MOTOROLA 33879 Data Sheet
Summary
This professional octal serial switch is an advanced hardware solution for controlling eight power loads—including inductive, incandescent, or LED devices—directly from a microcontroller. Featuring 16-bit SPI control and integrated fault protection, it provides configurable high/low-side switching and supports PWM applications. The accompanying manual details the product's sophisticated electronics, pin functions, circuit schematics, and performance specifications, making it essential for embedded systems engineers developing reliable power management or load-switching equipment.
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查询PC33879DWB/R2供应商
Freescale Semiconductor, Inc.
MOTOROLA Document order number: MC33879
Rev 3.0, 06/2004
SEMICONDUCTOR TECHNICAL DATA
Preliminary Information
Configurable Octal Serial Switch with Open Load Detect Current
CONFIGURABLE OCTAL SERIAL
Disable
SWITCH WITH OPEN LOAD
The 33879 device is an 8-output hardware-configurable, high-side/low-side
DETECT CURRENT DISABLE
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 circuits 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 < 26.5 V EK (Pb-FREE) SUFFIX DWB SUFFIX
16-Bit SPI for Control and Fault Reporting, 3.3 V/5.0 V Compatible
CASE 1437-01
Outputs Are Current Limited (0.5 A to 1.0 A) to Drive Incandescent 32-LEAD SOICW-EP Lamps Output Voltage Clamp, +45 V (Low Side) and -20 V (High Side) During Inductive Switching ORDERING INFORMATION On/Off Control of Open Load Detect Current (LED Application)
Temperature
Device Package
Internal Reverse Battery Protection on VPWR Range (TA) Loss of Ground or Supply Will Not Energize Loads or Damage IC
PC33879DWB/R2
Maximum 5.0 µA IPWR Standby Current at 13.0 V VPWR -40°C to 125°C 32 SOICW-EP
PC33879EK/R2
RDS(ON) of 1.0 Ω at 25°C Typical Short Circuit Detect and Current Limit with Automatic Retry Independent Overtemperature Protection Motorola Now Offers Pb-Free Packaging with the Suffix EK
33879 i Simplified Application Diagram plified Application Diagram VPWR
MCU VDD VPWR D1 D2 D3
A0 EN D4
High-Side Drive
MOSI DI S1 S2
SCLK SCLK
CS CS
MISO DO
H-Bridge Configuration
PWM1 IN5
D5 VBAT
PWM2 IN6 D6 D7 D8
S5 Low-Side Drive
GND S6 S7 S8
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
For More Information On This Product,
© Motorola, Inc. 2004
Go to: www.freescale.com
Page Summary Contents For MOTOROLA 33879 Data Sheet
Manual Details
| Brand | Motorola |
|---|---|
| Pages | 21 |
| File Size | 397.52 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
How is the MC3379 device primarily controlled?
It uses a 16-bit SPI interface for serial input control, and two outputs can also be controlled directly via PWM using dedicated pins IN5 and IN6.
What is the maximum standby current draw?
The maximum standby current specified for this device is 5.0 µA at 13.0 V.
What types of loads can this module handle?
It controls inductive, incandescent, or LED loads, and features current limiting between 0.5 A to 1.0 A.
What protective functions are built into the circuit?
The device includes independent overtemperature protection, open load detection, and internal clamps (+45 V low side / -20 V high side).