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Technical Data
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
? Designed to operate 5.5 V < V PWR < 26.5 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
Document Number: MC33879
Rev. 10.0, 6/2012
33879
33879A
HIGH SIDE/ LOW SIDE SWITCH
EK SUFFIX (PB-FREE)
98ARL10543D
32-PIN SOICW
ORDERING INFORMATION
? 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 V PWR
? Loss of ground or supply will not energize loads or damage IC
? Maximum 5.0 ? A I PWR standby current at 13 V V PWR
? R DS(ON) of 0.75 ? at 25 ? C typical
Device
(For Tape and Reel,
add an R2 Suffix)
MC33879APEK
MC33879TEK
Temperature
Range (T A )
-40 ? to 125 ? C
Package
32 SOICW-EP
? Short-circuit detect and current limit with automatic retry
? Independent over-temperature protection
5.0 V
V PWR
33879
V BAT
MCU
A0
VPWR
VDD
EN
D1
D2
D3
D4
S1
S2
S3
High Side Drive
MOSI
SCLK
CS
MISO
PWM1
PWM2
DI
SCLK
CS
D0
IN5
IN6
GND
S4
D5
D6
D7
D8
S5
S6
S7
S8
M
H-Bridge Configuration
V BAT V BAT
Low Side Drive
Figure 1. 33879 Simplified Application Diagram
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., 2009-2012. All rights reserved.
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