Document Number: MC33879

Rev 7, 8/2008

Freescale Semiconductor

Advance Information

* This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

© Freescale Semiconductor, Inc., 2007-2008. All rights reserved.

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 over-temperature protection.

Features

• 16-Bit SPI for control and fault reporting, 3.3V/5.0V compatible

• Outputs are current limited (0.6A to 1.2A) to drive incandescent

lamps

• Output voltage clamp, +45V (Low Side) and -20V (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

μA I

• Short-circuit detect and current limit with automatic retry

• Independent over-temperature protection

• Pb-free packaging designated by suffix code EK

Figure 1. 33879 Simplified Application Diagram

HIGH SIDE/ LOW SIDE SWITCH

DWB SUFFIX EXPOSED PAD

EK SUFFIX (PB-FREE)

98ARL10543D

32-PIN SOICW

33879

33879A

ORDERING INFORMATION

Device

Temperature

Package

MC33879EK/R2

-40

32 SOICW-EP

MCZ33879EK/R2

MCZ33879AEK/R2

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