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Auto-detect peripherals in portables

Posted: 16 Feb 2009     Print Version  Bookmark and Share

Keywords:jack  logic circuitry  comparator 

A common feature in most of the electronic devices we use—cell phones, PDAs, notebooks, handheld media players, game systems, etc.—is the provision for connecting external accessories. Such electronic devices usually include a single 3- or 4-connector jack, which can be a stereo headphone jack, a mono headphone jack with microphone input and hook switch, or a stereo headphone jack with microphone/hook-switch combination.

The devices therefore include dedicated logic circuitry—not just to detect the presence of an accessory, but also its type, so the internal control circuitry can adjust accordingly. For that purpose, you can configure a comparator in various ways to provide simple and cost-effective detection of external accessories.

View the PDF document for more information.





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