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Motorola switch IC enables low pin count MCUs

Posted: 17 Mar 2003 ?? ?Print Version ?Bookmark and Share

Keywords:Motorola? semiconductor products sector? mc33993? switch detection ic? switch ic?

The MC33993 multiple switch detection interface IC from Motorola Inc.'s Semiconductor Products Sector enables designers of multi-voltage embedded systems to eliminate discrete and standard linear ICs to enable low pin count microcontrollers.

Available as a 32-lead SOIC, the chip interfaces with an MCU through a four-pin SPI to increase MCU I/O signals by more than five times. Also, by using the analog multiplex feature of the device, up to 22 analog signals may be sent to one MCU ADC input.

Its 22 I/O pins maybe configured to detect the status of a switch contact, provide an analog value to a buffered output, drive a LED or FET, or provide switched power to a low current sensor. The device is also designed to allow logic-level MCUs to directly interface with system voltages from -14V to 26V, enabling it to be used in automotive, industrial, and commercial applications.

Manufactured using the company's SMARTMOS process, the MC33993 provides 16mA of output current and has a sleep mode for low current consumption. It also has a timer for wake up functions and is protected against ESD of up to 2.5kV.

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