Document Number: MC33291

Rev 5, 07/2008

Freescale Semiconductor

Technical Data

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

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

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

Eight-Output Switch with Serial

Peripheral Interface I/O

The 33291 device is an eight-output, low-side power switch with 8-

bit serial input control. The 33291 is a versatile circuit designed for

automotive applications, but is well suited for other environments. The

33291 incorporates SMARTMOS technology, with CMOS logic,

bipolar/MOS analog circuitry, and DMOS power MOSFETs. The 33291

interfaces directly with a microcontroller to control various inductive or

incandescent loads.

The circuit’s innovative monitoring and protection features include

very low standby current, SPI cascade fault reporting capability,

internal 53 V clamp on each output, output-specific diagnostics, and

independent shutdown of outputs.

The device is parametrically specified over an ambient temperature

range of -40

Features

• Designed to Operate Over Wide Supply Voltages of 5.5 V to 26.5 V

• Interfaces to Microprocessor Using 8-Bit SPI I/O Protocol up to 3.0

MHz

150

°C

• Outputs Current-Limited to Accommodate In-Rush Currents

Associated with Switching Incandescent Loads

• Output Voltages Clamped to 53 V During Inductive Switching

• Pb-Free Packaging Designated by Suffix Code EG

Figure 1. 33291 Simplified Application Schematic

LOW-SIDE SWITCH

DW SUFFIX

EG SUFFIX (PB-FREE)

98ASB42344B

24-PIN SOICW

33291

ORDERING INFORMATION

Device

Temperature

Package

MC33291DW/R2

-40

24 SOICW

MCZ33291EG/R2

MCU

33291

VDD

V PWR

SFPD

CS

SCLK

SI

RESET

SO

VDD

VPWR

OP 0

OP 1

OP 2

OP 3

OP 4

OP 5

OP 6

OP 7

GND