Simplified Application Diagram

VBAT

M

VBAT

VPWR

33879

Low-Side Drive

GND

S3

S4

D1

D2

D3

D4

S1

S2

D5

D6

D7

D8

S7

S8

S5

S6

EN

DI

SCLK

CS

DO

IN5

IN6

MCU

A0

MOSI

SCLK

CS

MISO

PWM1

PWM2

VDD VPWR

+5.0 V

H-Bridge Configuration

VBAT

High-Side Drive

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

This document contains information on a product under development.

Motorola reserves the right to change or discontinue this product without notice.

© Motorola, Inc. 2004

Document order number: MC33879

Rev 3.0, 06/2004

33879

Preliminary Information

33879 Simplified Application Diagram

Configurable Octal Serial Switch

with Open Load Detect Current

Disable

The 33879 device is an 8-output hardware-configurable, high-side/low-side

switch with 16-bit serial input control. Two of the outputs may be controlled

directly via microprocessor for PWM applications. The 33879 incorporates

SMARTMOS technology, with CMOS logic, bipolar/MOS analog circuitry, and

DMOS power MOSFETs. The 33879 controls various inductive, incandescent,

or LED loads by directly interfacing with a microcontroller. The circuit’s

innovative monitoring and protection features include very low standby

currents, cascade fault reporting, internal +45 V clamp voltage for low-side

configuration, -20 V high-side configuration, output-specific diagnostics, and

independent overtemperature protection.

Features

• 16-Bit SPI for Control and Fault Reporting, 3.3 V/5.0 V Compatible

• Outputs Are Current Limited (0.5 A to 1.0 A) to Drive Incandescent

Lamps

• Output Voltage Clamp, +45 V (Low Side) and -20 V (High Side) During

Inductive Switching

• On/Off Control of Open Load Detect Current (LED Application)

• Loss of Ground or Supply Will Not Energize Loads or Damage IC

• Maximum 5.0

• Short Circuit Detect and Current Limit with Automatic Retry

• Independent Overtemperature Protection

• Motorola Now Offers Pb-Free Packaging with the Suffix EK

CONFIGURABLE OCTAL SERIAL

SWITCH WITH OPEN LOAD

DETECT CURRENT DISABLE

EK (Pb-FREE) SUFFIX

DWB SUFFIX

CASE 1437-01

32-LEAD SOICW-EP

ORDERING INFORMATION

Device

Temperature

Package

PC33879DWB/R2

-40

32 SOICW-EP

PC33879EK/R2

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com