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NXP board turns audio jack into plug-and-play interface

Posted: 29 May 2014 ?? ?Print Version ?Bookmark and Share

Keywords:audio jack? 3.5mm jack? smartphone? plug-and-play?

An energy harvesting IC utilises the right audio channel to draw power. A constant stream of audio feeds the IC, which then boosts the low-voltage AC signal from the audio-jack to a DC-voltage suitable for digital circuitry.

The MCU automatically identifies microphone and ground, for quick and easy operation. The energy-harvesting IC outputs a 21.3kHz sine waveform, rectifying the signal and generates a DC output. While the board operates solely from the power supplied by the smartphone, it can also use a button battery for power when the phone is not available.

With an IR transmitter, the board can turn the phone into a universal remote control for use with TVs,

DVDs, and stereo amplifiers. It can also be used to connect several input devices to the phone including keyboards, mice, and joysticks.

Quick-jack hardware

Figure 2: The quick-jack hardware block diagram.

The company suggested a portable weather station as one practical application for the board, where temperature and humidity readings can be recorded and subsequently reported to the cloud. Similar functions can be used for inventory management, when transporting or storing items that need controlled levels of humidity or temperature.

"Smartphone user interfaces and connectivity features have revolutionized personal communication. The new Smartphone Quick-Jack Solution makes it exceptionally easy to take advantage of those same appealing features when designing end products, from something as sophisticated as a portable air-quality monitor, to something as rewarding as a child's toy with changeable/uploadable features," said Jim Trent, VP and GM of business line microcontrollers at NXP Semiconductors.

The flexible Smartphone Quick-Jack Solution turns the standard 3.5 mm stereo audio jack on popular smartphones into a simple, self-powered data port for easy connection of external sensors, switches, and peripherals. Source: NXP

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