Freescale Semiconductor, Inc. reserves the right to change the detail specifications,

as may be required, to permit improvements in the design of its products.

Document Number: MC33879

Rev. 9.0, 5/2012

Freescale Semiconductor

Technical Data

© Freescale Semiconductor, Inc., 2009-2012. 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 using the serial peripheral

interface (SPI). Two of the outputs may be controlled directly via a

microcontroller for pulse-width modulation (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, 3.3 V/5.0 V compatible

• Outputs are current limited (0.6 A to 1.2 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

μA I

• Short-circuit detect and current limit with automatic retry

• Independent over-temperature protection

Figure 1. 33879 Simplified Application Diagram

HIGH SIDE/ LOW SIDE SWITCH

EK SUFFIX (PB-FREE)

98ARL10543D

32-PIN SOICW

33879

33879A

ORDERING INFORMATION

Device

(For Tape and Reel,

add an R2 Suffix)

Temperature

Package

MC33879APEK

-40

32 SOICW-EP

MC33879TEK

MCU

A0

MOSI

SCLK

CS

MISO

PWM1

PWM2

5.0 V

33879

VDD

VPWR

EN

DI

SCLK

D0

IN5

IN6

GND

D1

D2

D3

D4

S1

S2

S3

S4

D5

D6

D7

D8

S5

S6

S7

S8

M

CS

High Side Drive

Low Side Drive

H-Bridge Configuration