5.0 V single-supply connection for the

current sense operational amplifier.

The current sense operational amplifier is enabled in

Normal mode only.

WATCHDOG CONFIGURATION PIN (WDC)

The WDC pin is the configuration pin for the internal

watchdog. A resistor is connected to this pin. The resistor

value defines the watchdog period. If the pin is left open, the

watchdog period is fixed to its default value (150 ms typical).

If no watchdog function is required, the WDC pin must be

connected to GND.

33689D Datasheet(PDF) 19 Page - Freescale Semiconductor, Inc

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