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Octal serial switches suit car body electronics

Posted: 20 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:serial switch? switches? automotive? Freescale? octal serial switch?

Freescale Semiconductor has introduced a family of advanced octal serial switch ICs designed to manage multiple high-side loads, reduce board space and enhance automotive electronics system reliability. The MC338xx and MC3399x switch ICs promise enhanced load control capability to designers of automotive driver instrumentation, body control modules and other in-vehicle electronics applications.

As body control module capabilities grow more sophisticated, automotive designers must develop electronic systems that can detect a variety of vehicle conditions and act quickly to control multiple loads across a wide range of body applications. Freescale said its octal serial switch IC family provides the control flexibility designers need. The family is designed to control low-current on/off type inductive loads, such as relays and solenoids, as well as LED indicators and small lamps with integral thermal and overvoltage, overcurrent protection.

The MC338xx and MC3399x devices reduce the number of necessary components and simplify body electronics designs, the company said, providing flexibility, load protection and weight and size savings. Interior lighting control application solutions have typically employed multiple load-carrying switches (one switch for each lamp) or use discrete semiconductor power devices to power each lamp. Another common body application, power door locks, uses multiple electrical power door lock solenoids (one for each passenger door).

Device protection
These octal serial switch family features multiple high-side and low-side drivers with diagnostic capability, integral device protection including over-temperature protection and over- and undervoltage protection, wide operating voltage range of 5-25V, load current capability of up to 2.5A per channel peak current, low quiescent and standby current, cost-effective 32- and 54-pin SOIC packages and operation within automotive temperatures of -40C to 125C.

These devices are currently available in production quantities. Suggested per-unit resale pricing in 10,000-piece quantities for the MC33879 8-channel single octal serial switch is $1.83; for the MC33880 8-channel single octal serial switch it's $2.01; for the MC33996 16-channel dual octal serial switch it's $2.75; and for the MC33999 16-channel dual octal serial switch it's $3.48.

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