Document Number: MC33879
Rev 7, 8/2008
Freescale Semiconductor
Advance Information
Configurable Octal Serial Switch
with Open Load Detect Current
Disable
33879
33879A
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.
HIGH SIDE/ LOW SIDE SWITCH
Features
DWB SUFFIX EXPOSED PAD
EK SUFFIX (PB-FREE)
98ARL10543D
• Designed to operate 5.5V < VPWR < 26.5V
• 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
32-PIN SOICW
ORDERING INFORMATION
Temperature
• Output voltage clamp, +45V (Low Side) and -20V (High Side)
during inductive switching
Device
Package
• 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 5.0μA IPWR standby current at 13V VPWR
• RDS(ON) of 0.75Ω at 25°C typical
Range (T )
A
MC33879EK/R2
MCZ33879EK/R2
MCZ33879AEK/R2
-40°C to 125°C
32 SOICW-EP
• Short-circuit detect and current limit with automatic retry
• Independent over-temperature protection
• Pb-free packaging designated by suffix code EK
V
PWR
V
BAT
+5.0 V
33879
VDD VPWR
D1
D2
D3
D4
S1
S2
S3
S4
MCU
A0
EN
DI
SCLK
CS
High-Side Drive
MOSI
SCLK
CS
MISO
PWM1
PWM2
DO
H-Bridge Configuration
V
M
IN5
IN6
D5
D6
D7
D8
S5
S6
S7
S8
BAT
V
BAT
Low-Side Drive
GND
Figure 1. 33879 Simplified Application Diagram
* 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.