Freescale Semiconductor
Advance Information
Document Number: MC33879
Rev 7, 8/2008
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
• Designed to operate 5.5V < V
PWR
< 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
• Output voltage clamp, + 45V (Low Side) and - 20V (High Side)
during inductive switching
• On/Off control of open load detect current (LED application)
• Internal reverse battery protection on V
PWR
• Loss of ground or supply will not energize loads or damage IC
• Maximum 5.0μA I
PWR
standby current at 13V V
PWR
• R
DS(ON)
of 0.75Ω at 25°C typical
• Short-circuit detect and current limit with automatic retry
• Independent over-temperature protection
• Pb-free packaging designated by suffix code EK
VPWR
+5.0 V
33879
33879A
HIGH SIDE/ LOW SIDE SWITCH
DWB SUFFIX EXPOSED PAD
EK SUFFIX (PB-FREE)
98ARL10543D
32-PIN SOICW
ORDERING INFORMATION
Device
MC33879EK/R2
MCZ33879EK/R2
MCZ33879AEK/R2
-40
°
C to 125
°
C
32 SOICW-EP
Temperature
Range (T
A
)
Package
33879
VDD VPWR
EN
DI
SCLK
CS
DO
IN5
IN6
D1
D2
D3
D4
S1
S2
S3
S4
VBAT
MCU
A0
MOSI
SCLK
CS
MISO
PWM1
PWM2
High-Side Drive
M
D5
D6
D7
D8
S5
S6
S7
S8
H-Bridge Configuration
VBAT
VBAT
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.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
