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Hardware Reference Manual for i.MX53 Quick Start
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5.11. Audio  
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The ? main ? Audio ? CODEC ? used ? on ? the ? Quick ? Start ? board ? is ? the ? Freescale ? SGTL5000 ? Low ? Power ? Stereo ?
Codec ? with ? Headphone ? Amp. ? The ? i.MX53 ? Applications ? Processor ? provides ? digital ? sound ? information ?
from ? the ? AUDMUX ? module ? channel ? 5 ? port ? via ? I2S ? communications ? protocol. ? The ? Audio ? CODEC ? also ?
receives ? command ? instructions ? from ? the ? I2C ? channel ? 2 ? bus ? and ? receives ? a ? 24 ? MHz ? clock ? input ? signal ?
from ? GPIO_0 ? of ? the ? i.MX53 ? processor. ? These ? seven ? connections ? with ? the ? processor ? are ? the ? only ? required ?
signals. ?
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The ? Audio ? CODEC ? provides ? a ? Left ? and ? Right ? Stereo ? output ? signal ? capable ? of ? providing ? a ? 16 ? Ohm ? set ? of ?
headphones/earbuds ? with ? up ? to ? 58 ? mW ? of ? power. ? The ? Audio ? CODEC ? is ? also ? capable ? of ? receiving ? a ? single ?
microphone ? channel, ? and ? converting ? the ? information ? to ? a ? digital ? format ? and ? transmitting ? it ? back ? to ? the ?
processor. ? The ? CODEC ? also ? generates ? the ? necessary ? microphone ? bias ? voltage ? to ? allow ? proper ? condenser ?
operation. ?
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The ? Quick ? Start ? board ? was ? designed ? to ? be ? used ? with ? a ? range ? of ? microphone ? options, ? including ? the ? mono ‐
microphone/earbud ? sets ? commonly ? used ? with ? cellular ? phones. ? For ? this ? reason, ? the ? microphone ? bias ?
voltage ? is ? connected ? to ? the ? microphone ? input ? signal ? on ? the ? Quick ? Start ? board, ? rather ? than ? connecting ?
the ? bias ? voltage ? signal ? to ? a ? separate ? channel ? on ? the ? Microphone ? Jack ? (J6) ? and ? allowing ? a ? higher ? end ?
microphone ? to ? connect ? the ? bias ? source ? closer ? to ? the ? connector. ? In ? addition, ? the ? right ? channel ? audio ?
output ? of ? the ? Audio ? CODEC ? can ? be ? sent ? to ? the ? Microphone ? Jack. ? The ? Quick ? Start ? board ? does ? not ? come ?
with ? this ? feature ? by ? default, ? but ? the ? developer ? can ? easily ? populate ? the ? L22 ? footprint ? with ? a ? ferrite ? bead ?
or ? a ? zero ? Ohm ? jumper. ?
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The ? Quick ? Start ? board ? is ? also ? designed ? with ? a ? cable ? detect ? feature ? on ? both ? the ? Headphone ? and ?
Microphone ? Jacks. ? One ? option ? would ? be ? to ? use ? an ? audio ? connector ? with ? an ? internal ? flag ? that ? would ?
make ? or ? break ? depending ? on ? whether ? the ? connector ? barrel ? was ? inserted ? into ? the ? jack. ? These ? connectors ?
are ? available, ? but ? are ? often ? more ? expensive ? and ? may ? have ? supply ? problems. ? On ? the ? Quick ? Start ? board, ? a ?
four ? pin, ? Audio/Video ? style ? connector ? was ? chosen ? to ? implement ? the ? cable ? detect ? feature. ? When ? a ? three ?
connector ? cable ? is ? inserted ? into ? the ? connector, ? the ? cable ? detect ? pin ? is ? shorted ? to ? the ? ground ? pin, ? sending ?
an ? active ? low ? signal ? back ? to ? the ? processor ? to ? indicate ? that ? a ? cable ? was ? inserted. ? For ? this ? reason, ? the ?
ground ? pin ? on ? the ? Microphone ? and ? Headphone ? Jacks ? must ? be ? system ? ground ? and ? not ? a ? virtual ? audio ?
ground. ? Therefore, ? the ? Audio ? CODEC ? was ? designed ? to ? use ? the ? AC ? Coupled ? audio ? mode ? which ? makes ? use ?
of ? two ? 220uF ? capacitors. ? If ? the ? developer ? wishes ? to ? design ? a ? board ? that ? uses ? a ? flagged ? jack ? for ? cable ?
detection ? or ? does ? not ? implement ? a ? cable ? detection ? scheme, ? it ? would ? then ? be ? possible ? to ? use ? the ? Direct ?
Drive ? feature ? of ? the ? Audio ? CODEC ? and ? eliminate ? the ? need ? for ? the ? large ? capacitors. ?
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The ? Audio ? CODEC ? can ? be ? reset ? by ? software ? via ? the ? I2C ? channel, ? but ? there ? is ? no ? hardware ? reset ? pin ? on ?
the ? CODEC. ? Should ? I2C ? communications ? be ? lost ? between ? the ? Audio ? CODEC ? and ? the ? Processor, ? it ? may ? be ?
necessary ? to ? shutdown ? DCDC_3V2 ? power ? to ? the ? Quick ? Start ? board ? and ? reinitialize ? the ? Audio ? CODEC ? by ?
the ? power ? on ? sequence. ?
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Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
57
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