Document Number: MC33879

Rev. 11.0, 7/2016

NXP Semiconductors

Technical Data

© 2016 NXP B.V.

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 overtemperature

protection.

Features

• Designed to operate 5.5 V < VPWR < 27.5 V

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

• Outputs are current limited (0.6 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)

• Internal reverse battery protection on VPWR

• Loss of ground or supply will not energize loads or damage IC

• Maximum 5.0

μA IPWR standby current at 13 V VPWR

•RDS(ON) of 0.75 Ω at 25 °C typical

• Short-circuit detect and current limit with automatic retry

• Independent overtemperature protection

Figure 1. 33879 simplified application diagram

HIGH-SIDE/ LOW-SIDE SWITCH

EK SUFFIX (PB-FREE)

98ARL10543D

32-PIN SOICW

33879

33879A

Applications

• Solenoids

• Relays

• Actuators

• Stepper motors

• Brush DC motors

• Incandescent lamps

MCU

A0

MOSI

SCLK

CS

MISO

PWM1

PWM2

5.0 V

VPWR

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

VBAT

VBAT

VBAT

High-side Drive

Low-side Drive

H-Bridge Configuration